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 Code DTC Detection Condition Trouble Area
C1597/57

All conditions are met for approximately 3 seconds or more:


  • 3 seconds or more elapse after turning the power 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

WIRING DIAGRAM

A01FTQ1E01

INSPECTION PROCEDURE

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.

      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.

      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 power switch off.

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

    3. A01FTSRE02
      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.

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

      Tech Tips

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N104-10 (CAN+) - N104-11 (CAN-) Always 100 to 140 Ω
      N104-10 (CAN+) - Body ground Always 100 kΩ or higher
      N104-11 (CAN-) - Body ground Always 100 kΩ or higher

    NG

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

    OK

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


    1. Turn the power switch off.

    2. A01FRNFE01
      Text in Illustration
      *a

      Component without harness connected

      (VGRS ECU [Front Steering Control ECU])

      Disconnect the N104 VGRS ECU (front steering control ECU) connector.

    3. 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

    NG

    REPLACE FRONT STEERING CONTROL ECU Click here

    OK

  5. RECONFIRM DTC


    1. Reconnect the N104 VGRS ECU (front steering control ECU) connector.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC C1597/57 is not output A
      DTC C1597/57 is output B

    B

    REPLACE FRONT STEERING CONTROL ECU Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

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


    1. Turn the power switch off.

    2. A01FV3QE01
      Text in Illustration
      *a

      Component without harness connected

      (DRS ECU [Rear Steering Control ECU])

      Disconnect the U42 DRS ECU (rear steering control ECU) connector.

    3. 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

    NG

    REPLACE REAR STEERING CONTROL ECU Click here

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR