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  #1 (permalink)  
Old 19 Jun 2014, 06:43 pm
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Default pcm

Is there any way to check to see if a pcm is good or not
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  #2 (permalink)  
Old 19 Jun 2014, 06:47 pm
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Default Re: pcm

If you have multiple DTC's it may be an indication of a failing ECU/PCM. There is no reasonable DIY way to test a PCM. In most cases it would have to be removed and sent to a qualified ECU/TCM/PCM rebuilder.
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Old 19 Jun 2014, 11:02 pm
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Default Re: pcm

My PCM/ECU/TCU in my 06 is bad and I get multiple and variable codes, replaced 2nd time going for 3

Current Fault Log first replaced PCM

NOTES:
NO codes with key dance shows "dOnE"
Engine Service Light comes on immediately after starting the PT
Codes cleared multiple times, disconnected battery, tramped on brake pedal.
and shorted battery cables after disconnecting them-- no change
SUNROOF HAD NO POWER
TRANNY IN LIMP MODE
Range selector shows PRND and changes far right to blank depending on shift selector does not show 3 or 1
SPEED odomerter doesn't work
No rear running lights or license plate light
Changed engine wiring harness -- no change in codes
Tried Instrument cluster (BCM) no change in codes reinstalled original
Replaced 02 With chrysler sensor No change in codes
------------------

U0101: Unknown code - More information may be available on the web
P1603: [Chrysler] Loss of SDM Serial Data
P0032: HO2S Heater Control Circuit High (Bank 1 Sensor 1)
P3432: Cylinder 4 Exhaust Valve Control Circuit High
P3641: Unknown code - More information may be available on the web
U3041: Unknown code - More information may be available on the web

other scans showed variable codes including network data loss and a few others

Returned PCM/ECU/TCU early June to rebuilder to be checked They said they had trouble with the programming of 06 PT Cruisers


------------------
Second replaced PCM
Current Fault Log
NOTES:
tranny now works
speedometer now works
Range selector now shows PRND and changes far right to 3 or 1 depending on shift selector
lights all work
rewired sunroof to have power all the time it probably has power on original circuit
AC ?
------------------
P1128: not going closed loop
P0032: HO2S Heater Control Circuit High (Bank 1 Sensor 1)
Pending Fault Log
----------------------------------------------------
P0672: GLOW PLUG ????
P1684: [Chrysler] battery disconnect Driver 5 Line 4


Returned second PCM/ECU/TCU on June 17 to rebuilder to be checked They said they had trouble with the programming of 06 PT Cruisers


EXCUSES:
They thought I tried to reprogram the first one because it had a code ?
And they were sure I had other problems when the speedometer, transmission and rear lights would not work, but they all worked after they sent me the second unit.

Im tending to think they sand blast and paint units they get in
reset the programming, which is plug and play even with my security keys.
Car starts and runs as well as could be expected with o2 not working
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Last edited by JoeX; 19 Jun 2014 at 11:07 pm.
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Old 19 Jun 2014, 11:32 pm
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Default Re: pcm

Not sure or care who you got your refurbished PCM from or did you get a PCM and TCM confused on that point? These are 2 different parts. The difference between a PCM and ECU are manufactures decided component names but both are considered in the industry the same. In this case Chrysler calls them PCM's. A TCM is for the transmission and its operation is different from the main unit that basically controls everything which is the PCM. (simplified explanation)

Another simplified explanation of a process....specifically ECU's that are refurbished. These ECUs are first checked for physical damage. Sometimes they are cosmetically prepped for retail sales service. Many refurbishers don't even bother to clean the auto recyclers accumulated environment off them before reselling them. Why would they it has nothing to do with the function and the end unit would cost more to the consumer. A very minor electrical diagnostic check is done which mostly checks for electric shorts or dead memory area's. Very few ECU's are ever opened up. This can cause the factory sealant to fail if the cases are re-assembled. Replacing the factory electrical sealant is very costly and 99% of the time not necessary. It is easy to toss a ECU unit that fails any of the re-furbishing process then to try to completely rebuild it and replace failed components. If the ECU passes inspection and minor testing then the ECU is flashed with a file of the operating program for the model vehicle using the VIN supplied. This is usually copied from a known and working ECU. Very few refurbishers have factory authorized firmware to use for re-flashing.

Your experience is an isolated one and I would start looking carefully at the prom connectors for damage or in the primary power pack harness.


Not trying to get anyone upset but....
IMHO I would say that if they replace a third unit that will be the last from them and I am sure they will cheerfully refund your money because they like myself may think it is not the PCM failing itself but something undiagnosed that is causing failure or improper operation of your PCM.
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  #5 (permalink)  
Old 20 Jun 2014, 08:09 pm
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Default Re: pcm

CAN BUS 06
My understanding is the TCM is now part of the PCM which controls the ECM (Engine Control Module)and is separate from the TIPM (Totally Integrated Power Module) which replaced the majority of the relays and holds the fuses.
It can be checked to sensors for correct or no voltage and ground .
In my case the P0032 was not sending any voltage to the O2 sensor, most likley the PCM was shorted internally.
only time will tell.
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Addicted to Mopar You can tell how old I am..
65 Dodge Coronet 6 cyl 2dr Post
66 Ply Satellite with 273 engine swap to 69 340 4spd
70 340 4spd Dart Swinger "Those were the days my friend"
73 Charger SE
Had a few Vetts on the way 69, 85
Several Neons some flips
01 Sebring flip
Cruiser's 01, 220K Gone to a new home
Cruiser 03 133K Gone to a new home
Cruiser 06 110K Project Gone to new Home
Cruiser 05 Ltd 120,809 bought with broken belt Oct2015
May 16 Resurrected to once again roam the streets.

20 Miles South Of Pittsburgh
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  #6 (permalink)  
Old 20 Jun 2014, 10:17 pm
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Default Re: pcm

you are cutting hairs and I did say simplified explanation!
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