QuestionHistory- purchased used and had a problem of starting when cold then die- but would start and run ok- slowly got a little
worse. The wife said car would kick cruise off everyonce in awhile and act like there was no power when pressing gas
sometimes too on highway.
Took to a shop I wanted a scan run, replace plugs etc. They asked if timing belt ever changed.. I did not know but
vehicle had 120k+ so I said ok to replace. They replace it, said scan showed nothing but did not do any thing else.
I drove from the shop about 1 mile stopped and did some Christmas shopping, came out, unlocked door and ALARM goes off....
did not even know it had one. We had this car for about 1 yr with no alrm problems.
Chrysler had to disable auto door locks so I could drive it. Said PCM and or the BCM would need to be replaced to fix door
locks again. But said no other problems.
It continued start cold then die but ran ok. Then 2 months it died while driving it and car was warm, would not start again
until next day but died within 3-4 min. and not start again till next day, then no start no spark.
I replaced crankshaft sensor,---no spark
I read a question and answer between you and Dean--97 Sebring, sounded similar.
Checked 8v on O/w wire pin 44 PCM- 8v key on 8v trying to start.
DkG/O wire pin 6 of PCM from ASD is -key on 12v then drops to 0 V-- trying to start is- 10.5v
Gry/Blk wire pin 11 to T/Blk pin 26 is --key on 3v-- trying to start 2.4-2.5volts...tried turning by hand but voltage seemed
to stay 3v.
I have done a key on-off-on etc.. got codes 12 , 71 , 33 , 22-[cause i unplugged sensor] and 55 in that
order each time I try the key dance.
I just bought a scan tool that reads OBD I and OBD II and it says unable to establish connection.
I checked continuity from 6-pin connector of dist.-ok 2-pin plug single wire of dist-ok
took off dist.cap checked resistance-per chiltons book -OK
Found build up of stuff on each of terminals inside cap--I cleaned up. Could that prevent the spark?
I'm going to change plugs b4 i put the intake back on and did'nt have them today---SUNDAY other wise I'll be putting back
together. Hope the DIST/cam sensor is OK
??- car is a 95 ,under hood says OBD I compliant but can't find OBD I DLC under the hood. It does have DLC.. drivers side
under dash... which I connected to. Is this car OBD I or II? I'm leaning towards a new PCM cause other forum said getting
a data link error/communication usually means a bad PCM. But on forums have read many problems very similar to mine and the
distributor/cam sensor and or crankshaft sensor was problem.Costs too much money and time to just start replacing any more
parts!!
Sorry for the long story, but hope the more I can tell you the better.
Very much appreciate and need your help.
Thank you---Tracy
AnswerHi Tracey,
The 71 code is about the 5 volt sensor supply voltage being too low, not that the PCM is definitely bad. The sensors that draw on the source are: TPS, MAP, AC system pressure sensor, egr solenoid any one of which could be malfunctioning or it could be shorted to ground, or the pcm could be bad.
Start by disconnecting the TPS and measure the voltage at the harness for the 5 volt supply wire (violet/white) with the ignition on. Is it below 4.5? No: reconnect to TPS. go to MAP and do the same measurement. Is the voltage below 4.5? yes, replace TPSs; no, check harnesses for damage.
Yes: then continue to monitor at TPS harness while you disconnect the MAP sensor.
Did the voltage rise above 4.5? yes, replace MAP; no, do the same monitoring at the TPS harness only this time disconnect the AC pressure sensor and see if voltage goes above 4.5V. Yes, replace pressure sensor; no, do the same only this time disconnect egr solenoid:
voltage rise above 4.5V?, then replace egr solenoid; no, then disconnect all four sensor listed above AND the multipin PCM connector that has pins 41-80, where 5V is on pin 61, in order to disconnect the 5V supply from the harness. Now measure Resistance from the TPS harness plug violet/white to ground to see if it is shorted to ground. Yes, repair short to ground in that violet/white wire tree somewhere: No, replace PCM.
The 33 code is about the AC pressure sensor voltage being too low or high, which may just be manifestation of 71, or it could be the cause of 71, so 33 and 71 will probably both disappear once you figure out why 71.
I believe that you have an OBD I system because the OBD II didn't start until the '96 model year (unless you have the 2.0L with manual transmission, but it appears use have the 2.5L from what you tell me). I would expect there to be a DLC under the hood for access to the PCM, and a DLC under the dash for access to the BCM and TCM. But if you are getting the codes you are from the under dash connector, and those seem like PCM codes, then there must not be one under the hood. '95 was the first year of the Cirrus so it could be unique as far as DLC provision.
Thanks for the very long history. I haven't had a chance to evaluate all the details, choosing instead to focus on the fault codes. That 5V supply seems to me to be important.
Roland
