DTC    C1522    Motor Circuit Malfunction

DTC    C1523    Motor Circuit Malfunction

DTC    C1524    Motor Circuit Malfunction

DTC    C1555    Motor Relay Welding Failure

for Preparation Click here


DESCRIPTION

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

DTC No.
DTC Detection Condition
Trouble Area
C1522
Motor current sensor malfunction
  1. Steering column assembly
  2. Power steering ECU assembly
C1523
Excessively large current deviation
C1524
Short (or open) in motor circuit or abnormal voltage or current in motor circuit
C1555
Motor relay circuit malfunction

WIRING DIAGRAM


C140416E19


INSPECTION PROCEDURE

NOTICE:
If the steering column assembly or power steering ECU assembly has been replaced, perform rotation angle sensor initialization and torque sensor zero point calibration (Click here).

1.READ VALUE USING INTELLIGENT TESTER (MOTOR VOLTAGE)

  1. Turn the power switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (READY).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Chassis / EMPS / Data List.

  1. Select the items "Motor Terminal Volt (U)", "Motor Terminal Volt (V)" and "Motor Terminal Volt (W)" in the Data List and read the value displayed on the intelligent tester.

    EMPS 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Motor Terminal Volt (U)
    		Motor terminal voltage (U phase)/
    Min.: 0 V
    Max.: 98 V
    		Value changes within 4 to 35 V range
    		Power switch on (READY) and steering wheel being turned
    Motor Terminal Volt (V)
    		Motor terminal voltage (V phase)/
    Min.: 0 V
    Max.: 98 V
    		Value changes within 4 to 35 V range
    		Power switch on (READY) and steering wheel being turned
    Motor Terminal Volt (W)
    		Motor terminal voltage (W phase)/
    Min.: 0 V
    Max.: 98 V
    		Value changes within 4 to 35 V range
    		Power switch on (READY) and steering wheel being turned


Result 
Condition
Proceed to
During steering operation, value changes within 4 to 35 V range
A
During steering operation, voltage is not generated
B


B
REPLACE STEERING COLUMN ASSEMBLY (Click here)
A

REPLACE POWER STEERING ECU ASSEMBLY (Click here)