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VARIABLE GEAR RATIO STEERING SYSTEM, Diagnostic DTC:C15A3, C15C5

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DTC Code DTC Name
C15A3 Motor Rotation Angle Not Detected
C15C5 Motor Rotation Signal Not Detected
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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 motor 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 motor rotation angle sensor circuit, it stores DTC C15A3.

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

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition
C15A3 Motor Rotation Angle Not Detected

All conditions are met:


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

  • Power source voltage at 10 V or higher.

  • A problem with the motor rotation angle sensor is detected for approximately 0.03 seconds or more.

  • Steering actuator assembly

  • VGRS ECU (front steering control ECU)

  • Harness or connector

 Comes on Power switch on (IG) again
C15C5 Motor Rotation Signal Not Detected The system enters test mode.

  • Steering actuator assembly

  • VGRS ECU (front steering control ECU)

  • Harness or connector

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WIRING DIAGRAM

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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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  • Since DTC C1289 is stored in the skid control ECU assembly, after performing repairs on the VGRS system, clear the DTCs for the electronically controlled brake system.

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PROCEDURE


  1. Click here

    CHECK DTC


    1. Check for DTCs.

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      1. Chassis > VGRS > Trouble Codes


      Result
      Result Proceed to

      • DTC C15A3 is output as a current DTC

      • When the power switch is turned on (READY) and the steering wheel is operated, DTC C15A3 is output as a current DTC.

      		 A
      When the power switch is turned on (READY) and a wire harness is jiggled, DTC C15A3 is output as a current DTC. B
      DTC C15A3 is not output as a current DTC C

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


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Display the DTCs on the GTS screen.

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      1. Chassis > VGRS > Trouble Codes


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

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      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

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    INSPECT STEERING ACTUATOR ASSEMBLY


    1. Turn the power switch off.

    2. Disconnect the G78 VGRS ECU (front steering control ECU) connector.

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

      Tip:

      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
      G78-9 (RV) - G78-8 (RG) Always 20 to 60 Ω
      G78-3 (S1) - G78-8 (RG) Always 70 to 160 Ω
      G78-5 (S2) - G78-8 (RG) Always 60 to 150 Ω
      G78-9 (RV) - G78-3 (S1) Always 90 to 220 Ω
      G78-9 (RV) - G78-5 (S2) Always 80 to 210 Ω
      G78-3 (S1) - G78-5 (S2) Always 130 to 310 Ω
      G78-3 (S1) - Body ground Always 100 kΩ or higher
      G78-5 (S2) - Body ground Always 100 kΩ or higher
      G78-8 (RG) - Body ground Always 100 kΩ or higher
      G78-9 (RV) - Body ground Always 100 kΩ or higher
      Result
      Proceed to
      OK
      NG

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


    1. Turn the power switch off.

    2. Disconnect the G78 VGRS ECU (front steering control ECU) connector.

    3. Disconnect the G33 steering actuator assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G78-3 (S1) - G33-2 (S1+) Always Below 1 Ω
      G78-5 (S2) - G33-9 (S2+) Always Below 1 Ω
      G78-8 (RG) - G33-10 (RG+) Always Below 1 Ω
      G78-9 (RV) - G33-1 (RV+) Always Below 1 Ω
      G78-9 (RV) - G78-8 (RG) Always 20 to 60 Ω
      G78-3 (S1) - G78-8 (RG) Always 70 to 160 Ω
      G78-5 (S2) - G78-8 (RG) Always 60 to 150 Ω
      G78-9 (RV) - G78-3 (S1) Always 90 to 220 Ω
      G78-9 (RV) - G78-5 (S2) Always 80 to 210 Ω
      G78-3 (S1) - G78-5 (S2) Always 130 to 310 Ω
      G78-3 (S1) or G33-2 (S1+) - Body ground Always 100 kΩ or higher
      G78-5 (S2) or G33-9 (S2+) - Body ground Always 100 kΩ or higher
      G78-8 (RG) or G33-10 (RG+) - Body ground Always 100 kΩ or higher
      G78-9 (RV) or G33-1 (RV+) - Body ground Always 100 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE STEERING ACTUATOR ASSEMBLYClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR