VARIABLE GEAR RATIO STEERING SYSTEM, Diagnostic DTC:C1597/57

DTC Code DTC Name
C1597/57 Lost Communication between VGRS and DRS

DESCRIPTION

The VGRS ECU (front steering control ECU) communicates with the DRS ECU (rear steering control ECU) via the local bus.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition
C1597/57 Lost Communication between VGRS and DRS

All conditions are met for approximately 3 seconds or more:


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

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

  • A problem is detected with the DRS ECU (rear steering control ECU) via CAN communication.

  • VGRS ECU (front steering control ECU)

  • DRS ECU (rear steering control ECU)

  • Harness or connector

 Comes on Engine switch on (IG) again

WIRING DIAGRAM

B0073E4E10
*1 VGRS ECU (Front Steering Control ECU)
*2 DRS ECU (Rear Steering Control ECU)

CAUTION / NOTICE / HINT

Note


  • When replacing the DRS ECU (rear steering control ECU), perform neutral position memorization and motor rotation angle sensor calibration.

    Click here

  • When replacing the VGRS ECU (front steering control ECU), perform actuator angle neutral position calibration and initialization after replacement.

    Click here

PROCEDURE


  1. CHECK FOR DTC (DYNAMIC REAR STEERING SYSTEM)


    1. Check for DTCs in the dynamic rear steering system.

      Click here


      Chassis > DRS > Trouble Codes
      Result
      Result Proceed to
      DTC U0130/41 is not output A
      DTC U0130/41 is output B

    B

    GO TO DYNAMIC REAR STEERING SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Click here

    A

  2. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Chassis > VGRS > Trouble Codes
      Result
      Result Proceed to
      DTC U0134/56 is not output A
      DTC U0134/56 is output B

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  3. CHECK HARNESS AND CONNECTOR (CAN+, CAN- TERMINAL)


    1. Turn the engine switch off.

    2. Check the connection condition of the VGRS ECU (front steering control ECU) connector and terminals.

    3. Disconnect the O16 VGRS ECU (front steering control ECU) connector.

    4. B0075TVC09
      *a

      Front view of wire harness connector

      (to VGRS ECU [Front Steering Control ECU])

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

      Tech Tips

      Measure the resistance of the wire harness and DRS ECU (rear steering control ECU) at the VGRS ECU (front steering control ECU) connector.

      Standard Resistance
      Tester Connection Condition Specified Condition
      O16-10 (CAN+) - O16-11(CAN-) Always 100 to 140 Ω
      O16-10 (CAN+) - Body ground Always 100 kΩ or higher
      O16-11 (CAN-) - Body ground Always 100 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT DRS ECU (REAR STEERING CONTROL ECU) (CAN+, CAN- TERMINAL) Click here

    OK

  4. INSPECT VGRS ECU (FRONT STEERING CONTROL ECU) (CAN+, CAN- TERMINAL)


    1. Turn the engine switch off.

    2. Disconnect the O16 VGRS ECU (front steering control ECU) connector.

    3. B0075XSC03
      *a

      Component without harness connected

      (VGRS ECU [Front Steering Control ECU])

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      10 (CAN+) - 11(CAN-) Always 100 to 140 Ω
      10 (CAN+) - Body ground Always 100 kΩ or higher
      11 (CAN-) - Body ground Always 100 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  5. RECONFIRM DTC


    1. Reconnect the O16 VGRS ECU (front steering control ECU) connector.

    2. Clear the DTCs.

      Click here


      Chassis > VGRS > Clear DTCs

    3. Check for DTCs.

      Click here


      Chassis > VGRS > Trouble Codes
      Result
      Result Proceed to
      DTC C1597/57 is not output A
      DTC C1597/57 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

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

  6. INSPECT DRS ECU (REAR STEERING CONTROL ECU) (CAN+, CAN- TERMINAL)


    1. Turn the engine switch off.

    2. Disconnect the U1 DRS ECU (rear steering control ECU) connector.

    3. B007349C03
      *a

      Component without harness connected

      (DRS ECU [Rear Steering Control ECU])

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      11 (CAN+) - 8 (CAN-) Always 100 to 140 Ω
      11 (CAN+) - Body ground Always 100 kΩ or higher
      8 (CAN-) - Body ground Always 100 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    REPLACE DRS ECU (REAR STEERING CONTROL ECU) Click here