Mechanics

ERRATIC IDLING

1995 Chrysler Concorde

Shakes or Wobbles problem
1995 Chrysler Concorde 6 cyl Front Wheel Drive Automatic 67000 miles

Car starts fine then if I rev it up slowly it starts erratically climbing, when I put it in gear it backfires repeatedly through intake and is very hesitant also cruise control light flips on and off as does the check engine light when in motion. Died once at parking lot speed.
it ran fine yesterday, I changed oil last night using mobil 1 10w30, a fram high mileage filter and lucas oil stabilizer I put a little over 5.5 quarts including oil stabilizer. Started it after oil change and drove to store it was fine then, but today is when problems started.

car has 3.5l engine and abs

23 0ct 08
i was just informed about turning the key on and off 3 times and keep it on the last time and the check engine light flashed as follows 1.2.4.3.5.5

25 Oct 08
replaced ignition coil pack still same problem

31 Oct 08
had a mechanic spend four hours going through it and replaced fuel filter and spark plugs no positive results car acts the same. The mechanic was completely stumped as to what is wrong getting no codes and everything seemed fine by scanner and checking all vacuum lines and all connections.
(scanner says car is okay to drive) mechanic thinks either computer is bad or timing is off slightly (doubts timing because car runs to smooth at idle, startup and killing seems normal).

01 Nov 08
today car overheated, I think the thermostat froze shut is it possible that my whole problem can be vapor lock or a cooling problem? Will replace thermostat and coolant temp sensor tomorrow.
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Rebtxn
October 22, 2008.




Code 12= Battery disconnected in last 50 starts, or module power lost
Code 43=Cylinder misfire or ignition coil circuit.
Code 55= end of test, or IAC not moving properly.
Check power and ground to battery and PCM, also test fuel pressure.
Go here and checkout our video.
http://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
You can rent the test gauge at Autozone.
TROUBLE CODES/MESSAGES (NOTE: FOR DTC TABLE, SEE TEST TC-1A UNDER "SELF-DIAGNOSTICS.") Code 11 DRB displays NO CRANK REFERENCE SIGNAL AT PCM. Condition is: no distributor, crankshaft, or camshaft reference signal picked up during cranking. Code 12 DRB displays BATTERY DISCONNECT. Condition is: direct battery voltage to PCM was disconnected within the last 50 key-on cycles. Code 13 DRB displays NO CHANGE IN MAP FROM START TO RUN. Condition is: no difference recognized between Manifold Absolute Pressure (MAP) reading and barometric (atmospheric) pressure reading at start-up. Code 14 DRB displays MAP VOLTAGE TOO LOW. Condition is: Manifold Absolute Pressure (MAP) sensor input less than minimum acceptable voltage. Code 14 DRB displays MAP VOLTAGE TOO HIGH. Condition is: Manifold Absolute Pressure (MAP) sensor input more than maximum acceptable voltage. Code 15 DRB displays NO VEHICLE SPEED SENSOR SIGNAL. Condition is: no Vehicle Speed Sensor (VSS) signal detected from Transmission Control Module (TCM) with road load conditions. Code 16 DRB displays KNOCK SENSOR #1 CIRCUIT or KNOCK SENSOR #2 CIRCUIT. Condition is: open or shorted condition detected in knock sensor circuit. Code 17 DRB displays ENGINE IS COLD TOO LONG. Condition is: coolant temperature stays less than normal operating temperature during vehicle operation. Page 1 of 6 TESTS W/CODES - 3.5L -Code 21 DRB displays LEFT O2S SHORTED TO VOLTAGE or RIGHT O2S SHORTED TO VOLTAGE. Condition is: oxygen sensor input voltage maintained at more than normal operating range. Code 22 DRB displays ECT SENSOR VOLTAGE TOO LOW. Condition is: Engine Coolant Temperature (ECT) sensor input less than minimum acceptable voltage. Code 22 DRB displays ECT SENSOR VOLTAGE TOO HIGH. Condition is: Engine Coolant Temperature (ECT) sensor input more than maximum acceptable voltage. Code 23 DRB displays INTAKE AIR TEMPERATURE SENSOR VOLTAGE LOW. Condition is: Intake Air Temperature (IAT) sensor input less than minimum acceptable voltage. Code 23 DRB displays INTAKE AIR TEMPERATURE SENSOR VOLTAGE HIGH. Condition is: Intake Air Temperature (IAT) sensor input more than maximum acceptable voltage. Code 24 DRB displays THROTTLE POSITION SENSOR VOLTAGE LOW. Condition is: Throttle Position Sensor (TPS) input less than minimum acceptable voltage. Code 24 DRB displays THROTTLE POSITION SENSOR VOLTAGE HIGH. Condition is: Throttle Position Sensor (TPS) input more than maximum acceptable voltage. Code 25 DRB displays IDLE AIR CONTROL MOTOR CIRCUITS. Condition is: shorted condition detected in one or more Idle Air Control (IAC) motor circuits. Code 27 DRB displays INJECTOR #1-6 CONTROL CIRCUIT. Condition is: injector output driver does not respond properly to Powertrain Control Module (PCM) control signal.
Code 31 DRB displays EVAP SOLENOID CIRCUIT. Condition is: open or shorted condition detected in purge solenoid circuit. Code 33 DRB displays A/C CLUTCH RELAY CIRCUIT. Condition is: open or shorted condition detected in A/C clutch relay circuit. Code 33 DRB displays A/C PRESSURE SENSOR VOLTAGE TOO LOW. Condition is: A/C pressure transducer input less than minimum acceptable voltage. Code 33 DRB displays A/C PRESSURE SENSOR VOLTAGE TOO HIGH. Condition is: A/C pressure transducer input more than maximum acceptable voltage. Code 34 DRB displays SPEED CONTROL SOLENOID CIRCUITS. Condition is: open or shorted condition detected in Speed Control (S/C) vacuum or vent solenoid circuits. Code 34 DRB displays SPEED CONTROL SWITCH ALWAYS LOW. Condition is: speed control switch input less than minimum acceptable voltage. Code 34 DRB displays SPEED CONTROL SWITCH ALWAYS HIGH. Condition is: speed control switch input more than maximum acceptable voltage. Code 35 DRB displays LOW SPEED FAN CTRL RELAY CIRCUIT. Condition is: open or shorted condition detected in low speed radiator fan relay circuit. Code 35 DRB displays HIGH SPEED FAN RELAY CTRL CIRCUIT. Condition is: open or shorted condition detected in high speed radiator fan relay circuit.
Code 41 DRB displays GENERATOR FIELD NOT SWITCHING PROPERLY. Condition is: open or shorted condition detected in generator field control circuit. Code 42 DRB displays AUTO SHUTDOWN RELAY CONTROL CIRCUIT. Condition is: open or shorted condition detected in Auto Shutdown (ASD) relay circuit. Code 43 DRB displays IGNITION COIL #1-3 PRIMARY CIRCUIT. Condition is: peak primary circuit current not achieved with maximum dwell time. Code 44 DRB displays BATTERY TEMP SENSOR VOLTS OUT OF LIMIT. Condition is: open or shorted condition exists in battery temperature sensor circuit or a problem is present in Powertrain Control Module (PCM) battery temperature voltage circuit. Code 46 DRB displays CHARGING SYSTEM VOLTAGE TOO HIGH. Condition is: battery voltage sense input more than target charging voltage during engine operation. Code 47 DRB displays CHARGING SYSTEM VOLTAGE TOO LOW. Condition is: battery voltage sense input less than target charging voltage during engine operation or no significant change detected in battery voltage during active test of generator output. Code 51 DRB displays LEFT O2S SIGNAL STAYS BELOW CENTER (LEAN) or RIGHT O2S SIGNAL STAYS BELOW CENTER (LEAN). Condition is: oxygen sensor input indicates lean air/fuel ratio condition during engine operation. Code 52 DRB displays LEFT O2S SIGNAL STAYS ABOVE CENTER (RICH) or RIGHT O2S SIGNAL STAYS ABOVE CENTER (RICH). Condition is: oxygen sensor input indicates rich air/fuel ratio condition during engine operation. Code 53
DRB displays INTERNAL CONTROLLER FAILURE or PCM FAILURE SPI COMMUNICATIONS. Condition is: Powertrain Control Module (PCM) detects internal failure. Code 54 DRB displays NO CAM SYNC SIGNAL AT PCM. Condition is: no fuel sync signal (camshaft signal) detected during engine cranking. Code 55 DRB display will be blank. Completion of trouble code display by Malfunction Indicator Light (MIL), (CHECK ENGINE) light. Code 62 DRB displays PCM FAILURE SPI MILES NOT STORED. Condition is: unsuccessful attempt to update SPI mileage. Code 63 DRB displays PCM FAILURE EEPROM WRITE DENIED. Condition is: unsuccessful attempt to write to an EEPROM location by PCM. Code 65 DRB displays MANIFOLD TUNING VALVE SOLENOID CIRCUIT. Condition is: open or shorted condition detected in Manifold Tuning Valve (MTV) solenoid circuit. Code 66 DRB displays NO CCD MESSAGES FROM TCM. Condition is: Powertrain Control Module (PCM) did not receive CCD BUS messages from Transmission Control Module (TCM). Code 66 DRB displays NO CCD MESSAGES FROM BODY CONTROL MODULE. Condition is: Powertrain Control Module (PCM) did not receive CCD BUS messages from Body Control Module (BCM). Code 77 DRB displays SPEED CONTROL POWER RELAY CKT. Condition is: open or shorted condition detected in speed control relay circuit. CAUTION: When battery is disconnected, vehicle computer and energy systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.

Merlin2021
Nov 2, 2008.
Fuel pressure has been checked and is 40 at idle 49 when car is off and between 800 rpm (idle) and 1700 rpm gauge jumps between 40 and 50

Tiny
Rebtxn
Nov 2, 2008.
Look OK but test the pressure regulator as shown, and test the injectors with an ohm meter reading should be 12 ohms on all of them.
BASIC TESTING - 3.5L -1995 Chrysler Concorde
Page 1 of 3
FUEL PRESSURE
Basic diagnosis of fuel system should begin with determining fuel system pressure.

WARNING: ALWAYS relieve fuel pressure before disconnecting any fuel injection-related component. See appropriate RELIEVING FUEL PRESSURE procedure. DO NOT allow fuel to contact engine or electrical components.
Relieving Fuel Pressure (Vehicles With Fuel Rail Test Port) -Disconnect negative battery cable. Slowly open fuel tank cap to release pressure in tank. To release remaining pressure in system, remove fuel rail pressure test port cap. Place open end of Fuel Pressure Release Hose (C-4799-A) in approved gasoline container. Connect other end of pressure release hose to test port. Fuel pressure will bleed-off into container.
Relieving Fuel Pressure (Vehicles Without Fuel Rail Test Port) -Disconnect fuel pump wiring harness connector at fuel tank. Start engine. Let engine run until fuel is exhausted and engine stops. Turn ignition off. Disconnect negative battery cable. Connect fuel pump wiring harness connector.
WARNING: Perform fuel pump test with fuel tank at least half full. Before disconnecting fuel lines or fuel system components, relieve fuel pressure. See appropriate RELIEVING FUEL PRESSURE procedure.

Checking Fuel Pressure (Vehicles With Fuel Rail Test Port)
1.Relieve fuel pressure. On vehicles with vacuum assisted fuel pressure regulators, disconnect vacuum hose from fuel pressure regulator before checking fuel pressure. Remove fuel rail test port protective cap. Connect Fuel Pressure Gauge (C-4799) to fuel rail test port.
CAUTION:DO NOT activate fuel pump for long periods, or engine may hydrostatically (liquid) lock.
2.Turn ignition switch to ON position. Using Diagnostic Readout Box (DRB), select ASD FUEL SYSTEM TEST mode. In this mode, DRB energizes Auto Shutdown (ASD) relay, causing fuel pump to activate and pressurize fuel system. 3.Note fuel pressure, and record reading. Deactivate fuel pump. Relieve fuel pressure. Remove fuel pressure gauge. Reactivate fuel pump. Ensure fuel does not leak from fuel rail test port. Deactivate fuel pump. Install fuel rail test port protective cap. 4.If fuel pressure is within specification, fuel system is functioning properly and further testing is not required. See FUEL SYSTEM PRESSURE SPECIFICATIONS table. If fuel pressure is greater than specification, go to step 7). If fuel pressure is less than specification, install Fuel Pressure Gauge (C-4799) and appropriate fuel pressure test adapter in fuel supply line between fuel tank and fuel filter. 5.Using DRB, repeat ASD FUEL SYSTEM TEST. If fuel pressure is at least 5 psi greater than fuel pressure recorded in step 3), replace fuel filter. If no change in fuel pressure is observed, gently squeeze fuel return hose.

11/3/2008
BASIC TESTING - 3.5L -1995 Chrysler Concorde
Page 2 of 3
6.If fuel pressure increases while squeezing fuel return hose, replace fuel pressure regulator. If fuel pressure does not change while squeezing fuel return hose, check for plugged fuel inlet strainer or defective fuel pump. Repair as necessary. 7.Remove fuel return hose from fuel pump at fuel tank. Connect fuel pressure test adapter to return hose. Place other end of adapter into an approved gasoline container (minimum 2 gallon size). 8.Turn ignition switch to ON position. Repeat ASD FUEL SYSTEM TEST. If fuel pressure is now correct, replace fuel pump assembly. See FUEL SYSTEM PRESSURE SPECIFICATIONS table. If pressure is still greater than specification, deactivate fuel pump. Remove fuel pressure test adapter, and connect fuel pump return hose. 9.Disconnect fuel return hose from chassis fuel lines at engine. Connect fuel pressure test connector adapter to fuel return hose. Place other end of hose in approved gasoline container. Repeat ASD FUEL SYSTEM TEST. 10.If fuel pressure is now correct, check for restricted fuel return line. If no change is observed, replace fuel pressure regulator.
FUEL SYSTEM PRESSURE SPECIFICATIONS Application 3.5L
psi (kg/cm2 ) 48 (3.4)
WARNING: Perform fuel pump test with fuel tank at least half full. Before disconnecting fuel lines or fuel system components, relieve fuel pressure. See appropriate RELIEVING FUEL PRESSURE procedure.

Checking Fuel Pressure (Vehicles Without Fuel Rail Test Port)
1.Relieve fuel pressure. On vehicles with vacuum assisted fuel pressure regulators, disconnect vacuum hose from fuel pressure regulator before checking fuel pressure. 2.On all vehicles, disconnect fuel supply hose from chassis lines at engine. Connect Fuel Pressure Gauge (C-4799) to appropriate fuel pressure test adapter. Install adapter between fuel supply hose and chassis fuel line.
CAUTION:DO NOT activate fuel pump for long periods, or engine may hydrostatically (liquid) lock.
3.Turn ignition switch to ON position. Using Diagnostic Readout Box (DRB), select ASD FUEL SYSTEM TEST mode. In this mode, DRB energizes Auto Shutdown (ASD) relay, causing fuel pump to activate and pressurize fuel system. 4.Note fuel pressure, and record reading. Stop ASD FUEL SYSTEM test mode. Relieve fuel pressure. Remove fuel pressure gauge. If fuel pressure is within specification, fuel system is functioning properly and further testing is not required. See FUEL SYSTEM PRESSURE SPECIFICATIONS table. 5.If fuel pressure is greater than specification, go to step 8). If fuel pressure is less than specification, install Fuel Pressure Gauge(C-4799) and fuel pressure test adapter in fuel supply line between fuel tank and fuel filter. 6.Repeat ASD FUEL SYSTEM TEST. If fuel pressure is at least 5 psi greater than fuel pressure

11/3/2008
BASIC TESTING - 3.5L -1995 Chrysler Concorde
Page 3 of 3
recorded in step 4), replace fuel filter. If no change is observed, gently squeeze fuel return hose. 7.If fuel pressure increases while squeezing fuel return hose, replace fuel pressure regulator. If fuel pressure does not change while squeezing fuel return hose, problem may either be a plugged fuel inlet strainer or defective fuel pump. Repair as necessary. 8.Disconnect fuel return hose from fuel pump at fuel tank. Connect appropriate fuel pressure test adapter to fuel return hose. Place other end of adapter into an approved 2 gallon gasoline container. 9.Turn ignition switch to ON position. Repeat ASD FUEL SYSTEM TEST. If pressure is now correct, replace fuel pump assembly. See FUEL SYSTEM PRESSURE SPECIFICATIONS table. If pressure is still greater than specification, deactivate fuel pump. Remove fuel pressure test adapter, and connect fuel pump return hose. 10.Disconnect fuel return hose from chassis fuel lines at engine. Connect fuel pressure test connector adapter to fuel return hose. Place other end of hose in an approved gasoline container. Repeat ASD FUEL SYSTEM TEST. 11.If pressure is now correct, check for restricted fuel return line. If no change is observed, replace fuel pressure regulator.

11/3/2008
BASIC TESTING - 3.5L -1995 Chrysler Concorde
Page 1 of 1
DIRECT IGNITION SYSTEM (DIS) V6
Spark Test
1.Remove spark plug cable from cylinder No. 2. Insert a known-good spark plug into spark plug cable. Ground spark plug on engine. Crank engine and check for spark. Repeat procedure at remaining cylinders. 2.If no spark or an irregular, weak spark is present at one or more spark plug cables, go to IGNITION CABLE RESISTANCE TEST. If no spark is present, go to NO-START TEST.
Ignition Cable Resistance Test
Remove ignition cables, and measure their resistance (3000-12,000 ohms per foot). Replace cable(s) if cable resistance is not as specified. If resistance is as specified, go to IGNITION COIL RESISTANCE TEST.
Ignition Coil Resistance Test
1.Disconnect ignition coil harness connector. Measure primary coil resistance between battery voltage terminal and pin corresponding to cylinder(s) in question. See Fig. 1 . 2.Measure secondary coil resistance between coil towers of grouped cylinders; No. 1 and 4, 2 and 5, and 3 and 6. Replace ignition coil if primary/secondary coil resistance is not as specified. See IGNITION COIL RESISTANCE table under IGNITION COIL.
No-Start Test
1.Ensure battery is fully charged (at least 12.6 volts). Disconnect coil electrical connector. Connect a test light to coil electrical connector battery voltage terminal. See Fig. 1 . 2.Turn ignition switch to ON position. Test light should momentarily flash on and off. If test light does not momentarily flash on and off, ASD relay has failed to energize. Check ASD relay and related circuits. See appropriate TESTS W/CODES - 3.5L article. 3.If test light momentarily flashes on and off, PCM has grounded Auto Shutdown (ASD) relay. Go to next step. DO NOT turn ignition off at this time. 4.Crank engine, and observe test light. If ignition was turned off at end of step 3), turn ignition switch to ON position, wait for test light to flash once, and then crank engine. 5.If test light momentarily flashes during cranking, engine controller is not receiving a camshaft sensor signal. Check camshaft sensor and related sensor circuits. See TESTS W/CODES - 3.5L article. 6.If test light does not flash during cranking, disconnect camshaft sensor connector. Turn ignition switch to OFF and then to ON position. Wait for test light to momentarily flash once, and then crank engine. 7.If test light momentarily flashes, camshaft sensor is shorted and must be replaced. If test light does not flash, no-start condition is caused by problem in crankshaft or camshaft sensor 9-volt power supply circuit or by crankshaft sensor 5-volt output or ground circuits. See appropriate TESTS W/CODES - 3.5L article.
Fig. 1: Identifying DIS Coil & Wiring Harness Connector Terminals
Courtesy of CHRYSLER CORP.


http://www.2carpros.com/forum/automotive_pictures/62217_Concorde_Coil_1.jpg



If you can narrow down which cylinder is misfiring, there are tests for the wiring to the PCM for each cylinder. If it backfires all the time when accelerating, the camshaft may be worn.
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Merlin2021
Nov 3, 2008.
Haven't tested injectors but I replaced thermostat and coolant temp sensor and the car has no miss and runs smooth and perfect now took on a 20 mile drive with my bro inlaw following me up hills and down and car didn't have so much as a hiccup.
Outta curiosity I will test injectors though. Thank you for your timely responses.

Tiny
Rebtxn
Nov 3, 2008.
If it's running smoothly, my old saying is if it aint broke, dont fix it!

Merlin2021
Nov 7, 2008.

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