Dtc C1524 Motor Circuit Malfunction

Steering. Yaris. Ncp93, 131
Power Assist Systems. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT POWER STEERING ECU ASSEMBLY

INSPECT POWER STEERING MOTOR ASSEMBLY

CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BODY GROUND)

DTC C1524 Motor Circuit Malfunction

DTC C1555 Motor Relay Welding Failure


DESCRIPTION

The power steering ECU assembly supplies the current to the power steering motor through the motor circuit.

DTC No.
DTC Detection Condition
Trouble Area
C1524
Short (or open) in motor circuit or abnormal voltage or current in motor circuit.
  1. Power steering motor assembly
  2. Power steering ECU assembly
C1555
Motor relay circuit malfunction.
  1. Power steering motor assembly
  2. Power steering ECU assembly

WIRING DIAGRAM


Yaris. Ncp93, 131.Power Assist Systems.Power Steering System (For Sedan). Dtc C1524 Motor Circuit Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. If the power steering ECU assembly or power steering motor assembly has been replaced, perform the torque sensor zero point calibration and assist map writing (YARIS_NCP93 RM000000OSZ018X.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.INSPECT POWER STEERING ECU ASSEMBLY
Yaris. Ncp93, 131.Power Assist Systems.Power Steering System (For Sedan). Dtc C1524 Motor Circuit Malfunction

  1. Start the engine.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    b10-1 (M1) - A68-2 (PGND)
    		Engine running
    Steering wheel turned to right
    		11 to 14 V
    Engine running
    steering wheel turned to left
    		6 to 11 V
    b10-2 (M2) - A68-2 (PGND)
    		Engine running
    Steering wheel turned to right
    		6 to 11 V
    Engine running
    steering wheel turned to left
    		11 to 14 V
    Text in Illustration
    *a
    		Component with harness connected
    (Power Steering ECU Assembly)


NG
Go to step 3
OK


2.INSPECT POWER STEERING MOTOR ASSEMBLY
Yaris. Ncp93, 131.Power Assist Systems.Power Steering System (For Sedan). Dtc C1524 Motor Circuit Malfunction

  1. Disconnect the power steering ECU assembly connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    b10-1 (M1) - b10-2 (M2)
    		Always
    		0.1 to 1.0 Ω
    b10-1 (M1) - Body ground
    		Always
    		1 MΩ or higher
    b10-2 (M2) - Body ground
    		Always
    		1 MΩ or higher
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to Power Steering ECU Assembly)


NG
REPLACE POWER STEERING MOTOR ASSEMBLY (YARIS_NCP93 RM000000UD004ZX.html)
OK


3.CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BODY GROUND)
Yaris. Ncp93, 131.Power Assist Systems.Power Steering System (For Sedan). Dtc C1524 Motor Circuit Malfunction

  1. Disconnect the power steering ECU assembly connector.

  1. Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
A68-1 (PIG) - Body ground
Ignition switch ON
11 to 14 V

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A68-2 (PGND) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to Power Steering ECU Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER STEERING ECU ASSEMBLY (YARIS_NCP93 RM000002XN603ZX.html)