Nissan Repair Questions? Ask a Mechanic for Answers ASAP
hey there, any other weird symptoms? like condensor fan coming on with key to ON or anything of that nature?
Does the service engine light flash also?
when you try to restart? does the service engine light flash?
If you turn the key to ON, does the red car/key light come on solid?
Please answer my last question. thanks
Thanks, I'll explain my concerns here.
The fuel pump circuit is fairly simple on these trucks. A 15a fuse in the IPDM provides power to the relay in the IPDM that is switch on by the ECM. Power runs directly through that relay out the IPDM and to the pump. So you can easily check with a voltmeter to see if you have power leaving the IPDM.
The condenser fan coming ON indicates "fail safe" mode. This happens when a control unit is not responding. This could be from a control unit failure or power to a control unit.
So at this point your best bet would be to verify all the fuses and links are good under the hood and at the battery. If all are good then you need to use your scan tool to see which control unit is not responding.
More common then not on these trucks it's the IPDM itself that fails. "Sometimes" when the IPDM fails it can dump excessive amounts of fuel into the exahaust so once it's replaced and started it throws a catalyst code shortly after.
Let me know how you would like to proceed.
Terminal 13, black and yellow wire.
You have to back probe with the connector plugged in and then run to ON and look for voltage to show up temporarily.
That wire DOES run to the fuel pump yes.
Your testing it leaving the IPDM to make sure there is not a short from the IPDM to the pump though.
Well if you getting power at the fuel pump, then it would be running unless it was bad or you had a bad ground.
If that was the case you would be getting fuel UNLESS you didn't have injector pulse. The only thing that cuts injector pulse is the security system and control module failure. You would still be able to get it to start temporarily off starting fluid though if it was a fuel issue.
Your symptoms tell me that you likely have an ECM or IPDM failure at this point.
You could try and switch the ECM and fog lamp relays just to try and see if it helps, but at this point it's not looking promising.
You CANNOT unhook the plug to test for power coming out. Power runs though it FROM the IPDM. When you seperate it from the IPDM of course there is no power. Thats why I said to back probe it and have someone turn the key to ON.
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