POWER STEERING SYSTEM, Diagnostic DTC:C1551

DTC Code DTC Name
C1551 IG Power Supply Voltage Malfunction

DESCRIPTION

If the power steering ECU assembly determines that there is a malfunction in the IG power source circuit, it outputs this DTC. This DTC is not output when there is an open circuit in the wire harness connected to terminal IG or a battery voltage drop.

DTC No. DTC Detection Condition Trouble Area
C1551 IG power source circuit malfunction Power steering ECU assembly

WIRING DIAGRAM

A01602JE07

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT FUSE (ECU-IG LH)


    1. Remove the ECU-IG LH fuse from the cowl side junction block LH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ECU-IG LH fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BATTERY)


    1. A0163IPE40

      Disconnect the A31 connector from the power steering ECU assembly.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A31-9 (IG) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A0163IPE41

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A31-5 (PGND) - Body ground Always Below 1 Ω

      Note

      Replace the power steering ECU assembly, initialize the rotation angle sensor value and calibrate the torque sensor zero point Click here.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here