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Home >> Subaru >> 2019 >> BRZ Limited, Automatic Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (2 Of 3) >> EFI System (FA20) >> DTC P0351: Ignition Coil "A" Primary/Secondary Circuit; DTC P0352: Ignition Coil "B" Primary/Secondary Circuit; DTC P0353: Ignition Coil "C" Primary/Secondary Circuit; DTC P0354: Ignition Coil "D" Primary/Secondary Circuit >> Description of functions >> Inspection steps

Inspection steps

CAUTION: Before performing troubleshooting, check the fuse for this circuit.
NOTE:
  • If DTC P0351 is displayed, check the ignition coil ASSY No. 1 circuit.
  • If DTC P0352 is displayed, check the ignition coil ASSY No. 2 circuit.
  • If DTC P0353 is displayed, check the ignition coil ASSY No. 3 circuit.
  • If DTC P0354 is displayed, check the ignition coil ASSY No. 4 circuit.
  • Read the freeze frame data using the SSM4. 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. Clear DTC
    1. Connect the SSM4 to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn on the SSM4.
    4. Follow the SSM4 on-screen instructions to clear the DTCs. (Refer to CHECKING/CLEARING DTC )
    5. Turn the ignition switch to OFF, and wait for 30 seconds.
  2. Perform test drive for operation check
    1. Change the position of the ignition coil ASSY and test drive the vehicle.

      (Refer to "TEST DRIVE " under "Description of functions")

      CAUTION: Do not change the position of the ignition coil connectors.
    2. With IG ON, follow the SSM4 on-screen instructions to check the DTC.

      (Refer to CHECKING/CLEARING DTC )

    RESULT DESCRIPTION

    Result Go to
    DTC does not change. A
    DTCs with different igniter system are output. B

    A: Go to next step

    B: Replacement of ignition coil ASSY (Refer to REMOVAL )

  3. Check wiring harness and connector (ignition coil ASSY power supply circuit)
    NOTE: For the inspection procedure and precautions for wiring harnesses and connectors, refer to INSPECTION PROCEDURES FOR ELECTRICAL CIRCUITS AND HOW TO PERFORM .
    1. Disconnect the connector of the ignition coil ASSY.
    2. Measure the voltage between the terminals.
    VOLTAGE SPECIFICATION

    Inspection terminals Inspection conditions Standard value
    C44-1 (+B) - chassis ground IG ON 11 to 14 V
    C42-1 (+B) - chassis ground IG ON 11 to 14 V
    C45-1 (+B) - chassis ground IG ON 11 to 14 V
    C43-1 (+B) - chassis ground IG ON 11 to 14 V
    G12586219Courtesy of SUBARU OF AMERICA, INC.

    NG: Repair or replacement of wiring harness or connector

    OK: Go to next step

  4. Check wiring harness and connector (ignition coil ASSY - chassis ground)
    NOTE: For the inspection procedure and precautions for wiring harnesses and connectors, refer to INSPECTION PROCEDURES FOR ELECTRICAL CIRCUITS AND HOW TO PERFORM .
    1. Disconnect the connector of the ignition coil ASSY.
    2. Measure the resistance between the terminals.
    STANDARD VALUE RESISTANCE SPECIFICATION (OPEN CIRCUIT CHECK)

    Inspection terminals Inspection conditions Standard value
    C44-2 (GND) - chassis ground Always Less than 1 Ω
    C42-2 (GND) - chassis ground Always Less than 1 Ω
    C45-2 (GND) - chassis ground Always Less than 1 Ω
    C43-2 (GND) - chassis ground Always Less than 1 Ω

    NG: Repair or replacement of wiring harness or connector

    OK: Go to next step

  5. Check wiring harness and connector (engine control computer - ignition coil ASSY)
    NOTE: For the inspection procedure and precautions for wiring harnesses and connectors, refer to INSPECTION PROCEDURES FOR ELECTRICAL CIRCUITS AND HOW TO PERFORM .
    1. Disconnect the connector for the engine control computer.
    2. Disconnect the connector of the ignition coil ASSY.
    3. Measure the resistance between the terminals. (For terminal arrangement, Refer to ECM TERMINAL ARRANGEMENT .)
    STANDARD VALUE RESISTANCE SPECIFICATION (OPEN CIRCUIT CHECK)

    Inspection terminals Inspection conditions Standard value
    A36-21 (IGT1) - C44-3 Always Less than 1 Ω
    A36-10 (IGT2) - C42-3 Always Less than 1 Ω
    A36-31 (IGT3) - C45-3 Always Less than 1 Ω
    A36-8 (IGT4) - C43-3 Always Less than 1 Ω
    STANDARD VALUE RESISTANCE SPECIFICATION (SHORT CIRCUIT CHECK)

    Inspection terminals Inspection conditions Standard value
    A36-21 (IGT1) and C44-3 (IGT1) - other terminals and chassis ground Always 10 k Ωor more
    A36-10 (IGT2) and C42-3 (IGT2) - other terminals and chassis ground Always 10 k Ωor more
    A36-31 (IGT3) and C45-3 (IGT3) - other terminals and chassis ground Always 10 k Ωor more
    A36-8 (IGT4) and C43-3 (IGT4) - other terminals and chassis ground Always 10 k Ωor more

    NG: Repair or replacement of wiring harness or connector

    OK: Go to next step

    Replacement of the engine control computer (Refer to REMOVAL )

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