1995 chrysler cirrus lx-the engine cuts off when moving-driving
I have a '95 Cirrus LX 2.5L V6 (with 150k miles) that has been having the same problem -- it just shuts off unexpectedly while driving and then fails to start right afterward. No "Check Engine" light beforehand and no fault codes were stored. After setting for a while, the car would eventually start again. Initially this problem happened only seldomly but over several months it gradually became more frequent.
After doing a lot of research on the Internet and troubleshooting with the Haynes manual, the prime suspects were as follows:
1) Crankshaft Position Sensor (mounted onto the engine block under the distributor). I replaced this and the car started but it didn't last long before it abruptly quit again. This time, whatever was degrading finally broke for good; the car would no longer start even after sitting for a couple days.
2) Camshaft Position sensor and/or ignition coil -- (both are in the distributor on the 95 Cirrus LX 2.5L V6). I replaced the distributor (cost about $225). The car still would not start, though!
Using the electrical diagrams in the Haynes manual, I began troubleshooting and found that all of the top three mentioned items use the same +8VDC from pin 44 of the Powertrain Control Module (PCM). I was only reading +4.88VDC -- way too low for for the two 'Hall Effect' solid-state sensors to work properly.
I didn't want to spend hundreds of dollars buying a new PCM if I wasn't absolutely sure it was the problem so I took out my PCM (it's up front between the fuse box and the air cleaner on the driver's side and can be removed fairly easily). Since this is a single-board electronic device, being an electronics technician, I tried an old trick and froze the PCM for more than 12 hours so the circuit board and solder joints would contract and make a better connection. I then reinstalled the PCM and tried starting the engine -- and it fired right up and ran smoothly.
So, the PCM (P/N PO4606064) ended up being my problem.
NOTE: There are two replacement models of PCM for this car. One model is for cars with "Firm Feel Suspension (FFS)" and another model for those without; mine DOES NOT HAVE FFS. Make sure you get the correct one.
Also, on one of the threads on the Internet for another person having this same problem, a Master Mechanic stated that 'Firm Feel Suspension (FFS)' was the same thing as "Speed Sensitive (power-assisted) Steering (SSS)". I confirmed with the Chrysler experts that THIS IS NOT THE CASE! They are separate things -- according to my VIN, my car does not have FFS but it has SSS.
Feb 25, 2010 |
1995 Chrysler Cirrus