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Home >> Subaru >> 2015 >> BRZ Series.Blue, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnostics (2 Of 3) >> DTC P0512 Starter Switch Circuit High input; DTC P0616 Starter Relay Circuit Low; DTC P0617 Starter Relay Circuit High; DTC P081A Starter Cut Relay System Circuit (Low) >> Description of functions >> Inspection steps

Inspection steps

CAUTION: Before performing troubleshooting, check the fuse for this circuit.
NOTE: Read the freeze frame data using the SSM3. A part of the engine running conditions under which the engine trouble occurred is recorded in the freeze frame data, which is useful for troubleshooting.
  1. Read SSM3 data ([starter switch])
    1. Connect the SSM3 to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn on the SSM3.
    4. Select the following menu items using the SSM3. [Inspection of BRZ]/[Each System Check]/[Engine Control System]/[Current Data Display & Save]/[Starter Switch]
    5. Read [starter switch].

      Voltage

      RESISTANCE REFERENCE (SHORT CIRCUIT CHECK)

      Item name Inspection conditions Standard value
      [Starter Switch] IG ON OFF
      When cranking ON

      Result

      Result Go to
      Abnormal (models without smart entry & start system) A
      Abnormal (models with smart entry & start system) B
      Normal C

      B: Go to Step  4.

      C: Go to Step  9.

      A: Go to next step

  2. Relay unit inspection (ST relay)
    1. Perform ST relay unit inspection. (refer to RELAY )

      NG: Relay replacement (ST relay)

      OK: Go to next step

  3. Check wiring harness and connector (ST relay - engine control computer)
    NOTE: refer to INSPECTION PROCEDURES FOR ELECTRICAL CIRCUITS AND HOW TO PERFORM for inspection procedure and precautions of wiring harness and connector.
    1. Disconnect the connector for the engine control computer.
    2. Remove the ST relay from the engine compartment relay block.
    3. Measure the resistance between the terminals. (Refer to ECM TERMINAL ARRANGEMENT for the terminal arrangement)

      Resistance (open circuit check)

      RESISTANCE REFERENCE (SHORT CIRCUIT CHECK)

      Inspection terminals Inspection conditions Standard value
      3 (ST relay holder) - A33-17 (STSW) Always Less than 1 Ω
      1 (ST relay holder) - A35-26 (STA) Always Less than 1 Ω

      Resistance (short circuit check)

      RESISTANCE REFERENCE (SHORT CIRCUIT CHECK)

      Inspection terminals Inspection conditions Standard value
      3 (ST relay holder) and A33-17 (STSW) - other terminals and chassis ground Always 10 k Ωor more
      1 (ST relay holder) and A35-26 (STA) - other terminals and chassis ground Always 10 k Ωor more
      CAUTION:
      • When using tester probes to take measurements at a relay holder, do not push them hard against the holder. Otherwise the holder could be damaged.

      NG: Repair or replacement of wiring harness or connector

      OK: Starter system check (models without smart entry & start system) (Refer to STARTER SYSTEM (MODELS WITHOUT SMART ENTRY & START SYSTEM) )

  4. Read SSM3 data ([starter cut relay])
    1. Connect the SSM3 to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn on the SSM3.
    4. Select the following menu items using the SSM3. [Inspection of BRZ]/[Each System Check]/[Engine Control System]/[Current Data Display & Save]/[Starter cut relay]
    5. Read [Starter cut relay].

      Voltage

      RESISTANCE REFERENCE (SHORT CIRCUIT CHECK)

      Item name Inspection conditions Standard value
      [Starter cut relay] IG ON OFF
      When cranking ON

      NG: Go to Step  7.

      OK: Go to next step

  5. Relay unit inspection (ST relay)
    1. Perform ST relay unit inspection. (refer to RELAY )

      NG: Relay replacement (ST relay)

      OK: Go to next step

  6. Check wiring harness and connector (ST relay - engine control computer)
    NOTE: refer to INSPECTION PROCEDURES FOR ELECTRICAL CIRCUITS AND HOW TO PERFORM for inspection procedure and precautions of wiring harness and connector.
    1. Disconnect the connector for the engine control computer.
    2. Remove the ST relay from the engine compartment relay block.
    3. Measure the resistance between the terminals. (Refer to ECM TERMINAL ARRANGEMENT for the terminal arrangement)

      Resistance (open circuit check)

      RESISTANCE REFERENCE (SHORT CIRCUIT CHECK)

      Inspection terminals Inspection conditions Standard value
      3 (ST relay holder) - A33-14 (STSW2) Always Less than 1 Ω
      1 (ST relay holder) - A35-26 (STA) Always Less than 1 Ω

      Resistance (short circuit check)

      RESISTANCE REFERENCE (SHORT CIRCUIT CHECK)

      Inspection terminals Inspection conditions Standard value
      3 (ST relay holder) and A33-14 (STSW2) - other terminals and chassis ground Always 10 k Ωor more
      1 (ST relay holder) and A35-26 (STA) - other terminals and chassis ground Always 10 k Ωor more
      CAUTION: When using tester probes to take measurements at a relay holder, do not push them hard against the holder. Otherwise the holder could be damaged.

      NG: Repair or replacement of wiring harness or connector

      OK: Starter system check (models with smart entry & start system) (Refer to STARTER SYSTEM (MODELS WITH SMART ENTRY & START SYSTEM) )

  7. Relay unit inspection (ST CUT relay)
    1. Perform ST CUT relay unit inspection. (refer to RELAY )

      NG: Relay replacement (ST CUT relay)

      OK: Go to next step

  8. Check wiring harness and connector (ST CUT relay - engine control computer)
    NOTE: refer to INSPECTION PROCEDURES FOR ELECTRICAL CIRCUITS AND HOW TO PERFORM for inspection procedure and precautions of wiring harness and connector.
    1. Disconnect the connector for the engine control computer.
    2. Remove the ST CUT relay from the engine compartment relay block.
    3. Measure the resistance between the terminals. (Refer to ECM TERMINAL ARRANGEMENT for the terminal arrangement)

      Resistance (open circuit check)

      RESISTANCE REFERENCE (SHORT CIRCUIT CHECK)

      Inspection terminals Inspection conditions Standard value
      1 (ST CUT relay holder) - A35-34 (STAR) Always Less than 1 Ω

      Resistance (short circuit check)

      RESISTANCE REFERENCE (SHORT CIRCUIT CHECK)

      Inspection terminals Inspection conditions Standard value
      1 (ST CUT relay holder) and A35-34 (STAR) - other terminals and chassis ground Always 10 k Ωor more
      CAUTION: When using tester probes to take measurements at a relay holder, do not push them hard against the holder. Otherwise the holder could be damaged.

      NG: Repair or replacement of wiring harness or connector

      OK: Starter system check (models with smart entry & start system) (Refer to STARTER SYSTEM (MODELS WITH SMART ENTRY & START SYSTEM) )

  9. Clear DTC
    1. Connect the SSM3 to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn on the SSM3.
    4. Follow the SSM3 on-screen instructions to clear the DTCs. (Refer to CHECKING/CLEARING DTC )
    5. Turn the ignition switch to OFF, and wait for 30 seconds.

      Next

  10. Perform test drive for operation check
    1. Perform test drive. (Refer to "TEST DRIVE " under "Description of functions")
    2. Follow the SSM3 on-screen instructions to check the DTC. (Refer to CHECKING/CLEARING DTC )
      Result Go to
      No DTC is output A
      P0512, P0616, P0617, or P081A is output. B

      B: Replacement of the engine control computer (refer to REMOVAL )

      A: Inspection for problems that do not normally occur (Refer to CHECKING/CLEARING DTC )

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