09-14-2017, 05:33 AM
what's up doc?
welcome.
oops the fuel pump relay is not energizing
does the CEL lamp glow key on, it must. or ECU has no power. no power no pump.
no its only there cranking and only for 3 second key on, its 2 man test, never 1. or jumpe wires to pink wire to cab. and 1 man test.
this is a no crash and burn features, on all cars,
normally turn on key, to on hear pump run for 3 seconds and it quits, 91 to today. (odd expections on j18, engine , not upgraded )
if the pink wire never goes hot during key one or cranked the relay is next
but for sure CEL lamp
if the fues blew (there are 3 ECU fuse)
if they blow the pump goes dead,(not dome fuse )
dome fuse blown causes ECU to forget,
FI fuse kills pump
IG-CoIL calls ECU and PUMP.
yes that bank of relay can interchange ,see same pn. yes.
most are.
now some odd things,
the key one 3 second rule is al rule.
but the cranking , , if you crank the engine , the ECU may cut the fuel pump if any CODE p03xx happens for sure CMP dies.
it dont want you to fill the engine full of raw fuel and hydra lock the cambers and bend the rods (over 55 cc of fuel will do that, combustion chamber size, .
since your pump fails at key on, 3 second its not the CMP error.
CEL lamps (you said lamps on but that CEL is what matters no other lamps)
the check engine light or Service engine soon, SES lamp . must glow and is always first check then FI.
The ECU can be bad too. blown caps, leaking
welcome.
oops the fuel pump relay is not energizing
does the CEL lamp glow key on, it must. or ECU has no power. no power no pump.
no its only there cranking and only for 3 second key on, its 2 man test, never 1. or jumpe wires to pink wire to cab. and 1 man test.
this is a no crash and burn features, on all cars,
normally turn on key, to on hear pump run for 3 seconds and it quits, 91 to today. (odd expections on j18, engine , not upgraded )
if the pink wire never goes hot during key one or cranked the relay is next
but for sure CEL lamp
if the fues blew (there are 3 ECU fuse)
if they blow the pump goes dead,(not dome fuse )
dome fuse blown causes ECU to forget,
FI fuse kills pump
IG-CoIL calls ECU and PUMP.
yes that bank of relay can interchange ,see same pn. yes.
most are.
now some odd things,
the key one 3 second rule is al rule.
but the cranking , , if you crank the engine , the ECU may cut the fuel pump if any CODE p03xx happens for sure CMP dies.
it dont want you to fill the engine full of raw fuel and hydra lock the cambers and bend the rods (over 55 cc of fuel will do that, combustion chamber size, .
since your pump fails at key on, 3 second its not the CMP error.
CEL lamps (you said lamps on but that CEL is what matters no other lamps)
the check engine light or Service engine soon, SES lamp . must glow and is always first check then FI.
The ECU can be bad too. blown caps, leaking
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