Nissan Repair Questions? Ask a Mechanic for Answers ASAP
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Does the radiator fans come on as soon as the ignition is turned on?
Give me a few to review all these codes.. I have some thoughts.. but would like to review this before I say my thoughts.. Hang on please...
The P0451 is a Evap pressure sensor code. The Evap pressure sensor shares a 5 volt reference with the APP sensor. Try unplugging the Evap pressure sensor and see if throttle operation returns.
That could also be causing the APP sensor code as well...
and the P643 for power supply for App sensor..
Do you know where this sensor is located?
That is the APP sensor.. Do not touch that. Start with the Evap pressure sensor. That is located on the Evap canister which is in the center of the rear of the car. Right above the sub frame.
That could be factory
App sensors I don't see go often. Most cases the AC pressure sensor or the Evap pressure sensor which shares the APP 5 volt reference causing the App codes and throttle issues.
Since you have a Evap Pressure sensor code, that is where I would start. It mounts up high on the canister, above the vent control valve.
Sure take your time. You may need to lower the rear sway bar to get your hand up there..
If I remember right..
The codes wont' clear.. But take it for a ride and see if throttle response returned..
Then tests need to be done to see if your getting the 5 volt reference at the APP sensor.
Are you sure you unplugged the Evap pressure sensor? There is vent control valve back there also that is on the canister.
It should be a 3 wire connector at the evap pressure sensor. The vent control valve is only a 2 wire connector.
Yes.. Leave it unplugged for now.. Do you have a volt meter and can you follow diagnostic steps?
Give me a few and I will put together all the diagnostic steps for the codes you have.. Hang on please.. Give me a few..
I put all the Idle relearn steps on the last page of the info.
That is all the diagnostic steps for all 3 codes you have...
If you have any more questions on this, please feel free to ask.
If not, and you're satisfied with my help, please Rate me. That is how I get credit for my work. I hope I have provided you with Excellent Service.
That means with Dash removed.
Do you have any more questions on this?