Yesterday I swapped in a new PCM relay in the relay/fuse box. Car started right up and I thought it was fixed.
10 degrees. It failed at the grocery store this morning.
I knew when I didn't hear the pump when I turned on the key that there was a problem, and of course it didn't start. Sat there for about 15 minutes, trying it every couple of minutes. Then I heard the pump and it fired right up.
Summary
If the pump won't run, it won't start. (Obviously)
When it does start, the pump never fails to run. Never shuts off while driving.
While I can't say for sure, I think the pump is fine based upon those observations.
Guess next I'll meter at the inertia switch and make sure there is power back to it. If there is, the pump (or wiring harness) must be bad. If not, it must be ahead of the inertia switch.
I'm leaning to the PCM or a sensor that sends a needed command to it. I wish I knew what sensor could send or not send the needed signal to the PCM. Anyone know where I can find a diagram of the wiring to the PCM and sensors? Maybe I'll unplug/plug-in the connectors on the relay box and PCM
Wednesday, May 20th, 2020 AT 1:05 PM
(Merged)