Power Supply and Ground Circuit

POWER SUPPLY AND GROUND CIRCUIT


Description

Power supply to EPS system




POWER SUPPLY AND GROUND CIRCUIT


Diagnosis Procedure

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.





4. Turn the ignition switch ON.

CAUTION:
Never start the engine.
5. Check the voltage between power steering control unit harness connector and ground.





Is the inspection result normal?
YES - GO TO 2.
NO - Check the following. If any items are damaged, repair or replace damaged parts.
- 10A fuse (#45) open
- Harness for short or open between ignition switch and power steering control unit harness connector No. 3 terminal.
- Ignition switch. Component Inspection.
2.CHECK GROUND CIRCUIT
1. Turn the ignition switch OFF.
2. Check the continuity between power steering control unit harness connector and ground.





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.