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

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DTC Code DTC Name
C15A2/62 Actuator Malfunction
C15A6/62 Actuator Malfunction
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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 motor drive circuit, it will turn the master warning light on, store DTC C15A6/62, and stop VGRS operation.

DTC Code DTC 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
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Tip:

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

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PROCEDURE


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    CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E77-7 (PGND) - Body ground Always Below 1 Ω
      E78-8 (PGD2) - Body ground

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E77-8 (PIG) - Body ground Always 11 to 14 V

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


    1. Disconnect the E78 steering control ECU connector.

    2. Disconnect the E80 steering actuator connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E78-1 (BMV) - E78-2 (BMU) Always 10 kΩ or higher
      E78-1 (BMV) - E78-3 (BMW)
      E78-2 (BMU) - E78-3 (BMW)
      E78-1 (BMV) - E80-5 (BMV+) Always Below 1 Ω
      E78-2 (BMU) - E80-4 (BMU+)
      E78-3 (BMW) - E80-13 (BMW+)
      E78-1 (BMV) - Body ground Always 10 kΩ or higher
      E78-2 (BMU) - Body ground
      E78-3 (BMW) - Body ground

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    CHECK STEERING ACTUATOR


    1. A0159Q6E03

      Disconnect the E78 steering control ECU connector.

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

      Tip:

      The resistance must be measured with the steering actuator connector connected.

      Standard Resistance
      Tester Connection Condition Specified Condition
      E78-1 (BMV) - E78-2 (BMU) Always Below 1 Ω
      E78-1 (BMV) - E78-3 (BMW)
      E78-2 (BMU) - E78-3 (BMW)
      E78-1 (BMV) - Body ground Always 10 kΩ or higher
      E78-2 (BMU) - Body ground
      E78-3 (BMW) - Body ground

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    CHECK DTC


    1. Check for DTCs (Click here).

      Table 1. Result
      Result Proceed to
      C15A1/61 is output A
      C15A1/61 is not output (for LHD) B
      C15A1/61 is not output (for RHD) C

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    REPLACE STEERING CONTROL ECUClick here

  6. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE STEERING ACTUATOR ASSEMBLYClick here

  8. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE STEERING CONTROL ECUClick here