2004 ZO6 No signal to fuel pump,
02-21-2018, 09:06 PM
#1
2004 ZO6 No signal to fuel pump,
my c-5 2004 zo6 stopped running.Sent the PCM out to be refurbished also the ABS module,it was throwing traction control codes.Reinstalled both modules,erased all codes,except PO315(re-learn timing p.u.) still wont start.Towed it to Chey Dealer.After $300 diagnostic,they say" replace fuse block,fuel signal not reaching connection412,to fuel pump".It's turning into a money pit.Even if Ijump a hot lead to'click' on relay,hot to f-pmp gets no pressure.Could it be the fuse block? Forgot to mention,engine will fire up briefly,if I spray a little carb cleaner into throttle body intake,so it's getting ignition pulses.Thanks.
Last edited by Mr.Zee; 02-21-2018 at 09:22 PM. Reason: had to add important fact
02-21-2018, 11:35 PM
#2
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02-22-2018, 06:09 PM
#3
Melting Slicks
Have you thought about running a separate 12v wire to the fuel pump just to prove theory, also check your wiring harness to the fuel pump and connections at the fuel tank. Good luck.
02-23-2018, 05:44 PM
#4
Does it prime on ACC? Check fuse, and Try jumping pins 87 and 30 on the fuel pump relay. If it works, check the splice pack ground under the battery tray, SP122. It is taped with electrical tape to a wire harness so youll need to undo it. This was my problem, it was completely corroded.
Also check grounds G105 and G106 on the Engine block.
Also check grounds G105 and G106 on the Engine block.