What inputs cause ECU to send injector ground
#1
What inputs cause ECU to send injector ground
What inputs cause the ECU to make the switch to send ground to the injectors making them fire?
I am troubleshooting a no start issue documented here:
https://www.yotatech.com/forums/f116...-start-251387/
Also is there anyway to verify the output of the ground signal from the ECU to the injector? I have unwrapped the harness and verified the wiring between the injectors and the ECU and reran the grounds for the ECU direct to the battery.
Swapping in a new ECU didn't help so trying to figure out what's keeping the injectors from firing, including the cold start injector.
Matt
I am troubleshooting a no start issue documented here:
https://www.yotatech.com/forums/f116...-start-251387/
Also is there anyway to verify the output of the ground signal from the ECU to the injector? I have unwrapped the harness and verified the wiring between the injectors and the ECU and reran the grounds for the ECU direct to the battery.
Swapping in a new ECU didn't help so trying to figure out what's keeping the injectors from firing, including the cold start injector.
Matt
#2
Registered User
I am chasing same problem, have good spark and runs on eather, fuel pressure to rail but no gas to cylinder. New engine, wondering if I missed a connection somewhere
#3
Registered User
Also is there anyway to verify the output of the ground signal from the ECU to the injector?
If nothing is firing, I would start my continuity checks at the EFI fuse, EFI main relay, solenoid resistor if your truck has one, and the Wiring to the ECU.
Jagman60, you say you are getting fuel pressure to the rail, but is it enough fuel pressure for the engine to start? I'd install a temporary fuel pressure gauge to see if it is within spec.
Last edited by Hadmatt54; 04-22-2012 at 02:47 AM.
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