POWER SUPPLY AND GROUND CIRCUIT

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
   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

   
   

YES>>GO TO 2.

NO>>
Check the following. If any items are damaged, repair or replace damaged parts.

• 10A fuses (#45) open
  
• Harness for short or open between ignition switch and power steering control unit harness connector No. 3 terminal.
  
• Ignition switch. Refer to Removal and Installation.
  

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

   
   

YES>>GO TO 3.

NO>>Repair open circuit or short to power in harness or connectors.

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

YES>>INSPECTION END

NO>>Repair or replace error-detected parts.