Nissan Altima 2007-2012 Service Manual: Function diagnosis

NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTING

NVH Troubleshooting - Engine Noise

Use the Chart Below to Help You Find the Cause


Use the Chart Below to Help You Find the Cause of the Symptom

1. Locate the area where noise occurs.

2. Confirm the type of noise.

3. Specify the operating condition of engine.

4. Check specified noise source.

If necessary, repair or replace these parts.

On-vehicle maintenance


    Preparation
    Special Service Tool The actual shapes of the Kent-Moore tools may differ from those of the special service tools illustrated here. Commercial Service Tool ...

    Other materials:

    Drive belt
    QR25DE eng 1. Crankshaft pulley 2. Drive belt Automatic tensioner 3. Water pump pulley 4. Alternator 5. Air conditioner WARNING Be sure the ignition switch is placed in the OFF or LOCK position before servicing drive belt. The engine could rotate unexpectedly. 1. Visually inspect the be ...

    Turn signal lamp circuit
    Description The BCM monitors inputs from the combination switch to determine when to activate the turn signals. The BCM outputs voltage direction to the left and right turn signals during turn signal operation or both during hazard warning operation. The BCM sends a turn signal indicator req ...

    Cooling fan control
    System Diagram System Description INPUT/OUTPUT SIGNAL CHART *1: The ECM determines the start signal status by the signals of engine speed and battery voltage. *2: This signal is sent to ECM through CAN communication line. SYSTEM DESCRIPTION ECM controls cooling fan speed correspondin ...