The truck would not start after parking from a short 15 minute drive. When the key was turned to on, the usual 1-2 second fuel pump prime did not happen. I checked the fuel rail and there was no pressure at the Schrader valve. I checked the fuses – all good. After checking anything else I could with limited tools in a Home Depot parking lot, I tried once more to start it and heard the fuel pump prime! It started hesitantly but leveled off and I was able to get it back home and parked. Immediately after turning the engine off, I tried to start it again with no luck.
It’s been a few weeks of troubleshooting when I can after work but I’ve reached a point where I’m not sure what to check anymore. The ECM was replaced about 10 months ago with a refurbished from a reputable auto parts store (not the Zone or Reilly’s) due to moisture corrosion on the original. It ran fine for months after replacing with the refurb and I did my homework to make sure the replacement was an exact match for my truck, so I don’t think the issue is an incorrect ECM.
I ran an EEC-IV self-test and got:
Code 11 – System Pass
Code 95 – Fuel Pump secondary circuit failure – PCM to GROUND
What’s been done/other tests
-Replaced Fuel pump relay
-Tested EEC relay (passed)
-Tested Fuel Pump by jumping with 12v (passed)
-No power on either side of inertia switch with key on (12v show for under 1 sec with initial key on but no fuel pump noise)
-When fuel pump pins are jumped on the self-test harness, 12v on both sides of inertia switch with key on and while cranking, but no fuel pump noise and no pressure at rail
-Checked all wiring and ground locations and everything looks okay
-Looked inside ECM and no signs of moisture or burned components
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Thursday, June 4th, 2015 AT 2:06 PM
