crazyd Posted November 30, 2014 Report Share Posted November 30, 2014 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? Quote Link to comment Share on other sites More sharing options...
Schurkey Posted November 30, 2014 Report Share Posted November 30, 2014 Are all the fuses good? How does the engine run? Quote Link to comment Share on other sites More sharing options...
crazyd Posted December 1, 2014 Author Report Share Posted December 1, 2014 Are all the fuses good? How does the engine run? The engine runs flawlessly. I'd considered fuses, but it would help to narrow it down to one specific fuse before checking every one of them. Quote Link to comment Share on other sites More sharing options...
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