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


C243322E02


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 (Click here).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.INSPECT POWER STEERING ECU ASSEMBLY
C233844E07
  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
C233846E02
  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 (Click here)
OK


3.CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BODY GROUND)
C233847E02
  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 (Click here)