VARIABLE GEAR RATIO STEERING SYSTEM, Diagnostic DTC:C15A3/63, C15C5/69

DTC Code DTC Name
C15A3/63 Motor Rotation Angle Not Detected
C15C5/69 Motor Rotation Signal Not Detected

DESCRIPTION

The steering actuator assembly drives the internal motor using the current output from the VGRS ECU (front steering control ECU) to change the relative angle between the tire angle and steering wheel angle.

The rotation angle sensor in the steering actuator assembly detects the motor rotation angle and outputs this information to the VGRS ECU (front steering control ECU).

If the VGRS ECU (front steering control ECU) detects a malfunction in the rotation angle sensor circuit, it stores DTC C15A3/63.

The test mode DTC C15C5/69 is only stored during test mode.

DTC Code DTC Detection Condition Trouble Area
C15A3/63

All conditions are met for approximately 0.12 seconds or more:


  • 2 seconds or more elapse after turning the engine switch on (IG).

  • 2 seconds or more elapse with the power source voltage at 10 V or higher.

  • A problem with the motor rotation angle sensor is detected.

  • Steering actuator assembly

  • VGRS ECU (front steering control ECU)

  • Harness or connector
C15C5/69 The system enters test mode.

  • Steering actuator assembly

  • VGRS ECU (front steering control ECU)

  • Harness or connector

WIRING DIAGRAM

A01FFOJE01

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.

  • Since DTC C1289 is stored in the skid control ECU (brake actuator assembly), after performing repairs on the VGRS system, clear the DTCs for the vehicle stability control system.

PROCEDURE


  1. CHECK DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to

      • DTC C15A3/63 is output as a current DTC

      • When the engine is started and the steering wheel is operated, DTC C15A3/63 is output as a current DTC.

      		 A
      When the engine is started and a wire harness is jiggled, DTC C15A3/63 is output as a current DTC. B
      DTC C15A3/63 is not output as a current DTC C

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  2. CHECK FREEZE FRAME DATA (MOTOR RESOLVER SIN PHASE OFFSET, MOTOR RESOLVER COS PHASE OFFSET)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Display the DTCs on the GTS screen Click here.

    6. Select DTC "C15A3/63", and check the freeze frame data for "Motor Resolver SIN Phase Offset" and "Motor Resolver COS Phase Offset" Click here.

      Result
      Result Proceed to
      "Motor Resolver SIN Phase Offset" and "Motor Resolver COS Phase Offset" are 5 V or higher A
      "Motor Resolver SIN Phase Offset" and "Motor Resolver COS Phase Offset" are below 5 V B

    B

    REPLACE FRONT STEERING CONTROL ECU Click here

    A

  3. INSPECT STEERING ACTUATOR ASSEMBLY


    1. Turn the engine switch off.

    2. A01FDZDE02
      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
      N103-9 (RV) - N103-8 (RG) Always 20 to 60 Ω
      N103-3 (S1) - N103-8 (RG) Always 70 to 160 Ω
      N103-5 (S2) - N103-8 (RG) Always 60 to 150 Ω
      N103-9 (RV) - N103-3 (S1) Always 90 to 220 Ω
      N103-9 (RV) - N103-5 (S2) Always 80 to 210 Ω
      N103-3 (S1) - N103-5 (S2) Always 130 to 310 Ω
      N103-3 (S1) - Body ground Always 100 kΩ or higher
      N103-5 (S2) - Body ground Always 100 kΩ or higher
      N103-8 (RG) - Body ground Always 100 kΩ or higher
      N103-9 (RV) - 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
      N103-3 (S1) - N38-2 (S1+) Always Below 1 Ω
      N103-5 (S2) - N38-9 (S2+) Always Below 1 Ω
      N103-8 (RG) - N38-10 (RG+) Always Below 1 Ω
      N103-9 (RV) - N38-1 (RV+) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE STEERING ACTUATOR ASSEMBLY Click here