Hello,

I did some searching and couldn't find much on this, but I apologize if this is an easy one. I have an 84 T/A 5-speed, stock.

My check engine light won't come on at all, not at start and not if I put in a jumper for the diagnostic test. The ECM fuse is ok. I pulled the gauge cluster and the light bulb is not burned out. I've pulled out the ECM and all the wiring looks to be in good shape - nothing obviously loose.

What else should I check? Even if the ECM was toast, I should still get some flashing of the CEL when I put in the jumper, should I not? I appreciate any advice!

Thanks in advance,
Steve

 

How did you test the bulb? If bulb test good and acually lights, then maybe its the wireing to the bulb.

 

Thanks - I just visually checked the bulb but I will replace it just in case. I have a couple other burned out dash bulbs anyway.

When I said I checked the ECM fuse, that was just the one under the dash and after searching some more, I realized there is apparently an inline fuse for the ECM under the hood on the passenger side? Now I just need to find it...hopefully it's as simple as that.

Steve

 

Does the car run Ok? Or is it just the light not working.

 

This sounds like you need to take a look at the lamp driver 12020004 acdelco 216-51. Refer to a fsm for a schematic .