11-16-2018, 05:25 PM
No takers yet eh?
If I get this resolved I will return to share the cause.
Short version
FP not priming for three seconds, or at key on.
Main relay good .
Power to do relay where it should be.
Continuity on pink wire from ecm to FP relay
FP relay not closing.
Seeing 4.65v at ecm pin for three sec at key on the 0v with relay disconnected.
Possible causes (educated guesses).
12v at key on (all times with relay connected) tells me that the ecm is commanding the relay open(no power to fp) I've read that it should read 0v to trigger the fuel pump and then float to 12v when commanded off. Why would the ecm cut fuel at prime, before start?
Bad input or short in ecm harness.(no idea where)
Stuck in unflood mode(does this kill 3 second fp at key on?)
Bad ecm.
Bad component shorting ecm.
No how to diagnose from here.
96 are slightly different animals than most.
Thanks again.
Sky
If I get this resolved I will return to share the cause.
Short version
FP not priming for three seconds, or at key on.
Main relay good .
Power to do relay where it should be.
Continuity on pink wire from ecm to FP relay
FP relay not closing.
Seeing 4.65v at ecm pin for three sec at key on the 0v with relay disconnected.
Possible causes (educated guesses).
12v at key on (all times with relay connected) tells me that the ecm is commanding the relay open(no power to fp) I've read that it should read 0v to trigger the fuel pump and then float to 12v when commanded off. Why would the ecm cut fuel at prime, before start?
Bad input or short in ecm harness.(no idea where)
Stuck in unflood mode(does this kill 3 second fp at key on?)
Bad ecm.
Bad component shorting ecm.
No how to diagnose from here.
96 are slightly different animals than most.
Thanks again.
Sky