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.
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Szalkuskt
December 17, 2008.




I need all the figures starting from #7. Did they do this because it gave problems to the PCM? Where did the water get into? The PCM and fry it up? I tried to start the car after reseating the PCM and PCM relay. The MIL light is on when key on ign off. The MIL light goes out while cranking the engine. My PCM has to be bad now. No codes are present. I ran my scanner and NO codes.

Tiny
Szalkuskt
Dec 20, 2008.
This is all it say's regarding damage to PCM, of course the longer the water is getting in the more damage would occur .. i'm pretty sure it must have fried a few along the way ??

The water leakage may be due to the PCM connector cover not seating completely and water leaking down from the cowl panel grille (cowl top vent panel) area.
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During normal diagnostic and repair procedures, inspect for evidence of water damage at the PCM, PCM connector, and/or transaxle. If present, inspect the sealing area of the PCM cover, seal the water leak path in the cowl panel grill area, and service the PCM as needed per the following Service Procedure.
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Dave H
Dec 20, 2008.
This is a strip of soft foam insulation Fig 7.


http://www.2carpros.com/forum/automotive_pictures/266999_7_2.jpg


Dave H
Dec 20, 2008.
The relay get's power from fuse # 9 (hot in start) in under dash fuse box. Through a diode to pin #86 on relay. Inside relay is a resistor and solonoid to pin #85 which goes to ground. Relay pin # 30 goes to fuse # 1(hot all times) in power distribution box underhood and relay pin 87 goes to fuses # 19 and 20 in underhood fuse/relay box which send power to HO2s 11, shift solonoid, EGR valve solonoid

Dave H
Dec 20, 2008.
I looked at ALL the fuses inside and under the hood and they are ALL good. The four relays in the underhood distibution box are the same part# so I swapped one from another space and put it where the existing PCM relay was. Tried to start the car and no joy. Ireally think the PCM is bad now because of all the rain. Maybe if the PCM is bad it won't produce a MIL code. I am thinking about getting the $150 PCM exchange on ebay. He will flash all the new calibration I guess too, which my van probably needs. Me watching that crank sensor producing a good 1.7 VAC and the previous P0320 code makes me think it is the PCM, plus with that bulletin about all the water entering the cowl makes sense because when the van first died it was in the pouring rain on the highway after sitting at home and other places in the heavy heavy rain downpours we recently had here.

Tiny
Szalkuskt
Dec 21, 2008.
I am leaning towards PCM now as well? What I can't come to grips with, is why it would start and run ok. Before we removed the PCM plug. And now it won't?.I think the new PCM is a good price and I will be using them in the future if needs be? This is the frustrating thing. Not being able to be hands on to double check we haven't missed something. I don't want to advise you to spend $150 on a pcm. Only to find it still doesn't run. On the other hand I can't think of any other reason it will not fire up now as long as everything is back together as before. Can you double check all wires, sensors etc.. Check we are getting fuel and spark. We are obviously not getting one of them or it would be firing up?
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Dave H
Dec 21, 2008.
Well, I don't think it has anything to do with disconnecting the PCM. This whole time since the first time it died until now it has been the luck of the draw if it would start again. I thought it was due to a hot engine compartment, but now after days of being cold and checking that good crank sensor voltage of 1.7vac while cranking means the computer should know the engine is rotating. The Heavy rains we have had here make me lean toward the PCM too. This PCM must not like moisture otherwise we would not have all of these TSB's about rain entering the pcm area though a bad cowl vent drainage. All the fuses are good. I swapped the PCM relay with an adjacent one.I installed a new coil pack.I installed the new crank sensor and verified it works through the DVOM test. I opened the PCM and it is all covered with a protective clear resin but maybe some water intrusion at the plug connector shorted it out. There iis not a rubber gasket where the connector plug connects to the PCM pins, just a connection. This is probably where Ford dd not think about weather proofing the connection. I think my van could use new flashed updates on the computer anyway. It has never had a PCM calibration and this might help it run better. I WILL CHECK FOR SPARK BUT REMEMBER WE HAD A P0320 CODE IN THE BEGINNING AND THAT MAKES ME BELIEVE IT'S NOT A FUEL ISSUE. GOTTA BE A SPARK PROBLEM.

Tiny
Szalkuskt
Dec 21, 2008.
I checked for spark and there was no spark. No codes. MIL lamp goes off while cranking. Anti theft light goes off while cranking. I can hear fuel pump run during Key on.

Tiny
Szalkuskt
Dec 21, 2008.
We could do the last 2 tests, to see what voltage/ohms your getting? From PCM to CKP

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 22, 2008.
I started to try do these steps but they are worded wrong. Step 1 says: 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

Tiny
Szalkuskt
Dec 22, 2008.

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