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 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.
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 ...