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'92 GTP - Pulled motor, now no ALDL scan data


crazyd
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Hi all,

 

The short story is I pulled the motor on my '92 GTP for a clutch job and I noticed my DIC is showing "CK. FUEL" with no speed/range/econ data available. I ran DIC diagnostics on it, and the 1st two digits agreed with my fuel level, but the 7th digit is showing an X instead of S, meaning an ECM serial data failure. So I tried connecting my Snap-On MT-2500 scanner to the ALDL line. It gets power, but can't connect to the ECM in scanning mode. I pulled it off and tested shorting the A&B ALDL pins, and the dash flashed the 1-2 code series to say everything's OK. The manual says that I should check my wiring on the orange 461 wire for short or open, but I haven't messed with anything in there lately and as far as I can tell it looks OK under the dash, and also from the firewall harness connector back to the ECM. I doubt it would be a problem in the DIC itself, but haven't ruled that out. Anyone else ever had this happen before? Is there another point where I can do continuity tests on that wire to figure out what's going on?

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