Power Steering Warning Light Circuit

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: Power Steering Warning Light Circuit
- Power Steering Warning Light Circuit

DESCRIPTION

If the power steering ECU detects a malfunction, the power steering warning light comes on. At this time, the power steering ECU stores a DTC in its memory.

WIRING DIAGRAM









INSPECTION PROCEDURE

NOTICE:
If the power steering ECU has been replaced with a new one, perform rotation angle sensor initialization and torque sensor zero point calibration Programming and Relearning.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR

(a) Turn the ignition switch to ON.

(b) Check the indication condition of the power steering warning light by wiggling the power steering ECU connector and wire harness up and down, and right and left.

OK:

Power steering warning light indication condition does not change.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

2. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

(a) Check for DTCs Diagnosis System.

OK:

DTC is not output.

NG -- GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) How to Proceed With Troubleshooting
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (IG POWER SUPPLY) C1551

NG -- CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - BATTERY AND BODY GROUND)
OK -- Continue to next step.

4. READ VALUE USING TECHSTREAM (PIG POWER SUPPLY) C1552

NG -- CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - BATTERY AND BODY
GROUND)
OK -- Continue to next step.

5. PERFORM ACTIVE TEST USING TECHSTREAM (METER / GAUGE SYSTEM)

(a) Perform the Active Test of the combination meter using the Techstream Meter / Gauge System.

Combination Meter





(b) Check that the power steering warning light operates in accordance with the Active Test.

HINT
Reconnect the connectors and restore the vehicle to its previous condition before checking the combination meter.

OK:

The power steering warning light turns on and off in accordance with the Techstream operation.

NG -- GO TO METER / GAUGE SYSTEM (HOW TO
PROCEED WITH TROUBLESHOOTING) How To Proceed With Troubleshooting

OK -- REPLACE POWER STEERING ECU ASSEMBLY Removal

6. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - BATTERY AND BODY GROUND) C1551

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POWER STEERING ECU ASSEMBLY Removal

7. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - BATTERY AND BODY
GROUND) C1552

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POWER STEERING ECU ASSEMBLY Removal