POWER STEERING SYSTEM > EPS Warning Light Circuit

for Preparation Click here


DESCRIPTION

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

WIRING DIAGRAM


C212086E01


INSPECTION PROCEDURE

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

1.READ VALUE USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Enter the following menus: Chassis / EMPS / Data List.

  1. In accordance with the display on the tester, read the Data List.

    EMPS 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Battery Voltage Lo Record
    		Battery voltage reduction history
    Minimum: 0 times, Maximum: 65535 times
    		0 times
    		-

    OK:
    "Battery Voltage Lo Record" is 0 times.

    Result 
    Result
    		Proceed to
    OK
    		A
    NG (for 1KR-FE engine)
    		B
    NG (for 1NR-FE engine)
    		C
    NG (for 1ND-TV engine)
    		D



B
GO TO CHARGING SYSTEM (Click here)

C
GO TO CHARGING SYSTEM (Click here)

D
GO TO CHARGING SYSTEM (Click here)
A


2.CHECK CAN COMMUNICATION SYSTEM

  1. Using the intelligent tester, check for DTCs and confirm that there are no problems in the CAN communication system (Click here).

    OK:
    DTCs are not output.



NG
GO TO CAN COMMUNICATION SYSTEM (Click here)
OK


3.CHECK HARNESS AND CONNECTOR (STEERING COLUMN ASSEMBLY - BATTERY AND BODY GROUND)


    C193921E01

  1. Disconnect the connectors from the steering column assembly (power steering ECU).

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D51-5 (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
    A15-2 (PGND) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector:
    (to Steering Column Assembly (Power Steering ECU))



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.REPLACE STEERING COLUMN ASSEMBLY

  1. Replace the steering column assembly (Click here).


NEXT


5.PERFORM ASSIST MAP WRITING

  1. Perform assist map writing (Click here).


NEXT


6.CHECK EPS WARNING LIGHT (COMBINATION METER)

  1. Check that the EPS warning light operation for engine start.

    OK:
    The EPS warning light operates normally.



NG
REPLACE COMBINATION METER (Click here)
OK

END