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Home >> Subaru >> 2020 >> BRZ tS >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (Service Information) >> Ignition System (FA20) >> On-Vehicle Inspection
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On-Vehicle Inspection

G12586359Courtesy of SUBARU OF AMERICA, INC.
  1. Ignition coil ASSY inspection
    1. Input voltage inspection
      1. Disconnect the connector of the ignition coil ASSY.
      2. Turn the ignition switch to ON.
      3. Check the voltage between terminals of the vehicle side connector for the ignition coil ASSY.
        VOLTAGE SPECIFICATION

        Inspection terminals Inspection conditions Standard value
        C44-1 - chassis ground IG ON 11 to 14 V
        C42-1 - chassis ground IG ON 11 to 14 V
        C45-1 - chassis ground IG ON 11 to 14 V
        C43-1 - chassis ground IG ON 11 to 14 V
      4. Turn the ignition switch to OFF.
  2. Spark Inspection
    1. Check the DTC. (Refer to MALFUNCTION ANALYSIS USING CHECK LIST FOR INTERVIEW )
      CAUTION: When DTC is detected, perform the troubleshooting for DTC.
    2. Remove 4 ignition coils and 4 spark plugs. (Refer to REMOVAL )
    3. Use the following procedures to remove the SST.
      1. Using the SST, lift the engine ASSY.

        SST 99099AJ000, 18679AA020 

        G12586360Courtesy of SUBARU OF AMERICA, INC.
      2. Remove the SST.

        SST 18632AA020 

        G12586361Courtesy of SUBARU OF AMERICA, INC.
      3. Install the two nuts of the new engine mounting.

        Standard value: T=60N.m {612kgf.cm} {44.2ft.lbf} 

      G08553964Courtesy of SUBARU OF AMERICA, INC.
    4. Remove the 2 bolts, and remove the intake manifold protector (bank 1 side).
      G12586363Courtesy of SUBARU OF AMERICA, INC.
    5. Disconnect 2 connectors for the fuel injector and disconnect the clamp.
    6. Install the intake manifold protector (bank 1 side).
      G12586364Courtesy of SUBARU OF AMERICA, INC.
    7. Install the injector driver.
      NOTE: Leave 2 upper connectors disconnected.
      G12586365Courtesy of SUBARU OF AMERICA, INC.
    8. Disconnect 2 connectors for the fuel injector and disconnect the clamp.
    9. Reconnect the battery ground terminal.

      Standard value: T=6.0N.m {61kgf.cm} {4.4ft.lbf} 

    10. Install the air cleaner case SUB-ASSY.
    11. Attach the spark plug to the ignition coil ASSY, and connect the connector.
    12. Ground the spark plug.
    13. Check that the ignition spark is fired when the engine is cranked.
      CAUTION:
      • The ground electrode of the spark plug must be checked with the hexagonal part or threaded part grounded.
      • When the ignition coil is exposed to physical shock such as dropping, always replace it with a new one.
      • Do not crank the engine for 2 seconds or more.
      • For models with smart entry & start system, the cranking hold control makes the engine cranking continue for a certain period of time if the engine does not start. When stopping cranking the engine, press the engine switch again.
    14. Check that the connector for the ignition coil ASSY is connected securely.
      RESULT DESCRIPTION

      Result Go to
      NG Connect the connector securely.
      OK Next
    15. Inspection of ignition coil ASSY
      1. When there is a cylinder in which the ignition does not occur, replace the ignition coil ASSY for abnormal ignition cylinder with that for normal ignition cylinder.
      2. Check that the ignition spark is fired when the engine is cranked.
      RESULT DESCRIPTION

      Result Go to
      OK Replace the ignition coil ASSY.
      NG Next
    16. Inspection of the spark plug (Refer to Step 3 below)
      RESULT DESCRIPTION

      Result Go to
      NG Replace the spark plug.
      OK Next
    17. Inspection of wiring harness and connector for ignition coil ASSY (power supply circuit) (Refer to INSPECTION STEPS )
      RESULT DESCRIPTION

      Result Go to
      NG Repair or replace the harness or connector for the power supply circuit.
      OK Next
    18. Inspection of camshaft position sensor
      1. Inspection of intake side (Refer to DTC P0340 CAMSHAFT POSITION SENSOR "A" CIRCUIT (BANK 1 OR SINGLE SENSOR); DTC P0341 CAMSHAFT POSITION SENSOR "A" CIRCUIT RANGE/PERFORMANCE (BANK 1); DTC P0345 CAMSHAFT POSITION SENSOR "A" CIRCUIT (BANK 2); DTC P0346 CAMSHAFT POSITION SENSOR "A" CIRCUIT RANGE/PERFORMANCE (BANK 2)
      2. Inspection of exhaust side (Refer to DTC P0365 CAMSHAFT POSITION SENSOR "B" CIRCUIT (BANK 1); DTC P0366 CAMSHAFT POSITION SENSOR "B" CIRCUIT RANGE/PERFORMANCE (BANK 1); DTC P0390 CAMSHAFT POSITION SENSOR "B" CIRCUIT (BANK 2); DTC P0391 CAMSHAFT POSITION SENSOR "B" CIRCUIT RANGE/PERFORMANCE (BANK 2)
    19. Inspection of crankshaft position sensor (Refer to DTC P0335 CRANKSHAFT POSITION SENSOR "A" CIRCUIT; DTC P0336 CRANK ANGLE SENSOR CHARACTERISTIC )
    20. Check the IGT signal system circuit. (Refer to 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
    21. Disconnect the battery ground terminal.
    22. Remove the air cleaner case SUB-ASSY.
      G12586366Courtesy of SUBARU OF AMERICA, INC.
    23. Remove the three bolts and remove the injector driver.
      G08553964Courtesy of SUBARU OF AMERICA, INC.
    24. Remove the 2 bolts, and remove the intake manifold protector (bank 1 side).
      G12586368Courtesy of SUBARU OF AMERICA, INC.
    25. Connect 2 connectors for the fuel injector and connect the clamp.
    26. Using 2 bolts, install the intake manifold protector (bank 1 side).
      G12586369Courtesy of SUBARU OF AMERICA, INC.
    27. Install the injector driver with the three bolts.
      G12586370Courtesy of SUBARU OF AMERICA, INC.
    28. Connect the three connectors with lock and normal connector to the injector driver and move the lock lever as shown in the figure to lock the three connectors with lock.
      CAUTION: For connector with lock, connect the connector securely to lock it.
      G12586371Courtesy of SUBARU OF AMERICA, INC.
    29. Connect 2 connectors for the fuel injector and connect the clamp.
      G12586372Courtesy of SUBARU OF AMERICA, INC.
    30. Using 2 bolts, install the intake manifold protector (bank 2 side).
    31. Use the following procedures to install the SST.
      G12586373Courtesy of SUBARU OF AMERICA, INC.
      1. Remove 2 nuts on the engine mount.
      2. Using the SST, lift the engine ASSY.

        SST 99099AJ000, 18679AA020 

        G12586374Courtesy of SUBARU OF AMERICA, INC.
      3. Install the SST between engine mount and front crossmember.

        SST 18632AA020 

    32. Install 4 ignition coils and 4 spark plugs. (Refer to INSTALLATION )
    CAUTION: After the operation is completed, be sure to clear the DTC memory, and then check that no DTCs are detected. (Refer to MALFUNCTION ANALYSIS USING CHECK LIST FOR INTERVIEW )
    G12586375Courtesy of SUBARU OF AMERICA, INC.
  3. Spark plug inspection
    CAUTION:
    • Because the iridium plug is adopted, the gap adjustment is not required.
    • Do not scratch the iridium or platinum tip.
    • If heavily contaminated with sludge etc., replace the spark plug with a new one.
    • When replacing with a new spark plug, do not remove the cap for protecting the tip until the spark plug is installed to the engine.
    • If the spark plug is dropped accidentally, replace it with a new one.
    • Check the gap visually. Otherwise, the iridium tip may be damaged.
    • If damaged, replace the spark plug.
    G12586376Courtesy of SUBARU OF AMERICA, INC.
    NOTE: Plug type and gap
    Manufacturer Type Reference value [mm {in}] (plug gap [new]) Reference value [mm {in}] (maximum plug gap [used])
    DENSO ZXE27HBR8 0.7 to 0.8 {0.028 to 0.031} 1.0 {0.039}
    1. Visual inspection
      1. Start the engine.
      2. Race the engine 5 times by acceleration and deceleration at high engine speed (4000 r/min).
      3. Remove the spark plug.
      4. Check the electrode (iridium, platinum tip), threaded portion and insulator of the spark plug for damage.
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