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Home >> Subaru >> 2021 >> Crosstrek Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (P-HEV Hybrid Powertrain Control System (Diagnostics) (4 Of 4)) >> Diagnostics With Phenomenon >> Inspection >> Drive Start Control System

Drive Start Control System

WARNING: This page is about a different variant/trim than selected.
CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .
NOTE: The system output may become large at uphill and small at downhill even when the accelerator pedal is depressed at constant amount. However, this is due to operation of the driving torque control by the drive start control, and not a malfunction.
  1. CHECK SYMPTOMS  .

    Interview the customer and check the vehicle condition.

    If hunting, go to  A.

    If breathing or poor acceleration, go to  B.

    Yes: 

    1. Go to  2.
    2. Go to  8.

    No  -

  2. CHECK OPERATION HISTORY  .

    Check if an operation to activate the drive start control is performed.

    NOTE: During control at reversing and control at shift change, the driving torque is corrected based on slope inclination and steering angle.
    • Condition 1 (Control at reversing) Control operating condition
      • Shift position R
      • Accelerator pedal ON
        G13942405Courtesy of SUBARU OF AMERICA, INC.

        Control items

      • Restraining of driving torque Recovery conditions
      • Shift position other than R
      • Accelerator pedal OFF
    • Condition 2 (Control a at shift change) Control operating condition
      • From shift position P to D, or P to R
      • Accelerator pedal ON
        G13942406Courtesy of SUBARU OF AMERICA, INC.

        Control items

      • Restraining of driving torque Recovery conditions
      • Shift position P or N
      • Accelerator pedal OFF
    • Condition 3 (Control b at shift change) Control operating condition
      • From shift position R to D, D (including position B) to R, or N to R
      • Accelerator pedal ON
        G13942407Courtesy of SUBARU OF AMERICA, INC.

        Control items

      • Shift position P or N Recovery conditions
      • Shift position P or N
      • Accelerator pedal OFF

    Was the operation in the note above performed?

    Yes: 

    Go to  3.

    No: 

    System is normal.

  3. CHECK DTC  .

    Read the DTC of [Brake Control] using the Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS) (HEV)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Are any DTCs displayed?

    Yes: 

    Perform the diagnosis for the displayed DTCs.

    No: 

    Go to  4.

  4. CHECK DATA MONITOR (FR Wheel Speed, FL Wheel Speed, RR Wheel Speed, RL Wheel Speed)  .

    Using the Subaru Select Monitor, display the following items in the [Data Monitor] of [Brake Control]. Ref. to BRAKE CONTROL (DIAGNOSTICS) (HEV)>DATA MONITOR .

    • FR Wheel Speed
    • FL Wheel Speed
    • RR Wheel Speed
    • RL Wheel Speed

    Is the data as follows?

    At stall: 0 km/h (0 MPH)

    During driving at a constant speed (16 - 64 km/h (10 - 40 MPH)): Displayed speed does not fluctuate widely

    Yes: 

    Go to  5.

    No: 

    Perform the diagnosis for the brake control. Ref. to BRAKE CONTROL (DIAGNOSTICS) (HEV)>BASIC DIAGNOSTIC PROCEDURE .

  5. CHECK DATA MONITOR (Vehicle Speed)  .

    Using the Subaru Select Monitor, display the following items in the [Data Monitor] of [P-HEV Hybrid Powertrain Control]. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DATA MONITOR .

    • Vehicle Speed

      Is the data as follows?

      At stall: 0 km/h (0 MPH)

      During driving at a constant speed (16 - 64 km/h (10 - 40 MPH)): Displayed speed does not fluctuate widely

    Yes: 

    Go to  6.

    No: 

    Perform the diagnosis for the brake control. Ref. to BRAKE CONTROL (DIAGNOSTICS) (HEV)>BASIC DIAGNOSTIC PROCEDURE .

  6. CHECK DATA MONITOR (Yaw Rate Sensor)  .

    Using the Subaru Select Monitor, display the following items in the [Data Monitor] of [Brake Control]. Ref. to BRAKE CONTROL (DIAGNOSTICS) (HEV)>DATA MONITOR .

  7. CHECK DATA MONITOR (Steering Angle Sensor)  .

    Using the Subaru Select Monitor, display the following items in the [Data Monitor] of [Brake Control]. Ref. to BRAKE CONTROL (DIAGNOSTICS) (HEV)>DATA MONITOR .

    • Steering Angle Sensor

      Is the data as follows?

      When operating the steering to the left: Change to positive numbers continuously

      When operating the steering to the right: Change to negative numbers continuously

      Yes: 

      Go to  8.

      No: 

      Perform the diagnosis for the brake control. Ref. to BRAKE CONTROL (DIAGNOSTICS) (HEV)>BASIC DIAGNOSTIC PROCEDURE .

  8. CHECK OPERATION HISTORY  .

    Check if an operation to activate the drive start control is performed.

    NOTE: During control at reversing and control at shift change, the driving torque is corrected based on slope inclination and steering angle.
    • Condition 1 (Control at reversing)

      Control operating condition

      • Shift position R
      • Accelerator pedal ON
        G13942408Courtesy of SUBARU OF AMERICA, INC.

        Control items

      • Restraining of driving torque Recovery conditions
      • Shift position other than R
      • Accelerator pedal OFF
    • Condition 2 (Control a at shift change) Control operating condition
      • From shift position P to D, or P to R
      • Accelerator pedal ON
        G13942409Courtesy of SUBARU OF AMERICA, INC.

        Control items

      • Restraining of driving torque Recovery conditions
      • Shift position P or N
      • Accelerator pedal OFF
    • Condition 3 (Control b at shift change) Control operating condition
      • From shift position R to D, D (including position B) to R, or N to R
      • Accelerator pedal ON
        G13942410Courtesy of SUBARU OF AMERICA, INC.

        Control items

      • Shift position P or N Recovery conditions
      • Shift position P or N
      • Accelerator pedal OFF

    Was the operation in the note above performed?

    Yes: 

    Go to  9.

    No:  System is normal.

  9. CHECK DATA MONITOR (Shift Position)  .

    Using the Subaru Select Monitor, display the following items in the [Data Monitor] of [P-HEV Hybrid Powertrain Control]. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DATA MONITOR .

  10. CHECK DATA MONITOR (Accelerator Position Sensor No. 1 Voltage %, Accelerator Position Sensor No. 2 Voltage %)  .

    Using the Subaru Select Monitor, display the following items in the [Data Monitor] of [P-HEV Hybrid Powertrain Control]. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DATA MONITOR .

    • Accelerator Position Sensor No. 1 Voltage %
    • Accelerator Position Sensor No. 2 Voltage %

    Does the display change according to accelerator pedal operation?

    Yes: 

    System is normal.

    No: 

    Replace Accelerator pedal sensor. Ref. to General Description .

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