Dtc C1524 Motor Circuit Malfunction

Steering. Corolla. Zre142 Aze141
Power Assist Systems. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK POWER STEERING ECU

CHECK STEERING COLUMN ASSEMBLY (POWER STEERING MOTOR)

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

DTC C1524 Motor Circuit Malfunction

DTC C1555 Motor Relay Welding Failure


DESCRIPTION

The power steering ECU supplies 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 in motor circuit.
  1. Steering column assembly (power steering motor)
  2. Power steering ECU
C1555
Predriver (Motor relay circuit) malfunction

WIRING DIAGRAM


Corolla. Zre142 Aze141.Power Assist Systems.Power Steering System (For 2Az-Fe). Dtc C1524 Motor Circuit Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. If the power steering ECU has been replaced with a new one, perform the assist map writing and the torque sensor zero point calibration (COROLLA_ZRE142 RM00000275305DX.html).
  2. If the steering column assembly has been replaced with a new one, perform the torque sensor zero point calibration after performing the initialization of the torque sensor zero point value (COROLLA_ZRE142 RM00000275305DX.html).
1.CHECK POWER STEERING ECU
Corolla. Zre142 Aze141.Power Assist Systems.Power Steering System (For 2Az-Fe). Dtc C1524 Motor Circuit Malfunction

  1. Turn the ignition switch on (IG).

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

    Standard Voltage:
    Tester Connection
    		Condition
    (Steering Position)
    		Specified Condition
    a2-1 (M1) - A75-2 (PGND)
    		Engine running
    (Turned to right)
    		Below 1 V
    a2-1 (M1) - A75-2 (PGND)
    		Engine running
    (Turned to left)
    		11 to 14 V
    a2-2 (M2) - A75-2 (PGND)
    		Engine running
    (Turned to right)
    		11 to 14 V
    a2-2 (M2) - A75-2 (PGND)
    		Engine running
    (Turned to left)
    		Below 1 V


NG
Go to step 3
OK


2.CHECK STEERING COLUMN ASSEMBLY (POWER STEERING MOTOR)
Corolla. Zre142 Aze141.Power Assist Systems.Power Steering System (For 2Az-Fe). Dtc C1524 Motor Circuit Malfunction

  1. Disconnect the connector from the power steering ECU.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    a2-1 (M1) - a2-2 (M2)
    		Always
    		0.08 to 0.15 Ω
    a2-1 (M1) - Body ground
    		Always
    		1 MΩ or higher
    a2-2 (M2) - Body ground
    		Always
    		1 MΩ or higher


NG
REPLACE STEERING COLUMN ASSEMBLY (COROLLA_ZRE142 RM0000029SZ02TX.html)
OK


3.CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - BODY GROUND)
Corolla. Zre142 Aze141.Power Assist Systems.Power Steering System (For 2Az-Fe). Dtc C1524 Motor Circuit Malfunction

  1. Disconnect the connector from the power steering ECU.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A75-1 (PIG) - Body ground
    		Ignition switch on (IG)
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A75-2 (PGND) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER STEERING ECU (COROLLA_ZRE142 RM000002XN605BX.html)