VARIABLE GEAR RATIO STEERING SYSTEM, Diagnostic DTC:C15A5/65

DTC Code DTC Name
C15A5/65 Lock Mechanism Circuit

DESCRIPTION

If the VGRS ECU (front steering control ECU) detects a malfunction in the lock mechanism, it turns the master warning light on, and stores DTC C15A5/65.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition
C15A5/65 Lock Mechanism Circuit

Both conditions are met for approximately 0.025 seconds or more:


  • The engine switch is on (IG).

  • A short in the motor circuit or an internal malfunction in the ECU is detected.

  • Steering actuator assembly

  • VGRS ECU (front steering control ECU)

  • Harness or connector

 Comes on Engine switch on (IG) again

WIRING DIAGRAM

Refer to DTC C15A3/63.

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CAUTION / NOTICE / HINT

Note

When replacing the VGRS ECU (front steering control ECU) or steering actuator assembly, perform actuator angle neutral point calibration and initialization after replacing parts.

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PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (LV, LG TERMINAL)


    1. B003X5SC20
      *a

      Component with harness connected

      (VGRS ECU [Front Steering Control ECU])

      Turn the engine switch on (IG).

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

      Tech Tips

      With the connector connected to the VGRS ECU (front steering control ECU), measure the voltage from the rear of the connector.

      Standard Voltage
      Tester Connection Condition Specified Condition
      K18-2 (LV) - Body ground Engine switch on (IG) 11 to 14 V
      K18-6 (LG) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT STEERING ACTUATOR ASSEMBLY Click here

    OK

  2. READ VALUE USING GTS (LOCK SOLENOID VOLTAGE)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Start the engine.

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / VGRS / Data List.


      Chassis > VGRS > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Lock Solenoid Voltage Lock solenoid voltage

      Min.: 0.00 V

      Max.: 255.99 V

      		 0 to 14 V -

      Chassis > VGRS > Data List
      Tester Display
      Lock Solenoid Voltage
      OK
      0 to 14 V (while the engine is being started)
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE VGRS ECU (FRONT STEERING CONTROL ECU) - LHD REPLACE VGRS ECU (FRONT STEERING CONTROL ECU) Click here
    REPLACE VGRS ECU (FRONT STEERING CONTROL ECU) - RHD REPLACE VGRS ECU (FRONT STEERING CONTROL ECU) Click here

  3. INSPECT STEERING ACTUATOR ASSEMBLY


    1. B003SXSC10
      *a

      Front view of wire harness connector

      (to VGRS ECU [Front Steering Control ECU])

      Turn the engine switch off.

    2. Disconnect the K18 VGRS ECU (front steering control ECU) connector.

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

      Tech Tips

      Measure the resistance of the steering actuator assembly at the connector of the VGRS ECU (front steering control ECU).

      Standard Resistance
      Tester Connection Condition Specified Condition
      K18-2 (LV) - K18-6 (LG) Always 10 to 30 Ω
      K18-2 (LV) - Body ground Always 100 kΩ or higher
      K18-6 (LG) - Body ground Always 100 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE VGRS ECU (FRONT STEERING CONTROL ECU) - LHD REPLACE VGRS ECU (FRONT STEERING CONTROL ECU) Click here
    REPLACE VGRS ECU (FRONT STEERING CONTROL ECU) - RHD REPLACE VGRS ECU (FRONT STEERING CONTROL ECU) Click here

    NG

  4. CHECK HARNESS AND CONNECTOR (VGRS ECU (FRONT STEERING CONTROL ECU) - STEERING ACTUATOR ASSEMBLY)


    1. Turn the engine switch off.

    2. Disconnect the K18 VGRS ECU (front steering control ECU) connector.

    3. Disconnect the K15 steering actuator assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K18-2 (LV) - K15-7 (LV+) Always Below 1 Ω
      K18-6 (LG) - K15-16 (LG+) Always Below 1 Ω
      K18-2 (LV) - K18-6 (LG) Always 10 to 30 Ω
      K18-2 (LV) or K15-7 (LV+) - Body ground Always 100 kΩ or higher
      K18-6 (LG) or K15-16 (LG+) - Body ground Always 100 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STEERING ACTUATOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR