Diagnosis Procedure

Regarding Wiring Diagram information, refer to WIRING DIAGRAM .

1. CHECK POWER STEERING CONTROL MODULE GROUND CIRCUIT
   
   
   1. Turn ignition switch OFF.
   2. Disconnect power steering control module harness connector.
   3. Check continuity between power steering control module harness connector terminal and ground.

      Power steering control module		-	Continuity
      Connector	Terminal
      E63	2	Ground	Yes

   Is the inspection result normal?

   YES 

   GO TO STEP 2  .

   NO 

   Repair open circuit or short to ground or short to power in harness or connectors, and repair or replace the malfunctioning component.

2. CHECK POWER STEERING CONTROL MODULE POWER SUPPLY CIRCUIT (1)
   
   
   1. Check voltage between power steering control module harness connector terminals and ground.

      Power steering control module		-	Voltage (Approx.)
      Connector	Terminal
      E63	1	Ground	Battery voltage

   Is the inspection result normal?

   YES 

   GO TO STEP 4  .

   NO 

   GO TO STEP 3  .

3. CHECK POWER STEERING CONTROL MODULE POWER SUPPLY CIRCUIT (2)
   
   
   1. Check the 100A fusible link (#D).
   2. Disconnect battery terminal with fusible link harness connector.
   3. Check continuity between power steering control module harness connector terminal and battery terminal with fusible link harness connector terminal.

      Power steering control module		Battery terminal with fusible link		Continuity
      Connector	Terminal	Connector	Terminal
      E63	1	E7	3	Yes

   4. Check continuity between power steering control module harness connector terminal and ground.

      Power steering control module		-	Continuity
      Connector	Terminal
      E63	1	Ground	No

   Is the inspection result normal?

   YES 

   Perform the trouble diagnosis for battery power supply circuit. Refer to WIRING DIAGRAM - BATTERY POWER SUPPLY - .

   NO 

   Repair or replace the malfunctioning component.

4. CHECK POWER STEERING CONTROL MODULE POWER SUPPLY CIRCUIT (3)
   
   
   1. Check voltage between power steering control module harness connector terminals and ground.

      Power steering control module		-	Voltage (Approx.)
      Connector	Terminal
      E62	5	Ground	0 V

   2. Turn ignition switch ON.
      CAUTION:

      Never start the engine.

   3. Check voltage between power steering control module harness connector terminals and ground.

      Power steering control module		-	Voltage (Approx.)
      Connector	Terminal
      E62	5	Ground	Battery voltage

   Is the inspection result normal?

   YES 

   GO TO STEP 6  .

   NO 

   GO TO STEP 5  .

5. CHECK POWER STEERING CONTROL MODULE POWER SUPPLY CIRCUIT (4)
   
   
   1. Turn ignition switch OFF.
   2. Check the 10A fuse No. 49 in the IPDM E/R.
   3. Disconnect IPDM E/R harness connector E119.
   4. Check continuity between power steering control module harness connector terminal and IPDM E/R harness connector terminal.

      Power steering control module		IPDM E/R		Continuity
      Connector	Terminal	Connector	Terminal
      E62	5	E119	35	Yes

   5. Check continuity between power steering control module harness connector terminal and ground.

      Power steering control module		-	Continuity
      Connector	Terminal
      E62	5	Ground	No

   Is the inspection result normal?

   YES 

   Perform the trouble diagnosis for ignition power supply circuit. Refer to WIRING DIAGRAM - IGNITION POWER SUPPLY - .

   NO 

   Repair or replace the malfunctioning component.

6. CHECK TERMINALS AND HARNESS CONNECTORS
   
   

   Check the power steering control module pin terminals for damage or loose connection with harness connector.

   Is the inspection result normal?

   YES 

   Power steering control module is malfunctioning. Replace power steering oil pump assembly. Refer to REMOVAL AND INSTALLATION .

   NO 

   Repair or replace the malfunctioning component.