POWER STEERING SYSTEM, 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

A01FDTRE02

INSPECTION PROCEDURE

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 connector.

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

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

    B

    CONNECT CONNECTORS CORRECTLY

    C

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    A

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


    1. Disconnect the power steering ECU connector.

    2. A01FGZ2E03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU)

      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 (BATTERY - POWER STEERING ECU)


    1. Disconnect the power steering ECU connector.

    2. A01FGZ2E04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU)

      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

    NG

    CHECK EPS RELAY (ELECTRIC POWER STEERING RELAY) Click here

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

  4. CHECK EPS RELAY (ELECTRIC POWER STEERING RELAY)


    1. A01FFZS

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

    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 Battery voltage not applied to terminals 1 and 2 10 kΩ or higher
      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)


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

      A01FH2ZE01
      Text in Illustration
      *A for LHD *B for RHD
      *a

      Component without EPS relay (electric power steering relay)

      (No. 1 Engine Room Relay Block)

      		 *b

      Component without EPS relay (electric power steering relay)

      (No. 1 Engine Room Relay Block)
      *c

      Component without EPS relay (electric power steering relay)

      EPS Relay (Electric Power Steering Relay) Connection Area

      		 *d

      Component without EPS relay (electric power steering relay)

      EPS Relay (Electric Power Steering Relay) Connection Area

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

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      2 - Body ground Always 11 to 14 V
      5 - Body ground Always 11 to 14 V
      for RHD
      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 - POWER STEERING ECU)


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

    2. Disconnect the A29 power steering ECU connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A29-12 (RLY) - 1 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) - Body ground Always 10 kΩ or higher
      A29-12 (RLY) - Body ground Always 10 kΩ or higher
      for RHD
      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) - Body ground Always 10 kΩ or higher
      A29-12 (RLY) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here