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Home >> Infiniti >> 2023 >> QX80 Premium Select, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (Diagnostics) (1 Of 2) >> Component Parts /Circuit Diagnosis >> Ignition Coil With Power Transistor >> Component Inspection
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Component Inspection

  1. CHECK IGNITION COIL WITH POWER TRANSISTOR-I 
    1. Turn ignition switch OFF.
    2. Disconnect ignition coil harness connector.
    3. Check resistance between ignition coil terminals as per the following.

      Terminals

      Resistance [at 25 deg.C (77 deg.F)]

      1 and 2

      Except 0 or INF.Ohm

      1 and 3

      Except 0 Ohm

      2 and 3

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Replace malfunctioning ignition coil with power transistor.

  2. CHECK IGNITION COIL WITH POWER TRANSISTOR-II 
    CAUTION: Perform the following procedure in a place with no combustible objects and good ventilation.
    1. Turn ignition switch OFF.
    2. Reconnect all harness connectors disconnected.
    3. Remove fuel pump fuse in IPDM E/R to release fuel pressure.
      NOTE:
      • For the fuse number, refer to Wiring Diagram .
      • For the fuse arrangement, refer to Wiring Diagram .
      • Do not use CONSULT to release fuel pressure, or fuel pressure applies again during the following procedure.
    4. Start engine.
    5. After engine stalls, crank it 2 or 3 times to release all fuel pressure.
    6. Turn ignition switch OFF.
    7. Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.
    8. Remove ignition coil and spark plug of the cylinder to be checked.
    9. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
    10. Connect spark plug and harness connector to ignition coil.
    11. Fix ignition coil using a rope etc. with gap of 13 - 17 mm (0.52 - 0.66 in) between the edge of the spark plug and grounded metal portion as shown in the figure.
      GNSDB3898Courtesy of NISSAN NORTH AMERICA, INC.
    12. Crank engine for approximately 3 seconds, and check whether spark is generated between the spark plug and the grounded metal portion.

      Spark should be generated.
      CAUTION:
      • Never place the spark plug and the ignition coil within 50 cm (19.7 in) each other. Be careful not to get an electrical shock while checking, because the electrical discharge voltage becomes 20 kV or more.
      • It might damage the ignition coil if the gap of more than 17 mm (0.66 in) is made.
      NOTE: When the gap is less than 13 mm (0.52 in), a spark might be generated even if the coil is malfunctioning.

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Replace malfunctioning ignition coil with power transistor.

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