LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 2018 >> BRZ Limited, Standard Trans >> Repair and Diagnosis >> Electrical >> Starter >> Entry Start System Start System (Keyless Start) >> Entry & Start System (Start Function) >> DTC B2282: Vehicle Speed Signal Abnormal; DTC B2283 Vehicle Speed Sensor Fault Detection >> Inspection steps
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Inspection steps

CAUTION:
  • The entry & start system has functions that use the CAN communication. Before performing troubleshooting, perform the inspection in "How to troubleshoot", and check that there are no communication problems. (Refer to HOW TO PROCEED WITH TROUBLESHOOTING )
  • Before replacing the collation ECM (smart key ECM ASSY), refer to "entry & start system (entry function)". (Refer to ENTRY & START SYSTEM (ENTRY FUNCTION) )
  • After repair, perform the [DTC output confirmation operation], and check that the DTC is not output again.
  • Before performing the following inspection steps, check the fuses related to this system.
  1. Reading the values using the SSM4 (vehicle speed)
    1. Connect the SSM4 to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn on the SSM4.
    4. Enter the following menus: [Brake Control System] →[Data monitor]
    5. Based on the contents of the SSM4 display, read the [Data monitor].
      RANGE DESCRIPTION - ABS/VSC/TRC

      Tester display Measurement items/range Normal condition Notes for diagnosis
      [Wheel speed] Vehicle speed/hour: 0 km/h {0 MPH}, maximum speed:
      255 km/h {158MPH}      		 Almost the same speed as the actual vehicle speed (speedometer tester) -

      Criteria: [Data monitor] is almost the same as the actual vehicle speed.

      OK: Go to next step

      NG: VSC system (How to troubleshoot) (Refer to HOW TO TROUBLESHOOT )

  2. Reading the values using the SSM4 (vehicle speed signal)
    1. Connect the SSM4 to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn on the SSM4.
    4. Input the following menus: [Keyless Access(Power Supply ECM)] →[Data monitor]
    5. Based on the contents of the SSM4 display, read the [Data monitor].
      RANGE DESCRIPTION - POWER SOURCE CONTROL

      Tester display Measurement items/range Normal condition Notes for diagnosis
      [Vehicle speed signal] Vehicle in running or stopped status/[stopped] or [rotating] [Rotating] Vehicle is running at a speed of 5 km/h {3 MPH} or faster.
      Stop: The vehicle is stopped.      		 -

      Criteria: Based on the vehicle speed, [Stop] (the vehicle is stopped) or [Driving] (the vehicle is running) is displayed on the screen.

      OK: Go to next step

      NG: Go to Step 3.

      Proceed to the "vehicle stability control system" ("How to troubleshoot")

  3. Checking the harnesses and connectors (power supply) (Refer to DTC B2274 ACC CIRCUIT ABNORMAL )

    OK: Go to next step

    NG: Repair or replacement of the harnesses or connectors of the circuits that connect to the power source

  4. Checking the harnesses and connectors (grounding) (Refer to DTC B2274 ACC CIRCUIT ABNORMAL )

    OK: Go to next step

    NG: Repair or replacement of the harnesses or connectors

  5. Checking the harnesses and connectors (collation ECM - combination meter ASSY)
    1. Remove the D41 connector of the collation ECM (smart key ECM ASSY).
    2. Disconnect the connector A5 of the brake actuator ASSY (skid control ECM).
    3. Measure the resistance according to the following table.
      STANDARD VALUE SPECIFICATION - RESISTANCE

      Inspection terminals Inspection conditions Standard value
      D41-27 (SPD) - A5-2 (SPD) Always 1 Ω or less
      D41-27 (SPD) - chassis ground Always 10 kΩ or more

      OK: Go to next step

      NG: Repair or replacement of the harnesses or connectors

  6. Unit inspection of the collation ECM (smart key ECM ASSY)
    G12589377Courtesy of SUBARU OF AMERICA, INC.
    1. Reconnect the connector A5 of the brake actuator ASSY (skid control ECM).
    2. Reconnect the D41 connector of the collation ECM (smart key ECM ASSY).
    3. Using an oscilloscope, check the waveform of the vehicle speed input signal sent from the combination meter of the collation ECM (smart key ECM ASSY) terminal.
      1. Refer to the table below and check the signal waveform.
        Item Contents
        Tester connection D41-27 (SPD) - D48-11 (GND)
        Tool setting 5 V/DIV., 100 ms./DIV.
        Conditions The engine switch on (IG), the vehicle running at approx. 5 km/h {3 MPH}

        Criteria: The waveform resembles the waveform shown in the figure.

        NOTE: If the system is functioning properly, 4 pulses are generated for each wheel revolution. The faster the vehicle speed, the shorter the width shown in the figure (A) becomes.

        OK: Go to next step

        NG: Proceed to the "vehicle stability control system" ("How to troubleshoot")

        Replacement of the collation ECM (smart key ECM ASSY)

scientia non olet · About LEMON Manuals