Diagnosis Procedure

Regarding Wiring Diagram information, refer to -- appropriate Wiring Diagram

1. CHECK IGNITION POWER SUPPLY FOR STEERING ANGLE MAIN CONTROL MODULE 
   1. Turn the ignition switch OFF.
   2. Disconnect steering angle main control module harness connector.
   3. Check the voltage between steering angle main control module harness connector and ground.

      Steering angle main control module		--	Voltage (Approx.)
      Connector	Terminal
      E149	25	Ground	0 V

   4. Turn the ignition switch ON.
   5. Check the voltage between steering angle control module harness connector and ground.

      Steering angle main control module		--	Voltage (Approx.)
      Connector	Terminal
      E149	25	Ground	Battery voltage

   Is the inspection result normal?

   YES

   GO TO 2.

   NO

   GO TO 3.

2. CHECK INTERMITTENT INCIDENT FOR STEERING ANGLE MAIN CONTROL MODULE 
   1. Turn the ignition switch OFF.
   2. Check enlarged contact spring of terminal. Refer to How to Check Terminal .
   3. Perform intermittent incident while turning steering wheel. Refer to Intermittent Incident .

   Is the inspection result normal?

   YES

   Replace steering angle main control module. Refer to Removal and Installation .

   NO

   Repair or replace malfunctioning component.

3. CHECK IGNITION POWER SUPPLY CIRCUIT (1) 
   1. Turn the ignition switch OFF.
   2. Disconnect steering angle sub control module harness connector.
   3. Check the continuity between steering angle main control module harness connector and steering angle sub control module harness connector.

      Steering angle main control module		Steering angle sub control module		Continuity
      Connector	Terminal	Connector	Terminal
      E149	25	E144	27	Yes

   Is the inspection result normal?

   YES

   GO TO 4.

   NO

   Repair or replace malfunctioning component.

4. CHECK INTERNAL CIRCUIT IN STEERING ANGLE SUB CONTROL MODULE 

   Check the continuity between steering angle sub control module connector terminals.

   Steering angle sub control module		Continuity
   Terminal
   25	27	Yes

   Is the inspection result normal?

   YES

   GO TO 5.

   NO

   Replace steering angle sub control module. Refer to Removal and Installation .

5. CHECK IGNITION POWER SUPPLY FOR STEERING ANGLE SUB CONTROL MODULE 
   1. Check the voltage between steering angle sub control module harness connector and ground.

      Steering angle sub control module		--	Voltage (Approx.)
      Connector	Terminal
      E144	25	Ground	0 V

   2. Turn the ignition switch ON.
   3. Check the voltage between steering angle control module harness connector and ground.

      Steering angle sub control module		--	Voltage (Approx.)
      Connector	Terminal
      E144	25	Ground	Battery voltage

   Is the inspection result normal?

   YES

   GO TO 6.

   NO

   GO TO 7.

6. CHECK INTERMITTENT INCIDENT FOR STEERING ANGLE SUB CONTROL MODULE 
   1. Turn the ignition switch OFF.
   2. Check enlarged contact spring of terminal. Refer to How to Check Terminal .
   3. Perform intermittent incident while turning steering wheel. Refer to Intermittent Incident .

   Is the inspection result normal?

   YES

   Replace steering angle sub control module. Refer to Removal and Installation .

   NO

   Repair or replace malfunctioning component.

7. CHECK IGNITION POWER SUPPLY CIRCUIT (2) 
   1. Turn the ignition switch OFF.
   2. Disconnect steering force control module harness connector.
   3. Check the continuity between steering angle sub control module harness connector and steering force control module harness connector.

      Steering angle sub control module		Steering force control module		Continuity
      Connector	Terminal	Connector	Terminal
      E144	25	E141	27	Yes

   Is the inspection result normal?

   YES

   GO TO 8.

   NO

   Repair or replace malfunctioning component.

8. CHECK INTERNAL CIRCUIT IN STEERING FORCE CONTROL MODULE 

   Check the continuity between steering force control module connector terminals.

   Steering force control module		Continuity
   Terminal
   25	27	Yes

   Is the inspection result normal?

   YES

   GO TO 9.

   NO

   Replace steering force control module. Refer to Removal and Installation .

9. CHECK IGNITION POWER SUPPLY FOR STEERING FORCE CONTROL MODULE 
   1. Check the voltage between steering force control module harness connector and ground.

      Steering force control module		--	Voltage (Approx.)
      Connector	Terminal
      E141	25	Ground	0 V

   2. Turn the ignition switch ON.
   3. Check the voltage between force control module harness connector and ground.

      Steering force control module		--	Voltage (Approx.)
      Connector	Terminal
      E141	25	Ground	Battery voltage

   Is the inspection result normal?

   YES

   GO TO 10.

   NO

   GO TO 11.

10. CHECK INTERMITTENT INCIDENT FOR STEERING FORCE CONTROL MODULE 
    1. Turn the ignition switch OFF.
    2. Check enlarged contact spring of terminal. Refer to How to Check Terminal .
    3. Perform intermittent incident while turning steering wheel. Refer to Intermittent Incident .

    Is the inspection result normal?

    YES

    Replace steering force control module. Refer to Removal and Installation .

    NO

    Repair or replace malfunctioning component.

11. CHECK IGNITION POWER SUPPLY CIRCUIT (3) 
    1. Turn the ignition switch OFF.
    2. Check the 10A fuse (#53).
    3. Check the harness for open or short between steering force control module harness connector No. 25 terminal and the 10A fuse (#53).

    Is the inspection result normal?

    YES

    Perform the trouble diagnosis for ignition power supply circuit. Refer to appropriate Wiring Diagram .

    NO

    Repair or replace malfunctioning component.