From 08/2009

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: PS Warning Light Remains ON
- PS Warning Light Remains ON

DESCRIPTION

If the power steering ECU detects a malfunction, the P/S 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 the rotation angle sensor initialization and torque sensor zero point calibration Programming and Relearning.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR

(a) Turn the engine switch on (IG).

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

OK:

P/S 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
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (IG POWER SUPPLY)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / EMPS / Data List.

(f) Select the item "IG Power Supply" in the Data List and read the value displayed on the Techstream.

EMPS

OK:

The normal condition value is displayed on the Techstream.

NG -- CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - BODY GROUND)

OK -- REPLACE POWER STEERING ECU Removal

4. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - BODY GROUND)

(a) Disconnect the connectors from the power steering ECU.

(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.

5. PERFORM ACTIVE TEST USING TECHSTREAM (COMBINATION METER)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Combination Meter / Active Test.

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

Combination Meter

(g) Check that the EPS 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.

NG -- REPLACE COMBINATION METER ASSEMBLY Removal

OK -- REPLACE POWER STEERING ECU Removal