John95z28

In an earlier thread a condition was discussed where the check engine light would come on and off depending on throttle position. Sometimes the light would come on at idle, and sometimes come on at throttle. There were no codes present when checking for DTC's. Several scanners were used including a Snap on with recent updates. Even the dealership recommended that I replace the PCM since they could not retrieve a code but saw the SES light.

One of two things solved the problem.
A. I changed the air filter.
B. I changed the fuel filter.

The air filter was very very dirty and is the main suspect.
The fuel filter was due for a change but had no obstructions or material inside. The fuel pressure had been checked at 38-43, so it is doubtful that it was causing the SES light.

RamAir95TA

Anyone that suggests immediately replacing the PCM doesn't know what they're doing.

I would also immediately suspect that just about every scanner they tried was an OBDII style. Not many people know that a 95 is OBDI but has an OBDII plug. If the SES comes on a code is stored. There is no exception to the rule.

John95z28

I agree the dealer just wanted to charge more money obviously. They had a proper scanner for ODB1 95. The snap-on used by a master mechanic at a diagnostic shop also was proper at reading odb1 through the odb2 tool(inline key). The snap on read the AIR pump code, but DID NOT READ why the SES was coming on/off with throttle position. I realize you are under the impression that there is no exception, but my post is to solely to illustrate that there is indeed at least one exception.