Mechanics

P0320 99 WON'T START WHEN HOT

1999 Ford Windstar

Engine Performance problem
1999 Ford Windstar 6 cyl Front Wheel Drive Automatic 200000 miles

I have a 99 windstar. It will die while driving as if the ignition key was turned off. It did bring on the check engine light with a P0320 code. It will start up and run again after I wait 2-3 hrs for the whole engine to cool down, then it might die again after 5 miles of driving. I erased the code after I installed a new crankshaft sensor. It ran fine for a day then it all happened over again without bringing on the code this time. Next I changed the coil pack. It ran again, but now is still dying out while driving down the road and won't start unless it is allowed to cool down for 2-3 hours. The code has not came back after the first time.
Avatar
Szalkuskt
December 17, 2008.



Continuous Memory DTC P0320
This DTC indicates that (2) successive erratic Profile Ignition Pulses (PIP) have occurred. Possible causes are:
Loose wires and/or connectors.
Short circuit to ground in ignition secondary system.
Incorrect 2-way radio installation.
If any of the specified causes were present, repair as necessary. If vehicle will not start, go to TEST A. If fault is intermittent, go to TEST Z. If vehicle will start and none of the specified causes were present, check for missing PIP signal. See TEST JD.

TEST JD: CRANKSHAFT POSITION (CKP) SENSOR
NOTE:After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

Diagnostic Aids
Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following:
Crankshaft Position (CKP) sensor.
CKP wiring harness and connector(s).
Powertrain Control Module (PCM).
Fig. 145: Identifying CKP Sensor Circuits


http://www.2carpros.com/forum/automotive_pictures/266999_ckp3_1.jpg


1) Check CKP+ Circuit To PCM

Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Turn ignition on. Measure voltage between PCM connector pin No. 21 (CKP+) and CKP+ terminal at CKP sensor wiring harness connector. See Fig. 145-Fig. 148 . Also measure resistance between PCM connector pin No. 22 (CKP-) and CKP- terminal at CKP sensor wiring harness connector. If both resistance readings are 5 ohms or less, go to next step. If any resistance reading is more than 5 ohms, repair open circuit.
2) Check For CKP+ Voltage Fault

Reconnect PCM connector. Turn ignition on. Measure voltage between CKP+ terminal at CKP sensor wiring harness connector and negative battery terminal. If voltage is more than one volt, but less than 2 volts, go to next step. If voltage is not as specified, go to step 19).
3) Check For CKP- Voltage Fault

Ensure ignition is on. Measure voltage between CKP- terminal at CKP sensor wiring harness connector and negative battery terminal. If voltage is 1-2 volts, go to step 10). If voltage is not 1-2 volts, go to next step.
4) Determine Fault

If voltage reading in step 3) is less than one volt, go to next step. If voltage reading in step 3) is not less than one volt, go to step 6).
5) Check CKP- Circuit For Short To Ground

Turn ignition off. Disconnect PCM connector. Measure resistance between PCM connector pin No. 22 and negative battery terminal. If resistance is more than 10,000 ohms, replace PCM. If resistance is less than 10,000 ohms, repair CKP- circuit short to ground.
6) Check CKP- Sensor For Short To Power

Disconnect PCM connector. Turn ignition on. Measure voltage between PCM connector pin No. 22 and negative battery terminal. If voltage is .5 volt or more, repair CKP- circuit short to power. If resistance is less than .5 volt, replace PCM.
NOTE:A break in step numbering sequence occurs at this point. Procedure skips from step 6) to step 10). No test procedures have been omitted.

10) Check CKP Sensor Voltage At PCM

Turn ignition off. Reconnect CKP sensor connector. Disconnect PCM connector. While cranking engine, measure voltage between PCM connector pins No. 21 and 22. If A/C voltage stabilized at more than .4 volt, CKP circuit is okay. Go to step 17). If voltage is .4 volt or less, go to next step.
NOTE:A break in step numbering sequence occurs at this point. Procedure skips from step 10) to step 12). No test procedures have been omitted.

12) Check CKP Circuit Resistance

Turn ignition off. Measure resistance between PCM connector pins No. 21 and 22. If resistance is 300-800 ohms, go to step 16). If resistance is not 300-800 ohms, go to next step.
13) Determine Fault

If resistance is less than 300 ohms in step 12) , go to next step. If resistance is not less than 300 ohms in step 12) , replace CKP sensor.
14) Check For Open Circuit

Disconnect CKP sensor connector. Measure resistance between CKP sensor wiring harness connector terminals. If resistance is less than 5 ohms, repair CKP+ to CKP- short circuit. If resistance is 5 ohms or more, replace CKP sensor.
NOTE:A break in step numbering sequence occurs at this point. Procedure skips from step 14) to step 16). No test procedures have been omitted.

16) Check CKP Sensor & Trigger Wheel

Check CKP sensor and trigger wheel for damage. Repair as necessary. If CKP sensor and trigger wheel are okay, replace CKP sensor.
17) Check For PCM Fault

Turn ignition off. Disconnect CKP sensor connector. Reconnect PCM connector. Measure resistance between CKP sensor wiring harness connector terminals. If resistance is 16,000-24,000 ohms, go to next step. If resistance is not 16,000-24,000 ohms, replace PCM.
18) Check For Short Circuit

Ensure CKP sensor is disconnected. Disconnect PCM connector. Measure resistance between PCM connector pins No. 21 and 22. If resistance is more than 1000 ohms, replace CKP sensor. If resistance is 1000 ohms or less, repair short circuit.
19) Determine Fault

If voltage reading in step 2) is less than one volt, go to next step. If voltage reading in step 2) is not less than one volt, go to step 21).
20) Check CKP+ Circuit For Short To Ground

Turn ignition off. Disconnect PCM connector. Measure resistance between PCM connector pin 21 and negative battery terminal. If resistance is more than 10,000 ohms, replace PCM. If resistance is less than 10,000 ohms, repair CKP+ circuit short to ground.
21) Check CKP+ Sensor For Short To Power

Turn ignition off. Disconnect PCM connector. Turn ignition on. Measure voltage between PCM connector pin No. 21 and negative battery terminal. If voltage is .5 volt or more, repair CKP+ circuit short to power. If voltage is less than .5 volt, replace PCM.

Dave H
Dec 17, 2008.
Where is the PCM located? If I changed the crankshaft sensor and the coil already what do you think it might be?

Tiny
Szalkuskt
Dec 17, 2008.
Dave H, I will try going through the steps of this troubleshooting. Please help with some more ideas. Can you shoot me explanation of Test A and Test Z?

Tiny
Szalkuskt
Dec 17, 2008.
TEST A: NO-START/VEHICLE WILL NOT START
Tips Click a link to view tip
Tech1Question: NO START, NO PULSE TO INJECTOR

NOTE: After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.

CAUTION: Stop this test at first sign of a fuel leak. DO NOT allow smoking or an open flame in vicinity of vehicle during these tests.

Diagnostic Aids
Enter this test only when all steps under QUICK TEST have been successfully completed and engine still does not start or if directed here from another test or chart. This test is only intended to diagnose: Powertrain Control Module (PCM).
Spark (PCM-controlled).
To prevent replacement of good components, be aware the following non-EEC related areas and components may be cause of problem: Fuel quality and quantity.
Ignition (general condition).
Engine mechanical components.
Starter and battery circuits.
1) Check Anti-Theft System

If vehicle does not have a anti-theft system, go to next step. If vehicle has an anti-theft system, it may be activated causing the no-start condition. Verify be observing anti-theft indicator light on instrument panel or a DTC P1260 may be present. If anti-theft system is not activated, go to next step. If anti-theft system is activated, see appropriate ANTI-THEFT SYSTEMS article in ACCESSORIES & EQUIPMENT for diagnosis and testing.
2) Attempt To Crank Engine

Ensure Inertia Fuel Shutoff (IFS) switch is closed (button pushed in). Try to start engine. If engine does not crank, check vehicle starting and charging systems. Repair as necessary and retest. If engine cranks, go to next step.
3) Check For Intermittent

Attempt to start engine. If engine now starts, fault is intermittent. Go to TEST Z, step 50). If engine does not start, go to TEST HA, step 47) (Natural Gas vehicles) or next step (all others).
4) Check VREF At TP Sensor

Turn ignition off. Disconnect TP sensor. Turn ignition on. Measure voltage between circuits VREF and SIG RTN at TP sensor wiring harness connector. See Fig. 46 or Fig. 47. If voltage is 4-6 volts, reconnect TP sensor connector and go to next step. If voltage is not 4-6 volts, go to TEST C.
Fig. 46: Identifying TP Sensor Circuits & Connector Terminals (Contour 2.0L, Cougar 2.0L & Mystique 2.0L)
Courtesy of FORD MOTOR CO.
Fig. 47: Identifying TP Sensor Circuits & Connector Terminals (Except Contour 2.0L, Cougar 2.0L & Mystique 2.0L)
Courtesy of FORD MOTOR CO.
5) Check Flash EPROM (FEPS) Circuit For Short To Power

Measure voltage between ground and DLC terminal No. 13. See Fig. 1. If voltage is less than 9 volts, go to step 17) (models with coil-on-plug) or next step (models with coil pack). If voltage is 9 volts or more, repair circuit for a short to power.
6) Check PIP Parameter Identifications (PID)

Using scan tool, select PIP PID from PID/DATA monitor menu. While observing scan tool, crank engine. If PIP value is switching on and off, check secondary ignition components (ignition coils, spark plugs and wires). See TEST JB. Repair as necessary. If secondary ignition is okay, go to step 15) (Natural Gas vehicles) or next step (all others).
7) Check Fuel Pressure

Turn ignition off. Release fuel pressure. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Install fuel pressure gauge. With scan tool connected, turn ignition on. Using scan tool, access OUTPUT TEST MODE. See ADDITIONAL SYSTEM FUNCTIONS. Command fuel pump ON. If fuel pressure is as specified, go to next step. See FUEL PRESSURE SPECIFICATIONS. If fuel pressure is not as specified, go to TEST HC.
8) Check Fuel Pressure Leakdown

Leave fuel pressure gauge installed and ignition on. Using scan tool, access OUTPUT TEST MODE. Command fuel pump ON to obtain maximum fuel pressure. Exit OUTPUT TEST MODE and turn ignition off. If fuel pressure remains within 2.3 psi (16 kPa) of maximum pressure for one minute after turning ignition off, go to next step. If fuel pressure does not remain within 2.3 psi (16 kPa), go to TEST HC.
NOTE: A no-start condition can only occur if more than 50 percent of fuel injectors are without power.

9) Check VPWR Circuit At Fuel Injectors
Disconnect at least 2 fuel injector connectors. Turn ignition on. Measure voltage of VPWR circuit at disconnected fuel injector connectors. If voltage is more that 10.5 volts, go to next step. If any measure is 10.5 volts or less, repair VPWR circuit.
10) Check Fuel Injectors

Turn ignition off. Release fuel pressure. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Install fuel pressure gauge. Disconnect Inertia Fuel Shutoff (IFS) connector. Turn ignition on and off several times. Monitor fuel pressure gauge while cranking engine for at least 5 seconds. If fuel pressure drops more than 5 psi (kPa), engine control system is not cause of no-start. Diagnose by symptom. Go to TROUBLE SHOOTING - NO CODES - EEC-V article. If fuel pressure does not drop more than 5 psi (kPa), replace PCM.
NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 10) to step 15). No test procedures have been omitted.

15) Check Fuel Pressure (Natural Gas Vehicles)

Turn ignition off. Release fuel pressure. See REMOVAL, OVERHAUL & INSTALLATION - NATURAL GAS VEHICLES article. With scan tool connected to DLC, access FRP PID. Turn ignition on and record fuel pressure. If fuel pressure is 80-120 psi (552-827 kPa), go to next step. If fuel pressure is not 80-120 psi (590-800 kPa), go to TEST HB.
16) Check Injector Signal From Natural Gas (NG) Module

Turn ignition off. Connect a 12-volt test light between injector signal circuit and VPWR circuit terminal at fuel injector connector. Crank engine while observing test light. If test light glows dimly while cranking engine, replace PCM and go to step 6). If test light does not glow as specified, go to TEST HA, step 47).
17) Check PCM Driver To Coils

Turn ignition off. Connect 12-volt test light between B+ and coil driver circuit. Crank engine while observing test light. Repeat procedure for each coil driver. Test light should blink brightly, once for each engine revolution. If test light blinks as specified, go to step 6). If test light does not blink as specified, go to TEST JD.

Dave H
Dec 17, 2008.
TEST Z: INTERMITTENT
Diagnostic Aids
Perform this test when instructed during QUICK TEST or if directed by other test procedures. This system test is intended to diagnose and isolate intermittent concerns for the following: All engine control sub-systems.
Vehicles with coil pack ignition systems.
The intermittent test table is used to determine which test to perform for the suspect circuit. See INTERMITTENT TEST table. Corresponding Parameter Identification (PIDs) for each circuit are listed. Some circuits do not have an associated PID and can be measured with a Digital Volt-Ohmmeter (DVOM). If vehicle has coil pack ignition system with a no-start condition, perform ignition test. Go to step 50).

1) Direction For Intermittent Diagnostic Path

There are 2 main procedures used in this system test to isolate and repair an intermittent concern. One procedure uses the Rotunda Distributorless Ignition System (DIS) Tester (007-00075) and the other uses a scan tool and a Digital Volt-Ohmmeter (DVOM). The distributorless ignition system tester is used on vehicles coil pack ignition systems. If vehicle has a ignition concern and is equipped with coil pack ignition, go to step 50). If vehicle is not as specified, go to next step.
2) Perform PCM Reset Procedure

If PCM reset produce has already been performed, go to next step. If PCM reset procedure has not been performed, perform PCM RESET procedure under SELF-DIAGNOSTIC SYSTEM. Ensure freeze frame data has been recorded before resetting PCM. After performing PCM reset procedure, go to next step.
3) Select PIDs Related To Symptom

Scan tool and a list of PIDs must be used to indicate area of fault. Obtain symptom from customer description. Use REFERENCE VALUE SYMPTOM table and REFERENCE VALUE/PID MEASUREMENT SIGNAL table in PIN VOLTAGE/PID VALUE CHARTS article to identity PIDs that relate to symptom. Make a list of symptom related PIDs and go to next step.
4) Symptom Verification

Path to symptom verification is optional, but is recommended for the following reasons: If vehicle is in for a repeat repair.
No DTCs present.
Customer has difficulty describing symptom.
If symptom needs to be verified, go to next step. If symptom is known and does not need to be verified, go to step 11).
5) Note All Available Data To Aid In Symptom Verification

Collect as much data as possible to aid in determining intermittent fault area. Note any freeze frame data that was recorded in step 2). Note any Continuous Memory DTCs that were present prior to performing PCM RESET in step 2). Also, obtain any information from customer that would aid in determining fault area. Go to next step.
NOTE: A road test may be necessary to recreate conditions that originally caused DTC to set.

6) Attempt To Recreate Symptom
Using scan tool, select and monitor PIDs displayed in freeze frame data (if available) and PIDs on list that was developed in step 3). Using freeze frame data recorded earlier, recreate conditions described by each freeze frame PID. Pay particular attention to ECT LOAD, RPM and VSS PIDs. Also use any information available from customer to aid in producing conditions for recreating symptom. When symptom occurs, press trigger on scan tool to begin recording. Refer to scan tool instruction manual for recorder function operation. If symptom is reproduced, go to step 11). If symptom cannot be reproduced, go to next step.
NOTE: PIDs for PCM outputs in pin voltage/PID value charts in PIN VOLTAGE/PID VALUE CHARTS article represent commanded values only. Circuit measurements made with DVOM indicate actual output status. If circuit measurement made with a DVOM differs from scan tool PID value, a circuit fault may be indicated. PIDs for PCM inputs that differ from circuit measurements made with a DVOM indicate a possible PCM fault.

7) Recreate Symptom Using Intermittent Road Test
The intermittent road test procedure is the last attempt to locate area of concern before physically disturbing vehicle circuits. Road test is a set of instructions for monitoring PID values or making circuit measurements with a DVOM. Procedure is performed under 4 conditions, Key On Engine Off (KOEO), hot idle, with vehicle speed at 30 MPH and 55 MPH. On part of procedure that requires a road test at 30 MPH and 55 MPH, a ride along assistant is necessary. Use PID values and circuit values in pin voltage/PID value charts to compare with actual PID values and circuit measurements made during road test. To perform KOEO part of procedure, locate appropriate pin voltage/PID value chart in PIN VOLTAGE/PID VALUE CHARTS article. Turn ignition on. Using scan tool, select and monitor PID values. Using a DVOM, measure circuits at breakout box identified in pin voltage/PID value charts. Compare scan tool PID values with circuit values made with DVOM. If any values are out of range, go to step 11). If all values are in range, go to next step.
8) Recreate Symptom Using Hot Idle Road Test Procedure

Start engine and allow to idle. Ensure engine is at normal operating temperature. Continue to monitor same PIDs and circuits as in step 7). If any values are out of range, go to step 11). If all values are in range, go to next step.
9) Recreate Symptom Using 30 MPH Road Test

Road test vehicle at 30 MPH and continue to monitor same PIDs and circuits as in step 7). If any values are out of range, go to step 11). If all values are in range, go to next step.
10) Recreate Symptom Using 55 MPH Road Test

Road test vehicle at 55 MPH and continue to monitor same PIDs and circuits as in step 7). If any values are out of range, go to next step. If all values are in range, it is now necessary to physically disturb selected circuit in an attempt to recreate intermittent concern. Go to next step.
11) Select Circuits To Be Tested From Intermittent Test Table

Remain in scan tool PID selection menu. If steps 7) -10) (intermittent road tests) were performed, select PIDs or circuits that values did not match PID values or circuit values made using DVOM and pin voltage/PID value chart. If steps 7) -10) were not performed, select PIDs from PID list made in step 3). On all applications, go to INTERMITTENT TEST table. Match selected PIDs to corresponding circuit in INTERMITTENT TEST table. It is possible to have more than one circuit to test. If a PID recording was made with scan tool in step 6), it may be helpful to replay recording at this time. Using INTERMITTENT TEST table, determine test to perform (input or output). To perform input test, go to next step. To perform output test, go to step 16).
12) KOEO Intermittent Input Test

Using circuits selected from INTERMITTENT TEST table, select only recommended PIDs to monitor with scan tool. If a PID is not available for a circuit, use a DVOM to monitor circuit. Turn ignition on. Go to area of suspect wiring or component fault. If input is a switch-type component, turn switch on manually. While observing PID/DVOM value, wiggle and pull on component wiring and connector. Lightly tap on component. If a fault is indicated, value will suddenly change. For correct values, see PIN VOLTAGE/PID VALUE CHARTS article. If no fault is indicated, go to next step. If a fault is indicated, check each related connector for loose, damaged or corroded terminals. Repair as necessary. If connector(s) is okay, replace suspect component.
13) KOER Intermittent Input Test

Start engine and allow to idle. Continue to monitor PIDs and/or circuits as in step 12). Turn ignition on. Go to area of suspect wiring or component fault. If input is a switch-type component, turn switch on manually. While observing PID/DVOM value, wiggle and pull on component wiring and connector. Lightly tap on component. If a fault is indicated, value will suddenly change. For correct values, see HOT IDLE values in appropriate pin voltage/PID value chart in PIN VOLTAGE/PID VALUE CHARTS article. If no fault is indicated, turn ignition off and go to next step. If a fault is indicated, check each related connector for loose, damaged or corroded terminals. Repair as necessary. If connector(s) is okay, replace suspect component.
14) KOEO Intermittent Water Soak Test

Turn ignition on. Continue to monitor PIDs and/or circuits as in step 13). Go to area of suspect wiring or component fault. If input is a switch-type component, turn switch on manually. While observing PID/DVOM value, lightly spray water on suspect component, circuit and connector. Include any relays or relay modules associated with fault. If a fault is indicated, value will suddenly change. For correct values, see KOEO values in appropriate pin voltage/PID value chart in PIN VOLTAGE/PID VALUE CHARTS article. If no fault is indicated, go to next step. If a fault is indicated, check each related connector for loose, damaged or corroded terminals. Repair as necessary. If connector(s) is okay, replace suspect component.
15) KOER Intermittent Water Soak Test

Start engine and allow to idle. Continue to monitor PIDs and/or circuits as in step 14). Go to area of suspect wiring or component fault. If input is a switch-type component, turn switch on manually. While observing PID value, lightly spray water on suspect component, circuit and connector. Include any relays or relay modules associated with fault. If a fault is indicated value will suddenly change. For correct values, see HOT IDLE values in appropriate pin voltage/PID value chart in PIN VOLTAGE/PID VALUE CHARTS article. If no fault is indicated, go to next step. If a fault is indicated, check each related connector for loose, damaged or corroded terminals. Repair as necessary. If connector(s) is okay, replace suspect component.
NOTE: PIDs selected from INTERMITTENT TEST table will display commanded values only. Circuit measurements made with DVOM will indicate actual values.

NOTE: OUTPUT TEST MODE defaults to its normal state after 10 minutes.

16) KOEO Intermittent Output Test
Using circuits chosen from INTERMITTENT TEST table, select only recommended PIDs to monitor with scan tool. Also use a DVOM to compare circuit values with scan tool PID values. If a PID is not available for a circuit, use a DVOM to monitor circuit. Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Turn all outputs on. Go to area of suspect wiring or component fault. While observing PID value, wiggle and pull on component wiring and connector. Lightly tap on component. If a fault is indicated, value will suddenly change. Also compare actual values with KOEO values in appropriate pin voltage/PID value chart in PIN VOLTAGE/PID VALUE CHARTS article. If no fault is indicated, exit OUTPUT TEST MODE and go to next step. If a fault is indicated, check each related connector for loose, damaged or corroded terminals. Repair as necessary. If connector(s) is okay, replace suspect component.
17) KOER Intermittent Output Test

Start engine and allow to idle. Continue to monitor PIDs and/or circuits as in step 16). Go to area of suspect wiring or component fault. While observing PID value, wiggle and pull on component wiring and connector. Lightly tap on component. If a fault is indicated, value will suddenly change. Also compare actual values with HOT IDLE values in appropriate pin voltage/PID value chart in PIN VOLTAGE/PID VALUE CHARTS article. If no fault is indicated, go to next step. If a fault is indicated, check each related connector for loose, damaged or corroded terminals. Repair as necessary. If connector(s) is okay, replace suspect component.
NOTE: If a coil for coil on plug applications has been tapped and is suspect, turn ignition off. Remove coil. Connect DVOM between spark plug terminal and signal terminal of coil. Observe DVOM and tap on coil. A large fluctuation in resistance indicates an intermittent open in coil. Replace coil as necessary.

NOTE: OUTPUT TEST MODE may not control some outputs, such as fuel injectors. To test outputs not controlled by OUTPUT TEST MODE, go to step 19).

18) KOEO Output Intermittent Water Soak Test
Turn ignition on. Using scan tool, access OUTPUT TEST MODE. Turn all outputs on. Continue to monitor PIDs and/or circuits as in step 17). Go to area of suspect wiring or component fault. While observing PID/DVOM value, lightly spray water on suspect component, circuit and connector. Include any relays or relay modules associated with fault. If a fault is indicated, value will suddenly change. Also compare actual values with KOEO values in appropriate pin voltage/PID value chart in PIN VOLTAGE/PID VALUE CHARTS article. If no fault is indicated, go to next step. If a fault is indicated, check each related connector for loose, damaged or corroded terminals. Repair as necessary. If connector(s) is okay, replace suspect component.
19) KOER Output Intermittent Water Soak Test

Start engine and allow to idle. Continue to monitor PIDs and/or circuits as in step 18). Go to area of suspect wiring or component fault. While observing PID value, lightly spray water on suspect component, circuit and connector. Include any relays or relay modules associated with fault. If a fault is indicated value will suddenly change. For correct values, see HOT IDLE values in appropriate pin voltage/PID value chart in PIN VOLTAGE/PID VALUE CHARTS article. If no fault is indicated, go to next step. If a fault is indicated, check each related connector for loose, damaged or corroded terminals. Repair as necessary. If connector(s) is okay, replace suspect component.
20) Check For Intermittent Mechanical Concerns

If not done previously, perform an inspection of mechanical systems relating to DTC or symptom. Check the following: Check if engine rocks during acceleration. If excessive movement is detected, check motor mounts.
Check for excessive component movement while driving vehicle during conditions that would cause vibrations (high RPM, rough roads, etc.).
Check accelerator and transmission linkages for contact or interference.
If any problems are detected, repair as necessary. If no problems are detected, fault cannot be identified at this time. Testing is complete.
NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 20) to step 50). No test procedures have been omitted.

NOTE: This following step is for vehicle equipped with coil pack ignition system. Testing must be performed using Rotunda Distributorless Ignition System (DIS) Tester (007-00075). If tester is not available, go to step 2) and continue testing.

50) Intermittent Ignition Test Procedure
Ensure all accessories are off and battery is fully charged. Perform QUICK TEST. If any DTCs are present, service DTCs as necessary before continuing with this test. If no DTCs are present, connect Rotunda Distributorless Ignition System (DIS) Tester (007-00075) and go to next step.
51) Perform Self-Test

Turn ignition off. Ensure all accessories are off. Install correct overlay on front of tester panel. Install appropriate program cartridge in slot. Connect proper harness adapter to DIS Tester 104-Pin PCM Adapter (007-00110). Set rotary knob to position 1. Ensure WIGGLE TEST switch is off. On Ranger 2.5L, set System Type switch to Dual Plug position. On all other 4-cylinder engines, set System Type switch to Non Dual Plug position. On all models, disconnect PCM 104-pin connector. Connect tester to PCM wiring harness connector. Turn ignition on. Press RESET button on tester. Tester will perform a self-test and all test LEDs will light and a beep will be heard. If CASE GND fault memory LED stays on, connect a jumper wire between PCM case to ground and continue with test. If tester performs self-test and VPWR LED turns on, go to step 220). If tester does not perform self-test or VPWR LED does not turn on, go to next step.
52) DIST Tester Check

Turn ignition off. Disconnect DIST tester. Connect jumper wire between VPWR jack at tester and positive battery terminal. Connect another jumper wire between PWR GND jack at tester and negative battery terminal. If tester performs self-test, go to step 220). If tester does not perform self-test, tester is not functioning properly. Replace tester and retest.
NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 52) to step 190). No test procedures have been omitted.

190) Check For Open VPWR Circuit

Turn ignition on. Measure voltage between VPWR jack at DIS tester and negative battery terminal. If voltage is more than 6 volts, go to next step. If voltage is 6 volts or less, repair open in VPWR circuit to PCM.
191) Check PWR GND Circuit

Turn ignition off. Measure resistance between PWR GND jack at tester and negative battery terminal. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in PWR GND circuit to PCM. Go to step 51).
192) Wiggle Check

Connect a jumper wire between PWR GND jack at tester and negative battery terminal. Turn ignition on. Set WIGGLE TEST switch on. Set MODE switch to " B" position. Wiggle and bend wiring harness and connectors. If tester resets, repair open in VPWR circuit to PCM. Go to step 51). If tester does not reset, repair open in PWR GND circuit to PCM. Go to step 51).
NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 192) to step 220). No test procedures have been omitted.

220) Check For Coil Faults

Turn ignition on. Press DIS tester RESET button and wait for tester to initialize. If COIL FAULT MEMORY LEDs are off, go to next step. If any COIL FAULT MEMORY LED is on or flashing, go to step 229).
221) Check CASE GND/CKP SHIELD

Leave ignition on. If CASE GND/CKP SHIELD FAULT MEMORY LED is off, go to next step. If CASE GND/CKP SHIELD FAULT MEMORY is on or flashing, go to step 253).
222) Check CKP BIAS

Leave ignition on. If CKP BIAS SYSTEM STATUS LED is on, go to next step. If CKP BIAS SYSTEM STATUS LED is off, go to step 243).
223) Check For Coil Fault

With DIS tester connected to vehicle, test drive vehicle. If vehicle will not start, crank engine for 5-10 seconds. If COIL FAULT MEMORY LEDs are off with engine running or during engine cranking, go to next step. If any COIL FAULT MEMORY LED is on, go to step 229).
224) CASE GND/CKP SHIELD Fault

With DIS tester connected to vehicle, test drive vehicle. If vehicle will not start, crank engine for 5-10 seconds. If CASE GND/CKP SHIELD FAULT MEMORY LED is off with engine running or during engine cranking, go to next step. If CASE GND/CKP SHIELD FAULT MEMORY LED is on, go to step 253).
225) Check CKP Status

With DIS tester connected to vehicle, test drive vehicle. If vehicle will not start, crank engine for 5-10 seconds. If CKP SYSTEM STATUS SIGNAL LED is off with engine running or during engine cranking, go to next step. If CKP SYSTEM STATUS SIGNAL LED is on, go to step 247).
226) Check For CTO Fault

With DIS tester connected to vehicle, test drive vehicle. If vehicle will not start, crank engine for 5-10 seconds. If CTO FAULT MEMORY LED is off with engine running or during engine cranking, go to next step. If CTO FAULT MEMORY LED is on, go to step 239).
227) Check For CKP Signal

With DIS tester connected to vehicle, test drive vehicle. If vehicle will not start, crank engine for 5-10 seconds. If CKP SIGNAL SYSTEM STATUS LED is on with engine running or during engine cranking, no fault is indicated at this time. Ignition system is okay and testing is complete. If CKP SIGNAL SYSTEM STATUS LED is off, go to step 247).
NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 227) to step 229). No test procedures have been omitted.

229) Check For Open IGN START/RUN Circuit

Turn ignition off. Disconnect ignition coil pack(s). Turn ignition on. Measure voltage between IGN START/RUN terminal at ignition coil pack wiring harness connector and PWR GND jack at DIS tester. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in IGN START/RUN circuit to coil pack(s).
230) Check For Short

Turn ignition off. Measure resistance between PWR GND jack and each COIL jack at DIS tester. Also measure resistance between VPWR jack and each COIL terminal at DIS tester. If all resistance readings are 6000 ohms or more, go to next step. If any resistance reading is less than 6000 ohms, go to step 236).
231) Check COIL Circuit Resistance

Turn ignition off. Measure resistance between each COIL jack at DIS tester and same terminal at ignition coil wiring harness connector. If each resistance reading is less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair open in appropriate COIL circuit and retest system.
232) Check COIL Circuit For Short Together

Measure resistance between each COIL jack and all other COIL jacks at DIS tester. If all resistance readings are 10,000 ohms or more, go to next step. If any resistance is less than 10,000 ohms, go to step 237).
233) Check For Hard Faults

Reconnect coil pack(s). Turn ignition on. Press DIS tester RESET button. Wait for initialization and coil test to run. If COIL FAULT MEMORY LEDs are off, go to next step. If any COIL FAULT MEMORY LED is on or flashing, go to step 238).
234) Wiggle Test Mode B

Set DIS tester WIGGLE TEST switch on. Set MODE switch to " B" position. Press RESET button and wait 5 seconds for initialization. Wiggle and bend wiring harness and connectors. If FAULT MEMORY LEDs are off, go to next step. If any FAULT MEMORY LED is on, press RESET button and wait for initialization. Continue to test until intermittent fault is located. Repair as necessary and retest.
235) Wiggle Test Mode B With Coil Disconnected

Turn ignition off. Disconnect coil pack(s). Turn ignition on. Press DIS tester RESET button and wait 5 seconds for initialization. Wiggle and bend wiring harness and connectors. If FAULT MEMORY LEDs are off, replace PCM and retest. If any FAULT MEMORY LED is on, press RESET button and wait for initialization. Continue to test until intermittent fault is located. Repair as necessary and retest.
236) Circuit Check

Turn ignition off. Disconnect PCM. Reconnect DIS tester to vehicle harness. Measure resistance between each COIL jack and PWR GND jack at DIS tester. Also measure resistance between COIL jack and VPWR jack at DIS tester. If all resistance readings are 10,000 ohms or more, replace PCM and retest. If any resistance reading is less than 10,000 ohms, repair open in COIL circuit.
237) Check For Short Between Coils

Ensure ignition is off. Disconnect PCM. Reconnect DIS tester between coils wiring harness. Measure resistance between each COIL jack and all other COIL jacks at DIS tester. If all resistance readings are 10,000 ohms or more, replace PCM and retest. If any resistance reading is less than 10,000 ohms, repair short between COIL circuits.
238) System Visual Check

Ensure ignition is off. Check ignition system connectors for loose, damaged or corroded terminals. Repair as necessary and retest. If connectors are okay, replace ignition coil pack(s).
239) Circuit Check

Measure resistance between CTO jack and PWR GND jack at DIS tester. Also measure resistance between CTO jack and VPWR jack at DIS tester. If any resistance reading is less than 1000 ohms, go to next step. If both resistance reading are more than 1000 ohms, go to step 241).
240) Isolate CTO Short

Leave ignition off. Disconnect PCM. Reconnect DIS tester to vehicle wiring harness. Measure resistance between CTO jack and PWR GND jack at DIS tester. Also measure resistance between CTO jack and VPWR jack at DIS tester. If both resistance readings are 1000 ohms or more, replace PCM and retest. If any resistance reading is less than 1000 ohms, repair fault in CTO circuit.
241) Wiggle Test Mode B

Turn ignition on. Set DIS tester WIGGLE TEST switch on. Set MODE switch to " B" position. Press DIS tester RESET button and wait 5 seconds for initialization. Wiggle and bend wiring harness and connectors. If all FAULT MEMORY LEDs are off, go to next step. If any FAULT MEMORY LED is on, press RESET button wait for initialization. Continue to test until intermittent fault is located. Repair as necessary and retest.
242) Wiggle Test

On 4- or 6-cylinder models, set DIS tester MODE switch to " A" position. On 8-cylinder models, set MODE switch to " C" position. On all models, press DIS tester RESET button and wait 5 seconds for initialization. Wiggle and bend wiring harness and connectors. If all FAULT MEMORY LEDs are off, replace PCM and retest. If any FAULT MEMORY LED is on, press RESET button and wait for initialization. Continue to test until intermittent fault is located. Repair as necessary and retest.
243) Check CKP BIAS

Turn ignition off. Disconnect CKP sensor connector. Turn ignition on. Press DIS tester RESET button and wait 5 seconds for initialization. If CKP BIAS SYSTEM STATUS LED is off, go to next step. If CKP BIAS SYSTEM STATUS LED is on, go to step 245).
244) Isolate Short Circuit

Ensure ignition is off. Disconnect PCM. Reconnect tester to vehicle wiring harness. Measure resistance between CKP+ jack and PWR GND jack at DIS tester. Also measure resistance between CKP+ jack and VPWR jack at DIS tester. If both resistance readings are more than 10,000 ohms, replace PCM and retest. If any resistance reading is 10,000 ohms or less, repair fault in CKP+ circuit.
245) Circuit Check

Measure resistance between CKP- jack and PWR GND jack at DIS tester. Also measure resistance between CKP- jack and VPWR jack at DIS tester. If any resistance reading is 10,000 ohms or less, go to next step. If both resistance readings are more than 10,000 ohms, replace CKP sensor and retest.
246) Isolate Short Circuit

Ensure ignition is off. Disconnect PCM. Reconnect DIS tester to vehicle wiring harness. Measure resistance between CKP- jack and PWR GND jack at DIS tester. Also measure resistance between CKP- jack and VPWR jack at DIS tester. If both resistance readings are more than 10,000 ohms, replace PCM and retest. If any resistance reading is 10,000 ohms or less, repair fault in CKP- circuit.
247) Check CKP Signal

Press DIS tester RESET button and wait 5 seconds for initialization. Crank or start engine. If CKP SIGNAL SYSTEM STATUS LED is off with engine running or during engine cranking, go to next step. If CKP SIGNAL SYSTEM STATUS LED is on, go to step 252).
248) Circuit Check

Turn ignition off. Disconnect CKP sensor. Measure resistance between CKP+ terminal at CKP sensor wiring harness connector and CKP+ jack at DIS tester. Also measure resistance between CKP- terminal at CKP sensor wiring harness connector and CKP- jack at DIS tester. If both resistance readings are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair CKP circuit and retest.
249) Check For CKP+ Short

Leave ignition off. Measure resistance between CKP+ jack and jacks for CKP-, PWR GND and VPWR at DIS tester. If any resistance reading is 10,000 ohms or less, go to next step. If all resistance readings are more than 10,000 ohms, go to step 251).
250) Isolate Short Circuit

Ensure ignition is off. Disconnect PCM. Reconnect DIS tester to vehicle wiring harness. Measure resistance between CKP+ jack and jacks for CKP-, PWR GND and VPWR at DIS tester. If any resistance reading is 10,000 ohms or less, repair CKP+ circuit and retest. If all resistance readings are more than 10,000 ohms, replace PCM and retest.
251) CKP Sensor Check

Turn ignition off. Inspect CKP sensor and pulse wheel for damage and correct alignment. Service CKP sensor and pulse wheel as necessary. If no problems are found, replace CKP sensor and retest.
252) Wiggle Test Mode B: CKP Circuit

Turn ignition on. Set DIS tester WIGGLE TEST switch on. Set MODE switch to " B" position. Press DIS tester RESET button and wait 5 seconds for initialization. Wiggle and bend wiring harness and connectors. If FAULT MEMORY LEDs are off, go to next step. If any FAULT MEMORY LED is on, press RESET button and wait for initialization. Continue to test until intermittent fault is located. Repair as necessary and retest.
253) Check CKP SHD For Short To Power

Turn ignition off. Measure resistance between CASE GND/CKP SHD jack and VPWR jack at DIS tester. If resistance is 10,000 ohms or less, go to next step. If resistance is more than 10,000 ohms, go to step 255).
254) Isolate Short

Ensure ignition is off. Disconnect PCM. Reconnect DIS tester to vehicle wiring harness. Measure resistance between CASE GND/CKP SHD jack and VPWR jack at DIS tester. If resistance is 10,000 ohms or less, repair CASE GND/CKP SHD circuit and retest. If resistance is more than 10,000 ohms, replace PCM and retest.
255) Wiggle Test Mode B: CKP Circuit

Turn ignition on. Set DIS tester WIGGLE TEST switch on. Set MODE switch to " B" position. Press DIS tester RESET button and wait 5 seconds for initialization. Wiggle and bend wiring harness and connectors. If FAULT MEMORY LEDs are off, repair CASE GND/CKP SHD circuit and retest. If any FAULT MEMORY LED is on, press RESET button and wait for initialization. Continue to test until intermittent fault is located. Repair as necessary and retest.

Dave H
Dec 17, 2008.
This problem happens after the engine is running for awhile. It will start back up after I wait 2 hrs and let the car sit and cool. Can a PCM act like this?

Tiny
Szalkuskt
Dec 18, 2008.
The PCM is basically computer circuitry. If it detects a fault in a sensor/switch/actuator etc. It should set up an alternative action to keep the engine running. It could be the PCM is getting too hot and a connection inside is breaking contact while hot and reconnecting when cooled again. I have seen this before. You should at least be getting MIL on the dash when engine cuts out. Are you getting the MIL showing when you turn key to ON position? Can you have the PCM read for fault codes? Most good autopart's stores do this for free. Let me know

COMPUTERIZED ENGINE CONTROLS
POWERTRAIN CONTROL MODULE (PCM)
PCM monitors engine operating conditions by input received from engine sensors. Control of output actuators determines fuel mixture and idle speed. For PCM location, see POWERTRAIN CONTROL MODULE LOCATION table.
The engine control system consists of the PCM, relays, modules, sensors, switches and actuators. The PCM sends out electrical reference signals to engine sensors and then analyzes the return signals. The engine sensors supply the PCM with specific information, in the form of electrical signals, to determine engine operating conditions.
In the event of a sensor or actuator failure, the PCM initiates an alternative strategy called Failure Mode Effects Management (FMEM) to allow the vehicle to maintain driveability. In the event of PCM failure, Hardware Limited Operation Strategy (HLOS) will be activated. HLOS is a system of alternate circuitry that provides minimal engine operation if the PCM fails. During HLOS, all self-test function will stop and system will be controlled by electronic hardware.
Malfunction Indicator Light (MIL) will remain on whenever FMEM or HLOS is in operation. FMEM and HLOS substitute a fixed signal and continue to monitor system failure. If signal(s) return to within operating limits, PCM will resume normal operation.

Dave H
Dec 18, 2008.
Well, The MIL is lit when the key goes to the " ON" position. I did some of the tests today. I read out the wiring for the Crank sensor to the PCM and the wires seem good and when the engine cranks the sensor generates a signal of 1.7 VAC which is good. Some of those steps in the troubleshhooting seem wrong in the test. I had a P0320 code before but I reset the computer after I changed the crank sensor. I think the PCM is bad because the engine just quits and I did have a P0320 code before and I checked the wiring from the crank sensor to the PCM, plus all the wires and plugs are good and I just replaced the coil pack. I saw the crank sensor generating good A/C voltage and I think the computer just don't know what to do. This problem is intermit also, it would not act like that if it was just a sensor or wire.I have a code reader myself in the garage.

Tiny
Szalkuskt
Dec 19, 2008.
You are quite correct. It would not act like this if it was a sensor or wire. It is possible the PCM has gone faulty. It's not uncommon. But I would get it tested before replacing this costly part. When you plug your reader in. What happens? Does it read/not read, link/not link, is it giving codes? Let me know?

Dave H
Dec 19, 2008.
I will read for codes tonight and let you know. I don't think it produced any codes since the first initial one p0320. I erased that after I replaced the CKP sensor. I went through the test JD, but at the point on step 18(check for short circuit) reading for resistance at pins 21 and 22 with both the PCM and the CKP sensor connector disconnected does not make sense to me. I am reading an open wire and of course it will read open. It is not until I plug the CKP sensor back in when I read 664 ohms. Step 17 I got 19,900 ohms which is good for the PCM. By me observing the 1.7 VAC generated by the CKP sensor, new coilpack, I believe it is the PCM. I will try and have it checked at the dealer. Is there a way I can bench test it myself with a DVOM? Are there any relays at the fuse box I should check?

Tiny
Szalkuskt
Dec 19, 2008.
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