POWER STEERING SYSTEM > EPS Warning Light Circuit

for Preparation Click here


DESCRIPTION

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

WIRING DIAGRAM


C210565E10


INSPECTION PROCEDURE

NOTICE:
If the steering column assembly or power steering ECU assembly has been replaced, perform rotation angle sensor value initialization and torque sensor zero point calibration (Click here).

1.CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

  1. Check for DTCs (Click here).

    OK:
    DTC is not output.



NG
GO TO CAN COMMUNICATION SYSTEM (Click here)
OK


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


    C113533E32

  1. Disconnect the connectors from the power steering ECU assembly.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H25-6 (IG) - A26-2 (PGND)
    		Power switch on (IG)
    		9 to 16 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A26-2 (PGND) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Power Steering ECU Assembly)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.PERFORM ACTIVE TEST USING INTELLIGENT TESTER

  1. Turn the power switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / Combination Meter / Active Test.

  1. Perform the Active Test of the combination meter assembly using the intelligent tester.


Combination Meter 
Tester Display
Test Part
Control Range
Diagnostic Note
Indicat. EPS
P/S warning light
OFF or ON
Confirm that the vehicle is stopped with the engine idling

  1. Check that the P/S warning light operates in accordance with the Active Test.

    HINT:
    Reconnect the connectors and restore the vehicle to the condition it was in before checking the combination meter.



NG
REPLACE COMBINATION METER ASSEMBLY (Click here)
OK

REPLACE POWER STEERING ECU ASSEMBLY (Click here)