Diagnosis Procedure

Power supply to EPS system

1. CHECK POWER SUPPLY 
   1. Turn the ignition switch OFF.
   2. Disconnect power steering control unit harness connector.
   3. Check the voltage between power steering control unit harness connector and ground.

      Power steering control unit		--	Voltage (Approx.)
      Connector	Terminal
      M108	3	Ground	0 V

   4. Turn the ignition switch ON.
      CAUTION: Never start the engine.
   5. Check the voltage between power steering control unit harness connector and ground.

      Power steering control unit		--	Voltage
      Connector	Terminal
      M108	3	Ground	Battery voltage

   Is the inspection result normal?

   YES

   GO TO 2.

   NO

   Check the following. If any items are damaged, repair or replace damaged parts.

   • 10 A fuse (No. 45) open
     • Harness for short or open between ignition switch and power steering control unit harness connector No. 3 terminal.
     • Ignition switch. Refer to PUSH-BUTTON IGNITION SWITCH : Exploded View .
2. CHECK GROUND CIRCUIT 
   1. Turn the ignition switch OFF.
   2. Check the continuity between power steering control unit harness connector and ground.

      Power steering control unit		--	Continuity
      Connector	Terminal
      M108	6	Ground	Existed

   Is the inspection result normal?

   YES

   GO TO 3.

   NO

   Repair or replace error-detected parts.

3. CHECK TERMINALS AND HARNESS CONNECTORS 

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

   Is the inspection result normal?

   YES

   INSPECTION END

   NO

   Repair or replace error-detected parts.