Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Hello my name is ***** ***** thank you for your question.
When you turn the key to the ON position, the fuel pump only comes on for 3 seconds. You would need to turn the engine over to properly check it's voltages
The ground is not Ecm controlled, you are correct on that. You should have a constant ground at the Fuel pump.
I take it the truck turns over and doesn't start? Do you know if you have any codes?
The Ground for the fuel pump relay is ECM controlled. That is the White wire with the Red Stripe
But in order to check that, the engine needs to be turning over to see if that signal is being grounded. Turning the key ON it will only ground for like 3 seconds
Hi Im David, If the ECU doesn't respond with a ground, and it is also missing on ECU then perhaps it is not getting the IGN ON signal to the ECU . If the ECU is getting the IGN ON but doesn't respond with a ground for the fuel pump relay then it could only be either a bad ECU ground or the ECU itself. there is no other sensor input it depends on.
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