90 7.3idi dually. dually is in limp mode currently. It sat for a while because i didn't have time. im about to swap a vss in as I had already been planning too as it tested in the 1700 range instead of 1200-1500 because it originally got parked in limp mode and I lost speedo while it was parked apparently along with my brakes blah blah blah but the real problem is I cant get my code flashouts and im trying to figure this out desparately. I have a scanner. The cheapo innova. I've tryed also just trying to use a test light and tryed watching the check engine light but the scanner won't communicate and the check engine light isn't working. I know it used to but now it won't light up at all even for the split second when you first turn the key on. I want to fix this so I can get my code flash out but unsure how to proceed I've been scavenging all the forums for hours upon hours and havnt found anything specifically about this particular problem except one guy with a similar thing going on who never figured it out. I tryed to order another tcm and when i swapped it still the same limp mode and no CEL code flashout. I have tryed cutting back the wire a lil for fresh wire and repinnig the EEC IV connector to see of it was just bad connection because those ends did look a bit corroded and I got nothing still. I tryed to see if maybe the bulb looks burned out for CEL and pulled front of dash off to look at bulb but it doesn't look bad. Looks just the same as the others next to it that all work. Once I figure out gettin my fingers in there I was gonna try and swap for another bulb to test but i suspect my problem is elsewhere electrically. I have questions. Does the eec iv plug go straight to the tcm. Does this CEL light just go through a plug at back of cluster and that goes to where? Straight to the tcm plug? That is the one wiring schematic I havnt found that I needed to know what wire colors im looking for and my pathway. Anyone have any ideas or advice its appreciated gettin super frustrated cause I can even use diagnostics for my limp mode cause there's an issue with diagnostics to fix lol Thanks.
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