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  .

      Fig 1: Checking Voltage RAS Control Unit Harness Connector B476

      Courtesy of NISSAN MOTOR CO., U.S.A.

      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  .

      Fig 2: Checking Voltage RAS Control Unit Harness Connector B476

      Courtesy of NISSAN MOTOR CO., U.S.A.

      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).

   CONTINUITY CHART
   
   

   RAS C/U	Power steering solenoid valve	Continuity
   Terminal 36	Terminal 1	Yes

   Fig 3: Checking Power Steering Solenoid Valve Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.

   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  .

   Fig 4: Checking Power Steering Solenoid Valve Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.

   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  .

   Fig 5: Checking Power Steering Solenoid Valve

   Courtesy of NISSAN MOTOR CO., U.S.A.

   OK or NG 

   OK: Perform steering wheel turning force inspection. Refer to "ON-VEHICLE INSPECTION AND SERVICE ".

   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.