ELECTRONIC POWER STEERING SYSTEM, Diagnostic DTC:C1551/51

DTC Code DTC Name
C1551/51 IG Power Source Circuit Malfunction

DESCRIPTION

DTC No. DTC Detecting Condition Trouble Areas
C1551/51 Unusual IG voltage value which not within specified range input to power steering ECU assembly.

  • ECU - IG fuse

  • IG power source circuit

  • Power steering ECU assembly

WIRING DIAGRAM

A0137QTE01
A01377JE02

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON and turn the intelligent tester main switch ON.

    3. Select the item PIG POWER SUPPLY in the DATA LIST and read the value displayed on the intelligent tester.

      Standard Voltage
      10 to 16 V

    OK

    CHECK FOR INTERMITTENT PROBLEMS

    NG

  2. INSPECT FUSE (ECU-IG)

    A01391UE02

    1. Remove the ECU-IG fuse from the instrument panel J/B.

    2. Check the resistance of the ECU-IG fuse.

      Standard Resistance
      Below 1 Ω

    3. Reinstall the ECU-IG fuse.


    NG

    INSPECT FOR SHORT CIRUCUITS IN ALL HANESSES AND COMPONENTS CONNECTED TO ECU - IG FUSE

    OK

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

    A0135ZNE01

    1. Disconnect the C24 connector from the power steering ECU assembly.

    2. Measure the resistance between terminal PGND of C24 connector and body ground.

      Standard Resistance
      1 Ω or less

    3. Reconnect the connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - DRIVER SIDE J/B)

    A01370WE01

    1. Disconnect the C23 and C24 connectors from the power steering ECU assembly.

    2. Turn the ignition switch ON.

    3. Measure the voltage between terminals IG and PGND of the C23 and C24 connectors.

      Standard Voltage
      10 to 16 V

    4. Reconnect the connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER STEERING ECU ASSEMBLY