where is my PCM?

firstruck · May 17, 2005

I was thinking the other day that some of the engine noises I hear could be the result of using to low an octane gas if my "new to me" truck has a tuning chip installed. Where do I look to find the PCM(?) and verify if its stock or not? TIA

99-2door · May 17, 2005

Om your 2001 the PCM will be near the front of the engine compartment, left of the fan shroud. It is mounted in a plastic bracket and has a black plastic cover on it.

96-up trucks don't have a replaceable PROM/Chip and musted be tuned. You won't be able to tell by looking at it if it has been tuned.

firstruck · May 17, 2005

Om your 2001 the PCM will be near the front of the engine compartment, left of the fan shroud. It is mounted in a plastic bracket and has a black plastic cover on it.
96-up trucks don't have a replaceable PROM/Chip and musted be tuned. You won't be able to tell by looking at it if it has been tuned.

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OK, Thanks 99. So if I wont be able to tell by just looking at it, then is there another way to tell if I've been "tuned"? I have an OBD II reader might that be able to tell me? Wouldn't a tune have some identifing mark?