POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for Gasoline Model): C1511-C1514,C1517,C1521-C1523,C1528,C1531-C1555; Torque Sensor1; 2019 - 2022 MY Avalon [04/2018

Last Modified: 08-21-2023	6.11:8.1.0	Doc ID: RM100000001B1VV
Model Year Start: 2019	Model: Avalon	Prod Date Range: [04/2018 - ]
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for Gasoline Model): C1511-C1514,C1517,C1521-C1523,C1528,C1531-C1555; Torque Sensor1; 2019 - 2022 MY Avalon [04/2018 - ]

DTC

C1511

Torque Sensor1

DTC

C1512

Torque Sensor2

DTC

C1513

Torque Sensor Deviation Excessive

DTC

C1514

Torque Sensor Power Supply Voltage

DTC

C1517

Torque Hold

DTC

C1521

Short in Motor Circuit

DTC

C1522

Power Supply Sensor

DTC

C1523

Current Deviation Excessive

DTC

C1528

Motor Rotation Angle Sensor

DTC

C1531

ECU Malfunction

DTC

C1532

ECU Malfunction

DTC

C1533

Temperature Sensor Circuit is Low or High

DTC

C1534

EEPROM

DTC

C1555

Motor Relay Welding Failure

DESCRIPTION

While torque sensor system, motor system or ECU system malfunctions are detected, the fail-safe function suspends power assist. However, power assist continues with limited assistance amount if only C1533 or C1534 is output.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Return-to-normal Condition	Note
C1511	Torque Sensor1	Torque sensor malfunction	Rack and pinion power steering gear assembly	EPS warning light: Comes on	Engine switch on (IG) again	-
C1512	Torque Sensor2	Torque sensor malfunction	Rack and pinion power steering gear assembly	EPS warning light: Comes on	Engine switch on (IG) again	-
C1513	Torque Sensor Deviation Excessive	Torque sensor malfunction	Rack and pinion power steering gear assembly	EPS warning light: Comes on	Engine switch on (IG) again	-
C1514	Torque Sensor Power Supply Voltage	Torque sensor malfunction	Rack and pinion power steering gear assembly	EPS warning light: Comes on	Engine switch on (IG) again	-
C1517	Torque Hold	Torque sensor malfunction	Rack and pinion power steering gear assembly	EPS warning light: Comes on	Engine switch on (IG) again	-
C1521	Short in Motor Circuit	Motor overcurrent	Rack and pinion power steering gear assembly	EPS warning light: Comes on	Engine switch on (IG) again	-
C1522	Power Supply Sensor	Motor current sensor malfunction	Rack and pinion power steering gear assembly	EPS warning light: Comes on	Engine switch on (IG) again	-
C1523	Current Deviation Excessive	Excessively large current deviation	Rack and pinion power steering gear assembly	EPS warning light: Comes on	Engine switch on (IG) again	-
C1528	Motor Rotation Angle Sensor	Motor rotation angle sensor malfunction	Rack and pinion power steering gear assembly	EPS warning light: Comes on	Engine switch on (IG) again	-
C1531	ECU Malfunction	ECU internal malfunction (CPU malfunction)	Rack and pinion power steering gear assembly	EPS warning light: Comes on	Engine switch on (IG) again	-
C1532	ECU Malfunction	ECU internal malfunction (Peripheral circuit malfunction)	Rack and pinion power steering gear assembly	EPS warning light: Comes on	Engine switch on (IG) again	-
C1533	Temperature Sensor Circuit is Low or High	ECU internal malfunction (Substrate temperature sensor malfunction)	Rack and pinion power steering gear assembly	EPS warning light: Comes on	The ECU judges the system has returned to normal	-
C1534	EEPROM	ECU internal malfunction (EEPROM error)	Rack and pinion power steering gear assembly	EPS warning light: Comes on	Engine switch on (IG) again	-
C1555	Motor Relay Welding Failure	Motor relay circuit malfunction	Rack and pinion power steering gear assembly	EPS warning light: Comes on	Engine switch on (IG) again	-

CAUTION / NOTICE / HINT

NOTICE:

If the rack and pinion power steering gear 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.

Chassis > EMPS > Clear DTCs

(b) Check for DTCs.

Chassis > EMPS > Trouble Codes

Result	Proceed to
DTCs other than C1511, C1512, C1513, C1514, C1517, C1521, C1522, C1523, C1528, C1531, C1532, C1533, C1534 or C1555 are not output.	A
DTCs other than C1511, C1512, C1513, C1514, C1517, C1521, C1522, C1523, C1528, C1531, C1532, C1533, C1534 or C1555 are output.	B
DTCs are not output.	C

REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY

GO TO DIAGNOSTIC TROUBLE CODE CHART

USE SIMULATION METHOD TO CHECK