Nissan Altima (L32) 2007-2012 Service Manual ≻ Steering control system ≻ Symptom diagnosis

Nissan Altima (L32) 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

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Other materials:

Steering wheel
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Programming trouble-diagnosis
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Radio
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