Replaced ECM with a remanufactured one and truck runs perfectly.
Hi,
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> My truck has no fuel and no spark. The ASD and fuel pump relays both
> tested good and have power at the connectors. The first time it wouldn't
> start for me, with key on the relays would rapidly click on/off while the
> check engine light flashed in sync with them ...the relays don't click
> anymore and the check engine light will not come on at all. I did verify
> that there was power and ground at the ECM harness (but I don't know which
> pins are supposed to be what). Is it likely that ECM itself has failed?
> If so, do they just fail on their own, or is there likely a short or
> something that will fry another one if I replace it?
>
> Thanks for any advice,
> Its a 1992 5.2L MPFI, around 225k miles
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