Tom76043 wrote:
I have a 95 LT1 which now will start but dies within about 15 to 20 seconds after start.
CCM code shows DTC 41
ECM code shows ERR

This all took place after replacing the heater core myself, on the initial start after the heater core replacement. I am not sure what the DTC 41 code on the CCM is, and it appears that the ECM is not responding to the CCM request for error codes. Module 9 and module A are also giving the ERR on the code scans.

Any suggestions?

Thanks,
Tom

Tom76043 wrote: On reassembly of the heater core replacement, I made a mistake with the two large wire harness connectors in the passenger side foot well and got the two connectors crossed. The car would not do anything when I reconnected the battery, no ignition power and I started checking the wiring harnesses I had disconnected. That is when I found the two connectors were crossed and corrected that problem. The car started right up but died in about 15 seconds. It will start right up every time but will not continue to run. I did not pull the CCM or any connections at the CCM. What is the chance that crossing the wiring harnesses fried the PROM in the ECM? Can the PROM be replaced, or do you have to replace the whole ECM? 95 Corvette, Tom

Tom76043 wrote:
Would a failed ECM/PCM cause the communication failure on module 9 also? If I disconnect the battery and then reconnect the battery, the CCM will give me a C12 just before it gives the C41 code. This makes me believe the CCM is OK.

Tom

bogus wrote:
There is a chance that the CCM and or the PCM were fried by that crossing of connectors. I am actually surprised they allow that to happen, GM never puts the same connector next to each other like that.

>

Tom76043 wrote:
That is correct. I am jumpering 4 to 12 on the DLC and reading the codes on the speedometer. the 41 code is from module 1 (CCM) and the rest of the modules give the Err. I have a set of FSM for a 93 and a new set for the 95 was ordered last week and should get here soon. I know there are differences, but don't know all the details of the differences. I have an OBDII code reader, but don't think it would work on the 95, and probably don't need it with the ability to read from the vehicle. I can get one if it is necessary.

Tom
95 LT1 Coupe

The FSM (92) does have a blip on forcing the connectors together and possible resulting damage (check "CCM" in your 93 FSM, should be in 8C-whatever page). Of course it doesn't say jack about what to do if you cross the connectors.

Tom76043 wrote:
Bill,
I am not getting the service engine soon light. Everything is normal except for the SYS pop up on the speedo when you turn on the key.

Tom

Tom76043 wrote:
Back home now.
No SES light at any time. But still the SYS on the speedo when placing the key in run.

Tom

Tom76043 wrote:
Bill,
The test light will come on for circuit 419. This is the plug side (wiring side) of the connection.

Thanks,
Tom

bogus wrote:
I am actually surprised they allow that to happen, GM never puts the same connector next to each other like

Arisa wrote:
Quote:

bogus wrote:
I am actually surprised they allow that to happen, GM never puts the same connector next to each other like

Like hell they don't !!!!

The four pin IAC and ignition control plugs on Arisa are IDENTICAL, same color and length from the breakout of the wiring harness.

How do I know? Two weeks of hell when I rebuilt her in '01. Spent damn near a grand replacing stuff that might have gone wrong during install. Finally found it cause I tore the wiring harness apart tracking wires to see if I had cut one.

Tom76043 wrote:
Been about a week since pcm replaced. No problems, runs great and no rattles from the dash! I think that pcmforless got rid of the one to four lockout in the new pcm. In any case, it is not coming in and that is worth the entire cost of the pcm replacement IMO.
I have the old pcm and wondering if I should find someone to rebuild and hold for future problems?

Thanks,
Tom