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, stores DTC C15A5/65 and stops VGRS operation.

DTC Code DTC Detection Condition Trouble Area
C15A5/65

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

WIRING DIAGRAM

Refer to DTC C15A3/63 Click here.

INSPECTION PROCEDURE

Note


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

  • Since DTC C1B09/19 is stored in the DRS ECU (rear steering control ECU), after performing repairs on the VGRS system, clear the DTCs for the dynamic rear steering system.

PROCEDURE


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


    1. A01FF97E03
      Text in Illustration
      *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 Switch Condition Specified Condition
      N103-2 (LV) - Body ground Engine switch on (IG) 11 to 14 V
      N103-6 (LG) - Body ground Engine switch on (IG) 11 to 14 V

    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.

      VGRS
      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 -
      OK
      0 to 14 V (while the engine is being started)

    NG

    REPLACE FRONT STEERING CONTROL ECU Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  3. INSPECT STEERING ACTUATOR ASSEMBLY


    1. Turn the engine switch off.

    2. A01FDZDE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to VGRS ECU [Front Steering Control ECU])

      Disconnect the 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
      N103-2 (LV) - N103-6 (LG) Always 10 to 30 Ω
      N103-2 (LV) - Body ground Always 100 kΩ or higher
      N103-6 (LG) - Body ground Always 100 kΩ or higher

    NG

    CHECK HARNESS AND CONNECTOR (FRONT STEERING CONTROL ECU - STEERING ACTUATOR ASSEMBLY) Click here

    OK

    REPLACE FRONT STEERING CONTROL ECU Click here

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


    1. Turn the engine switch off.

    2. Disconnect the N103 VGRS ECU (front steering control ECU) connector.

    3. Disconnect the N38 steering actuator assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N103-2 (LV) - N38-7 (LV+) Always Below 1 Ω
      N103-6 (LG) - N38-16 (LG+) Always Below 1 Ω
      N103-2 (LV) - Body ground Always 100 kΩ or higher
      N103-6 (LG) - Body ground Always 100 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE STEERING ACTUATOR ASSEMBLY Click here