Toyota CH-R Service Manual: EPS Warning Light Circuit

Toyota CH-R Service Manual / Power Assist Systems / Power Steering System / EPS Warning Light Circuit

DESCRIPTION

If the power steering ECU assembly detects a malfunction, the power steering ECU assembly stores a DTC and illuminates the EPS warning light.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • If the power steering ECU assembly has been replaced, perform assist map writing and torque sensor zero point calibration.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR

(a) Jiggle the power steering ECU assembly connectors and wire harness up and down, and left and right to check the illumination condition of the EPS warning light in the combination meter assembly.

OK:

The EPS warning light illumination condition does not change.

HINT:

When the EPS warning light is operating properly, it comes on when the ignition switch is turned to ON and goes off when the engine is started.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

2.

CHECK CAN COMMUNICATION SYSTEM

(a) Check for DTCs.

Click here

Result

Proceed to

CAN communication system DTCs are not output.

A

CAN communication system DTCs are output.

B
B

GO TO CAN COMMUNICATION SYSTEM

A

3.

CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - GROUND)

(a) Disconnect the F68 and F23 power steering ECU assembly connectors.

*a

Front view of wire harness connector

(to Power Steering ECU Assembly)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

F23-1 (IG) - Body ground

Ignition switch ON

8 to 16 V

F68-1 (PIG) - Body ground

Ignition switch ON

9 to 16 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F68-2 (PGND) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

INSPECT COMBINATION METER ASSEMBLY

(a) Connect the F68 and F23 power steering ECU assembly connectors.

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

Body Electrical > Combination Meter > Active Test

Tester Display

Indicat. EPS

(c) Check the combination meter assembly.

OK:

The EPS warning light turns on or off in accordance with the Techstream operation.

OK

REPLACE POWER STEERING ECU ASSEMBLY

NG

GO TO METER / GAUGE SYSTEM

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    DESCRIPTION This DTC does not indicate a malfunction. The power steering ECU assembly stores this DTC when it determines that torque sensor zero point calibration has not completed. DTC ...

    Lost Communication With ECM/PCM "A" (U0100,U0129,U023A)
    DESCRIPTION The power steering ECU assembly receives signals from the ECM and skid control ECU (brake actuator assembly) via CAN communication. DTC No. Detection Item ...

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