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

DTC Code DTC Name
C15A2/62 Actuator Malfunction
C15A6/62 Actuator Malfunction

DESCRIPTION

The steering control ECU drives the actuator based on steering angle sensor signals and vehicle speed signals.

If the steering control ECU detects excessive current flowing into the steering actuator, or an internal malfunction, it will turn on the master warning light, store DTC C15A2/62, and stop VGRS operation.

If the steering control ECU detects a malfunction in the pre driver circuit, it will turn the master warning light on, store DTC C15A6/62, and stop VGRS operation.

DTC Code Detection Condition Trouble Area
C15A2/62 The VGRS system detects a malfunction in the motor drive circuit

  • Harness or connector

  • Power source circuit

  • Steering actuator

  • Steering control ECU
C15A6/62 The actual motor current value greatly differs from the estimated value

  • Power source circuit

  • Harness or connector

  • Steering actuator

  • Steering control ECU

WIRING DIAGRAM

A01H0RGE02

INSPECTION PROCEDURE

Tech Tips

The actuator only can be checked in this procedure. If it is normal, the steering control ECU is faulty.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

    A01GZ9KE01

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A42-7 (PGND) - Body ground Always Below 1 Ω

    2. Turn the power switch ON (IG).

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

      Standard voltage
      Tester Connection Condition Specified Condition
      A42-8 (PIG) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR FUSE

    OK

  2. CHECK HARNESS AND CONNECTOR (STEERING CONTROL ECU - STEERING ACTUATOR)

    A01H1HYE04

    1. Disconnect the A43 steering control ECU connector.

    2. Disconnect the z15 steering actuator connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A43-1 (BMV) - A43-2 (BMU) Always 10 kΩ or higher
      A43-1 (BMV) - A43-3 (BMW)
      A43-2 (BMU) - A43-3 (BMW)
      A43-1 (BMV) - z15-2 (V) Always Below 1 Ω
      A43-2 (BMU) - z15-3 (U)
      A43-3 (BMW) - z15-1 (W)
      A43-1 (BMV) - Body ground Always 10 kΩ or higher
      A43-2 (BMU) - Body ground
      A43-3 (BMW) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK STEERING ACTUATOR


    1. A01H0V0E01

      Disconnect the A43 steering control ECU connector.

      Tech Tips

      The resistance must be measured after the steering actuator connector is connected.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A43-1 (BMV) - A43-2 (BMU) Always Below 1 Ω
      A43-1 (BMV) - A43-3 (BMW)
      A43-2 (BMU) - A43-3 (BMW)
      A43-1 (BMV) - Body ground Always 10 kΩ or higher
      A43-2 (BMU) - Body ground
      A43-3 (BMW) - Body ground

    NG

    REPLACE STEERING ACTUATOR Click here

    OK

  4. CHECK DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      C15A1/61 is not output OK
      C15A1/61 is output NG

    NG

    REPLACE STEERING ACTUATOR Click here

    OK

    REPLACE STEERING CONTROL ECU Click here