Toyota CH-R Service Manual: Short in Motor Circuit (C1521-C1523,C1528,C1531-C1555)

Toyota CH-R Service Manual / Power Assist Systems / Power Steering System / Short in Motor Circuit (C1521-C1523,C1528,C1531-C1555)

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Return-to-normal Condition	Note
C1521	Short in Motor Circuit	Motor overcurrent	Power steering ECU assembly	EPS warning light: Comes on	Ignition switch ON again	-
C1522	Power Supply Sensor	Motor current sensor malfunction	Power steering ECU assembly	EPS warning light: Comes on	Ignition switch ON again	-
C1523	Current Deviation Excessive	Excessively large current deviation	Power steering ECU assembly	EPS warning light: Comes on	Ignition switch ON again	-
C1528	Motor Rotation Angle Sensor	Motor rotation angle sensor malfunction	Power steering ECU assembly	EPS warning light: Comes on	Ignition switch ON again	-
C1531	ECU Malfunction	ECU internal malfunction (CPU malfunction)	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	-
C1532	ECU Malfunction	ECU internal malfunction (Peripheral circuit malfunction)	Power steering ECU assembly	EPS warning light: Comes on	Ignition switch ON again	-
C1533	Temperature Sensor Circuit is Low or High	ECU internal malfunction (Substrate temperature sensor malfunction)	Power steering ECU assembly	EPS warning light: Comes on	Ignition switch ON again	-
C1534	EEPROM	ECU internal malfunction (EEPROM error)	Power steering ECU assembly	EPS warning light: Comes on	Ignition switch ON again	-
C1555	Motor Relay Welding Failure	Motor relay circuit malfunction	Power steering ECU assembly	EPS Warning Light: Comes on	Ignition switch ON again	-

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

PROCEDURE

1.	CHECK FOR DTC

(a) Clear the DTCs.

Click here

Chassis > EMPS > Clear DTCs

(b) Check for DTCs.

Click here

Chassis > EMPS > Trouble Codes

Result	Proceed to
DTCs other than C1521, C1522, C1523, C1528, C1531, C1532, C1533, C1534 or C1555 are not output.	A
DTCs other than C1521, C1522, C1523, C1528, C1531, C1532, C1533, C1534 or C1555 are output.	B

REPLACE POWER STEERING ECU ASSEMBLY

GO TO DIAGNOSTIC TROUBLE CODE CHART

Vehicle Speed Signal (C1541)

DESCRIPTION The power steering ECU assembly receives vehicle speed signals from the skid control ECU (brake actuator assembly) via CAN communication. The ECU provides appropriate assist force in ...

Torque Sensor Zero Point Adjustment Incomplete (C1516)

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 ...

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Toyota CH-R Service Manual: Short in Motor Circuit (C1521-C1523,C1528,C1531-C1555)

Vehicle Speed Signal (C1541)

Torque Sensor Zero Point Adjustment Incomplete (C1516)

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Toyota C-HR (AX20) 2023-2026 Owner's Manual

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Toyota CH-R Service Manual