Power Steering Warning Light Circuit

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

DESCRIPTION

The power steering ECU is connected to the combination meter via CAN communication. If the power steering ECU detects a malfunction, the power steering warning light comes on. At this time, the vehicle enters fail-safe mode.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. INSPECT CAN COMMUNICATION SYSTEM

(a) Check for DTCs of the CAN communication system Diagnosis System.

Result

B -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - IG NO. 3 RELAY, BODY GROUND)

(a) Disconnect the power steering ECU connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Text in Illustration

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

3. PERFORM ACTIVE TEST USING TECHSTREAM (INDICAT. EPS)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on

(d) Enter the following menus: Body Electrical / Combination Meter / Active Test / Indicat. EPS.

(e) Perform the Active Test of the combination meter using the Techstream.

Combination Meter

(f) 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 -- INSPECT METER/GAUGE SYSTEM How To Proceed With Troubleshooting

OK -- REPLACE POWER STEERING ECU ASSEMBLY Removal