Toyota CH-R Service Manual: IG Power Supply Voltage (C1551)

DESCRIPTION

The power steering ECU assembly distinguishes the ignition switch status as ON or off through the IG power source circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Return-to-normal Condition

Note

C1551

IG Power Supply Voltage

Open or short in IG power source circuit with power switch on (IG)

  • EPS-IG1 fuse
  • IG power source circuit
  • Power steering ECU assembly

EPS warning light: Comes on

The ECU judges the system has returned to normal or the ignition switch is turned ON again

-

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 (BATTERY - POWER STEERING ECU ASSEMBLY)

(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

(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

OK

REPLACE POWER STEERING ECU ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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