VARIABLE GEAR RATIO STEERING SYSTEM, Diagnostic DTC:C15A1/61, C15A2/62, C15A6/62

DTC Code DTC Name
C15A1/61 Actuator Malfunction
C15A2/62 Open in Motor Circuit
C15A6/62 Actuator Motor Power Distribution Malfunction

DESCRIPTION

If the VGRS ECU (steering control ECU) detects excessive current, it stores DTC C15A1/61, turns on the master warning light.

If the VGRS ECU (steering control ECU) detects excessive current flowing into the steering actuator assembly or an internal malfunction, it turns the master warning light on, and stores DTC C15A2/62.

If the VGRS ECU (steering control ECU) detects a malfunction in the motor drive circuit, it turns the master warning light on, and stores DTC C15A6/62.

DTC No. DTC Detection Condition Trouble Area
C15A1/61

Either condition is met:


  • After the engine switch is turned on (IG), a short in the motor circuit or an internal ECU (motor drive circuit) malfunction continues for 1.2 seconds or more before control starts.

  • After the engine switch is turned on (IG), a short in the motor circuit or an internal ECU (motor drive circuit) malfunction continues for 0.03 seconds or more.

  • Steering actuator assembly

  • VGRS ECU (steering control ECU)

  • Harness or connector
C15A2/62

Either condition is met:


  • After the engine switch is turned on (IG), an open in the motor circuit or an internal ECU (motor drive circuit) malfunction continues for 1.2 seconds or more before control starts.

  • After the engine switch is turned on (IG), an open in the motor circuit or an internal ECU (motor drive circuit) malfunction continues for 0.03 seconds or more.

  • Steering actuator assembly

  • VGRS ECU (steering control ECU)

  • Harness or connector
C15A6/62

Either condition is met:


  • After the engine switch is turned on (IG), an open in the motor circuit or an internal ECU (motor drive circuit) malfunction continues for 1.2 seconds or more before control starts.

  • After the engine switch is turned on (IG), an open in the motor circuit or an internal ECU (motor drive circuit) malfunction continues for 0.03 seconds or more.

  • Steering actuator assembly

  • VGRS ECU (steering control ECU)

  • Harness or connector

WIRING DIAGRAM

A01WSODE11

CAUTION / NOTICE / HINT

Note


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

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

When DTC C15A2/62 is output, a short circuit inside the steering actuator assembly or inside the VGRS ECU (steering control ECU) is suspected.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (PIG, PGND TERMINAL)


    1. A01WU6DE03
      Text in Illustration
      *a

      Component with harness connected

      (VGRS ECU [Steering Control ECU])

      Turn the engine switch off.

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

      Tech Tips

      Perform the inspection from the rear of the connector with the connector connected to the VGRS ECU (steering control ECU).

      Standard Resistance
      Tester Connection Condition Specified Condition
      E127-1(PGND) - Body ground Always Always

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E127-2(PIG) - E127-1(PGND) Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT STEERING ACTUATOR ASSEMBLY


    1. A01WVJRE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to VGRS ECU [Steering Control ECU])

      Disconnect the VGRS ECU (steering control ECU) connector.

    2. 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 (steering control ECU).

      Standard Resistance
      Tester Connection Condition Specified Condition
      E128-2 (BMV) - E128-3 (BMU) Always Below 1 Ω
      E128-2 (BMV) - E128-1 (BMW) Always Below 1 Ω
      E128-3 (BMU) - E128-1 (BMW) Always Below 1 Ω
      E128-1 (BMW) - Body ground Always 100 kΩ or higher
      E128-2 (BMV) - Body ground Always 100 kΩ or higher
      E128-3 (BMU) - Body ground Always 100 kΩ or higher
      Result
      Result Proceed to
      The resistance value deviates from the standard A
      The resistance value is within the standard B

    B

    RECONFIRM DTC Click here

    A

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


    1. Turn the engine switch off.

    2. Disconnect the E128 VGRS ECU (steering control ECU) connector.

    3. Disconnect the E85 steering actuator assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E128-2 (BMV) - E85-5 (BMV+) Always Below 1 Ω
      E128-3 (BMU) - E85-4 (BMU+) Always Below 1 Ω
      E128-1 (BMW) - E85-13 (BMW+) Always Below 1 Ω
      E128-2 (BMV) - E128-3 (BMU) Always 100 kΩ or higher
      E128-2 (BMV) - E128-1 (BMW) Always 100 kΩ or higher
      E128-3 (BMU) - E128-1 (BMW) Always 100 kΩ or higher
      E128-2 (BMV) or E85-5 (BMV+) - Body ground Always 100 kΩ or higher
      E128-3 (BMU) or E85-4 (BMU+) - Body ground Always 100 kΩ or higher
      E128-1 (BMW) or E85-13 (BMW+) - Body ground Always 100 kΩ or higher

    OK

    REPLACE STEERING ACTUATOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. RECONFIRM DTC


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

    2. Clear the DTCs Click here.

    3. Start the engine.

    4. Check for DTCs Click here.

      Result
      Result Proceed to
      DTCs C15A1/61, C15A2/62 and C15A6/62 is not output (for LHD) A
      DTCs C15A1/61, C15A2/62 and C15A6/62 is not output (for RHD) B
      DTCs C15A1/61, C15A2/62 and C15A6/62 is output C

    A

    REPLACE VGRS ECU (STEERING CONTROL ECU) Click here

    B

    REPLACE VGRS ECU (STEERING CONTROL ECU) Click here

    C

    REPLACE STEERING ACTUATOR ASSEMBLY Click here