F115 - no signal to #2 injector

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pbob42

Seaman
Joined
Jul 14, 2023
Messages
53
Tested with a NICO light - 1, 3 and 4 all good, 2 no good. Figuring harness or ECU. Anyone have experience with this?
THX
 
J

Jeff J

Petty Officer 1st Class
Joined
Jun 23, 2021
Messages
283
Sometimes disconnecting and reconnecting a harness can get things working. If that fails then I would do a continuity check on the wire followed by checking for the signal coming from the ECU.
 
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boscoe99

Commander
Joined
Aug 22, 2013
Messages
2,137
By signal I presume that the ground wire is not completing the circuit when it should?

And that the injector itself is known to be working?

Have you verified continuity on the ground wire from the injector to the ECU?
 
P

pbob42

Seaman
Joined
Jul 14, 2023
Messages
53
Swapped out the harness - didn't fix it. When you talk about continuity, just ohm out the leads going from the ecu to the injecter? If the wires are good and there is no signal at the NICO, does that mean there is no signal from the ecu?

Next step - ecu
 
9

99yam40

Fleet Admiral
Joined
Sep 7, 2008
Messages
9,171
sounds to me like Boscoe says the injectors should have power all of the time but the ECU fires them by furnishing the ground
 
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