Hi,
Often a single issue can trigger multiple diagnostics codes, especially if the circuits are closely related.
Code P0100 = Mass Air Flow (MAF) Circuit malfunction
The computer has detected an issue with the MAF sensor.
- Verify the MAF sensor wiring is connected and wiring is in good condition
- Unplug and reconnect the MAF harness
- Check that voltage to the MAF sensor is within factory spec
Code P0325 = Knock Sensor # 1 Circuit malfunction
A knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged. The computer uses this information to tune the engine so that it doesn't knock. If your knock sensor wasn't operating properly, so that it was always indicating a knock, the engine computer's response may have been to change the ignition timing on your engine. Knock sensors generally bolt into or thread into the engine block.
- Check condition of the knock sensor wiring.
- Test the 'Ohms' reading of your Knock Sensor (undo the connector and measure the pins) to ensure it is within spec (ask Nissan for this measurement). If out of spec, replace the knock sensor.
Cheers,
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A/T Diagnosis Communication Line Malfunction Possible Causes:
Trouble Code: P0100
Mass Airflow Sensor Circuit Malfunction
Possible Causes:
Air Intake leaks located after the MAF sensor assembly
MAF sensor signal circuit is open, shorted to ground or power
MAF sensor has failed
PCM has failed
Trouble Code: P1605
TCM communication line circuit is open or shorted to ground
TCM communication line circuit shorted to VREF or power (B+)
TCM or PCM has failed
TSB 01-004 (01/01) contains information related to this code
For the P0100, check the connector on top of the MAF sesnor for looseness or corrosion. Connector is on top in piocture below.
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