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

Toyota CH-R Service Manual / Power Assist Systems / Power Steering System / 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.
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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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F68-2 (PGND) - Body ground	Always	Below 1 Ω

REPLACE POWER STEERING ECU ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Assist Map Number Un-Writing (C1581)

DESCRIPTION This DTC will be stored if the power steering ECU assembly determines that the assist map is not written in the ECU. DTC No. Detection Item DTC Detecti ...

Error in Matching of ECUs (C1567)

DESCRIPTION Based on the steering sensor signal, the power steering ECU assembly determines if the correct type of steering sensor is installed. DTC No. Detection Item ...

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