Nissan Repair Questions? Ask a Mechanic for Answers ASAP
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When the IACV/AAC Valve fails on this vehicle, it almost ALWAYS damages the ECU. You should be able to easily find the burnt area of the ECU when you remove the cover from the ECU. You will need a new or used good ECU reprogrammed and installed into your vehicle if this is indeed the case.
Sure, below are some troubleshooting procedures to follow to eliminate possible culprits. Let me know how the tests come out.
Okay, try the Idle Air Volume Learning procedure. First go over these preconditioning steps.
Ensure the following conditions are met:
Battery voltage greater than 12.9 volts at idleEngine coolant temperature between 158 - 210 F Transmission is in PARK or NEUTRALElectrical loads (i.e. A/C, headlamps, etc..) are turned offCooling fan motor is not runningSteering wheel is straight ahead or in a neutral positionVehicle is stoppedTransmission is warm
The learning procedure will be cancelled if any of these conditions are missed, even for a moment.
Now the learning procedure is as follows:
Turn ignition switch ON. Wait at least one second. Turn ignition switch OFF. Wait at least ten seconds.Start engine. Warm up to normal operating temperature. Turn ignition switch OFF. Wait at least ten seconds. Start engine and let idle for at least thirty seconds.Disconnect Throttle Position (TP) sensor harness (brown), then reconnect it within five seconds. Waite twenty seconds.Ensure idle speed is within specs. If idle is not as specified, result will be incomplete. Rev engine two or three times. Ensure idle speed and ignition timing are within spescs. If idle speed and timing are not as specified, let me know for further troubleshooting procedures.
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