Diagnosis Chart By Symptom 2

TROUBLE DIAGNOSIS


Diagnosis Chart by Symptom 2

The steering force does not change smoothly according to the vehicle speed (Heavy steering force with the vehicle stopped/Light handle operation during high-speed driving)
1.CHECK (1): POWER STEERING SOLENOID VALVE SIGNAL
1. Start engine.





2. Change the vehicle speed from 0 to 100 km/h (0 to 62 MPH) slowly, and then check voltage RAS control unit harness connector B476.

Terminal 36 - 34 : The voltage has changed from approximately 4.4 - 6.6 V to approximately 2.4 - 3.6 V.

OK or NG
OK - GO TO 2.
NG - GO TO 7.
2.CHECK (2): POWER STEERING SOLENOID VALVE SIGNAL
1. Activate fail-safe function by running engine speed at 1,500 rpm or higher for 10 seconds with the vehicle stopped.





2. Change the engine speed to the idling speed, approx. 1,600 rpm, and approximately 3,000 rpm slowly, and then check voltage RAS control unit harness connector B476.

Terminal 36 - 34 : The voltage is changed from approximately 5.5 V to approximately 2.1 V step-by-step.

OK or NG
OK - GO TO 3.
NG - GO TO 7.
3.CHECK POWER STEERING SOLENOID VALVE CONNECTOR
Turn ignition switch OFF, disconnect power steering solenoid valve harness connector, and check terminal for deformation, disconnection, looseness, etc.
OK or NG
OK - GO TO 4.
NG - Harness or connector open or shorted. Repair or replace any inoperative parts.
4.CHECK POWER STEERING SOLENOID VALVE POWER SUPPLY CIRCUIT





Check continuity between RAS control unit harness connector B476
(A) and power steering solenoid valve harness connector F25
(VQ35HR), E211 (VK45DE) (B).





OK or NG
OK - GO TO 5.
NG - Open or short in harness. Repair or replace any inoperative parts.
5.CHECK POWER STEERING SOLENOID VALVE GROUND CIRCUIT





Check continuity between power steering solenoid valve harness connector F25 (VQ35HR), E211 (VK45DE) and ground.

Terminal 2 - Ground : Continuity should exist.

OK or NG
OK - GO TO 6.
NG - Open or short in harness. Repair or replace any inoperative parts.
6.CHECK POWER STEERING SOLENOID VALVE





Apply voltage power steering solenoid valve connector F25
(VQ35HR), E211 (VK45DE) and then make sure that the operating sound (clicking sound) is heard.

Terminal 1 (+) - 2 (-) : Operating sound is heard.

OK or NG
OK - Perform steering wheel turning force inspection. Refer to Procedures.
NG - Power steering solenoid valve is malfunctioning.
Replace it.
7.CHECK SELF-DIAGNOSIS RESULTS

Perform RAS self-diagnosis.
- With CONSULT-III: Consult-III Function (RAS/HICAS).
- Without CONSULT-III: Diagnosis Procedure With Self-Diagnosis Function (Without Consult-III).
Are malfunctioning items displayed in self-diagnosis results?
YES - Repair or replace any malfunctioning items.
NO - RAS control unit malfunctioning. Replace it.