Nissan Altima 2007-2012 Service Manual: Symptom diagnosis

UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIATION)

Description

• Hard steering when fully turning the steering wheel.

• Light steering when driving at a high speed.

Diagnosis Procedure

1.CHECK SYSTEM FOR POWER SUPPLY AND GROUND

Perform trouble diagnosis for power supply and ground circuit. Refer to STC-6, "Diagnosis Procedure".

Is the inspection result normal? YES >> GO TO 2.

NO >> Repair or replace damaged parts.

2.CHECK SYSTEM FOR VEHICLE SPEED SIGNAL

Perform trouble diagnosis for vehicle speed signal. Refer to STC-13, "Diagnosis Procedure".

Is the inspection result normal? YES >> GO TO 3.

NO >> Repair or replace damaged parts.

3.CHECK SYSTEM FOR ENGINE SPEED SIGNAL

Perform trouble diagnosis for engine speed signal. Refer to STC-10, "Diagnosis Procedure".

Is the inspection result normal? YES >> GO TO 4.

NO >> Repair or replace damaged parts.

4.CHECK SYSTEM FOR POWER STEERING SOLENOID VALVE

Perform trouble diagnosis for power steering solenoid valve. Refer to STC-8, "Diagnosis Procedure".

Is the inspection result normal? YES >> Perform the symptom diagnosis for the steering system. Refer to ST-3, "NVH Troubleshooting Chart".

NO >> Repair or replace damaged parts.

    ECU diagnosis
    POWER STEERING CONTROL UNIT Reference Value TERMINAL LAYOUT PHYSICAL VALUES CAUTION: When using circuit tester or oscilloscope to measure voltage for inspection, be sure not to extend for ...

    Precaution
    Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSION ...

    Other materials:

    Key cylinder switch
    Description For vehicles equipped with LH and RH anti-pinch system, the main power window and door lock/unlock switch detects condition of the door key cylinder switch and transmits to BCM as the LOCK or UNLOCK signal. For vehicles equipped with LH anti-pinch system only, the front door loc ...

    CVT position
    Inspection and Adjustment INSPECTION 1. Place selector lever in “P” position, and turn ignition switch ON (engine stop). 2. Make sure that selector lever can be shifted to other than “P” position when brake pedal is depressed. Also make sure that selector lever can be shifted fro ...

    Removal and installation
    REAR SUSPENSION ASSEMBL Exploded View 1. Cap 2. Shock absorber insulator 3. Shock absorber seal 4. Bound bumper 5. Shock absorber 6. Suspension arm 7. Connecting rod mount bracket 8. Connecting rod 9. Upper rubber seat 10. Coil spring 11. Lower rubber seat 12. Knuckle 13. Knuckle bus ...