DTC codes

udidwht wrote:

rgatijnet1 wrote:
Maybe this will help: OBDI codes

Thanks but I had someone tell me that some codes may or may not be for my chassis. For instance code 68 is trans slip but on your link it shows as:

Code 68 A/C clutch relay circuit error (shorted to ground)

I know this as it was a code that threw when I had the trans serviced for the shift solenoids, wire harness and force valve turned up.

As for code 35 I do believe it relates to the IAC. I replaced both the IAC and the Idle speed control actuator when I originally had the code 35 appear ~ 1 year or so ago. Have not had that code or SES light since then. Back when it happened the first time it flashed the same 3 codes 35, 68 and 71.

I had another person tell me he was not able to reference (service manuals) a code 71 for my chassis but it did show for the 1994 diesel relating to cruise control item.

The problem with these generic codes is that they are very unreliable in troubleshooting engines with an OBD 1 system, you can find may conflicting ones on the internet. There are no code readers like OBD2 and OBD1 codes are specific to individual ECU's. There was a guy on here years ago that had a program on his laptop that connected with a VGA cable that had the same ECU as me that was very helpful in diagnosing these codes.