Jeffrey Bandel
Senior Member
That's my plan
Not sure about that. The black C249 wire is basically a signal wire to the ECM. The ECM reads the return voltage on this wire and converts that to a temperature reading, so I'm not sure if your quick check is actually checking anything other than the F421 yellow wire. I could be wrong.Sounds like I have a grounding issue in the harness.
I'd be double checking your wire numbers stamped into the ECM plug and also make sure you're looking at the correct ECM. If still unsure you can always confirm they are the correct wires by doing continuity tests with your multimeter.My slots in my ecm for pins 23 and 33 are not yellow and black. They are orange and green.
To clear it from a "logged" state yes. In ET you need to uncheck the "select all ECM's" button.if your getting the -3 event code i believe the only way to clear it is with et.
But if you find & fix the problem it will turn the current Active Diagnostic Code to a Logged one which will sit quietly in a corner of the ECM memory not bothering anybody.if your getting the -3 event code i believe the only way to clear it is with et.