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Home >> Subaru >> 2016 >> BRZ Series.HyperBlue >> Repair and Diagnosis >> Engine Mechanical >> Starter >> Entry Start System Start System (Keyless Start) >> Entry & Start System (Start Function) >> DTC B2274: ACC Circuit Abnormal >> Inspection steps
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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 assembly), refer to "entry & start system (entry function)". (Refer to PARTS LOCATION )
  • 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. Checking the harnesses and connectors (power supply) (Refer to INSPECTION STEPS  )

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

    OK: Go to next step

  2. Checking the harnesses and connectors (grounding) (Refer to INSPECTION STEPS  )

    NG: Repair or replacement of the harnesses or connectors

    OK: Go to next step

  3. Checking the harnesses and connectors (instrument panel junction block assembly - collation ECM)
    1. Remove the D41 connector of the collation ECM (smart key ECM assembly).
    2. Remove the 3A connector of the instrument panel junction block assembly.
    3. Measure the resistance according to the following table.

      Resistance

      RESISTANCE REFERENCE

      Inspection terminals Inspection conditions Standard value
      D41-4 (ACCD) - 3A-20 Always 1 Ωor less
      3A-12 - chassis ground Always 1 Ωor less
      D41-4 (ACCD) - chassis ground Always 10 kΩ or more

      NG: Repair or replacement of the harnesses or connectors

      OK: Go to next step

  4. Unit inspection of the instrument panel junction block assembly (ACC relay)
    1. Remove the instrument panel junction block assembly.
    2. Remove the main body ECM (multiplex network body ECM) from the instrument panel junction block assembly.
    3. Measure the resistance according to the following table.
      Fig 1: Instrument Panel Junction Block Assembly Connector Terminal Identification
      G10216322Courtesy of SUBARU OF AMERICA, INC.

      Resistance

      RESISTANCE REFERENCE

      Inspection terminals Inspection conditions Standard value
      3E-1 - 3B-28 When there is no battery voltage 10 kΩ or more
      When battery voltage is applied to terminals 3A-20 and 3A-12 1 Ωor less
      3E-1 - 3A-10 When there is no battery voltage 10 kΩ or more
      When battery voltage is applied to terminals 3A-20 and 3A-12 1 Ωor less

      NG: Replacement of the instrument panel junction block assembly

      OK: Go to next step

  5. Unit inspection of the collation ECM (smart key ECM assembly)
    1. Install the main body ECM (multiplex network body ECM) on the instrument panel junction block assembly.
    2. Install the instrument panel junction block assembly.
    3. Reconnect the D41 connector of the collation ECM (smart key ECM assembly).
    4. Measure the voltage according to the following table.

      Voltage

      VOLTAGE REFERENCE

      Inspection terminals Inspection conditions Standard value
      D41-4 (ACCD) - chassis ground Engine switch off →Engine switch on (ACC) 1V or less →8.5V or more
      Fig 2: Collation ECM (Smart Key ECM Assembly) Connector Terminal Identification
      G10216323Courtesy of SUBARU OF AMERICA, INC.

      NG: Replacement of the collation ECM (smart key ECM assembly)

      OK: Complete (Possibly temporary poor contact)

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