Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VIZK
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1511-C1514,C1521,C1524,C1528,C1531-C1555; Torque Sensor Circuit Malfunction; 2016 - 2020 MY Sienna [12/2015 -        ]

DTC

C1511

Torque Sensor Circuit Malfunction

DTC

C1512

Torque Sensor Circuit Malfunction

DTC

C1513

Torque Sensor Circuit Malfunction

DTC

C1514

Torque Sensor Power Supply Abnormal

DTC

C1521

Motor Circuit Malfunction

DTC

C1524

Motor Circuit Malfunction

DTC

C1528

Motor Rotation Angle Sensor Malfunction

DTC

C1531

ECU Malfunction

DTC

C1532

ECU Malfunction

DTC

C1533

ECU Malfunction

DTC

C1534

ECU Malfunction

DTC

C1555

Motor Relay Welding Failure

DESCRIPTION

The torque sensor converts the rotation torque input to the steering wheel into an electrical signal and sends it to the power steering ECU. Based on this signal, the ECU detects steering effort.

The power steering ECU, power steering torque sensor, power steering motor and motor rotation angle sensor are built into the steering column assembly.

DTC No.

DTC Detection Condition

Trouble Area

C1511

Torque sensor (TRQ1) signal error or stop

  • Steering column assembly

C1512

Torque sensor (TRQ2) signal error or stop

C1513

Deviation between torque sensors TRQ1 and TRQ2 exceeds specified value

C1514

Torque sensor power source voltage error

C1521

Short (or open) in motor circuit or abnormal voltage or current in motor circuit

C1524

Short (or open) in motor circuit or abnormal voltage or current in motor circuit

C1528

Motor rotation angle sensor malfunction

C1531

ECU internal malfunction

(CPU malfunction)

C1532

ECU internal malfunction

(Peripheral circuit malfunction)

C1533

ECU internal malfunction

(Substrate temperature sensor malfunction)

C1534

ECU internal malfunction

(EEPROM error)

C1555

Motor relay circuit malfunction

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When the steering column assembly is replaced, perform the assist map writing (See page 2016 - 2020 MY Sienna [12/2015 -        ]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: REGISTRATION ).
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK CONNECTOR CONNECTION CONDITION (STEERING COLUMN ASSEMBLY)

(a) Check the installation condition of the torque sensor, power steering motor and rotation sensor connectors.

OK:

Torque sensor, power steering motor and rotation angle sensor connectors are securely connected to the power steering ECU.

OK

REPLACE STEERING COLUMN ASSEMBLY

NG

CONNECT CONNECTOR