POWER STEERING SYSTEM (for 1UR-FE) > Power Steering Warning Light Circuit

for Preparation Click here


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


C216948E06


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.INSPECT CAN COMMUNICATION SYSTEM

  1. Check for DTCs of the CAN communication system (Click here).

    Result 
    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output
    		B


B
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (Click here)
A


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


    C214365E05

  1. Disconnect the power steering ECU connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    J119-5 (IG) - Body ground
    		Ignition switch ON
    		11 to 14 V

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    J119-3 (GND) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Power Steering ECU)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON and turn the Techstream on.

  1. Perform the Active Test of the combination meter using the Techstream (Click here).

    Combination Meter 
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Indicat. EPS
    		Power steering warning light
    		ON or OFF
    		Perform the test with the vehicle stopped and the engine idling.

  1. 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 Techstream operation.


NG
GO TO METER/GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (Click here)
OK

REPLACE POWER STEERING ECU ASSEMBLY (Click here)