POWER STEERING SYSTEM(for 2GR-FXE), Diagnostic DTC:C1552/22, C1554/23

DTC Code DTC Name
C1552/22 PIG Power Supply Voltage Malfunction
C1554/23 Power Supply Relay Failure

DESCRIPTION

This circuit supplies power to drive the power steering motor.

DTC Code DTC Detection Condition Trouble Area
C1552/22 A PIG power supply voltage malfunction.

  • EPS fuse

  • EPS-B fuse

  • EPS relay (electric power steering relay)

  • Harness or connector

  • Power steering ECU assembly
C1554/23 A power supply relay malfunction.

WIRING DIAGRAM

A000OVCE07
*a from Auxiliary Battery
*b Power Steering ECU Assembly

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • If the power steering ECU assembly is replaced with a new one, perform assist map writing, clear the motor rotation angle sensor calibration value, initialize the motor rotation angle sensor value and calibrate the torque sensor zero point Click here.

PROCEDURE


  1. CHECK CONNECTORS


    1. Check the connection of the power steering ECU assembly connector.

    2. Visually inspect the terminals of the power steering ECU assembly connector.

      Result
      Result Proceed to
      Normal A
      Connectors not properly connected B
      Power steering ECU assembly connector terminals abnormal C

    B

    CONNECT CONNECTORS CORRECTLY

    C

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    A

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


    1. Disconnect the power steering ECU assembly connector.

    2. A000PBZE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A29-10 (PIG) - Body ground Always Below 1 V

    NG

    CHECK EPS RELAY (ELECTRIC POWER STEERING RELAY) Click here

    OK

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


    1. Disconnect the power steering ECU assembly connector.

    2. A000QCQE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A29-10 (PIG) - Body ground Terminals A29-12 (RLY) and A29-9 (PGND) connected 11 to 14 V

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    NG

  4. CHECK EPS RELAY (ELECTRIC POWER STEERING RELAY)


    1. A000NTBE03
      Text in Illustration
      *1 EPS Relay (Electric Power Steering Relay)

      Remove the EPS relay (electric power steering relay) from the No. 1 engine room relay block and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 180 to 220 Ω
      3 - 5 Auxiliary battery voltage not applied to terminals 1 and 2 10 kΩ or higher
      Auxiliary battery voltage applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE EPS RELAY (ELECTRIC POWER STEERING RELAY)

    OK

  5. CHECK TERMINAL VOLTAGE (EPS RELAY [ELECTRIC POWER STEERING RELAY])


    1. A000OLME02
      Text in Illustration
      *a

      Component without EPS Relay (Electric Power Steering Relay)

      (No. 1 Engine Room Relay Block and Junction Block Assembly)
      *b

      Component without EPS Relay (Electric Power Steering Relay)

      EPS Relay (Electric Power Steering Relay) Connection Area

      Remove the EPS relay (electric power steering relay) from the No. 1 engine room relay block and junction block assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      1 - Body ground Always 11 to 14 V
      5 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (NO. 1 ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY - POWER STEERING ECU ASSEMBLY)


    1. Remove the EPS relay (electric power steering relay) from the No. 1 engine room relay block and junction block assembly.

    2. Disconnect the A29 power steering ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A29-12 (RLY) - 2 Always Below 1 Ω
      A29-10 (PIG) - 3 Always Below 1 Ω
      A29-12 (RLY) - A29-10 (PIG) Always 10 kΩ or higher
      A29-10 (PIG) or 3 - Body ground Always 10 kΩ or higher
      A29-12 (RLY) or 2 - Body ground Always 10 kΩ or higher

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR