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Home >> Infiniti >> 2010 >> M45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing >> Ignition Signal >> Component Inspection >> Ignition Coil With Power Transistor
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Ignition Coil With Power Transistor

CAUTION: Perform the following procedure in a place with no combustible objects and good ventilation.
  1. Turn ignition switch OFF.
  2. Disconnect ignition coil harness connector.
  3. Check resistance between ignition coil terminals as per the following.
    RESISTANCE REFERENCE CHART

    Terminal No. (Polarity) Resistance [at 25°C (77°F)]
    1 and 2 Except 0 or ∞ Ω
    1 and 3 Except 0 Ω
    2 and 3
  4. If NG, replace ignition coil with power transistor.

    If OK, go to next step.

  5. Turn ignition switch OFF.
  6. Reconnect all harness connectors disconnected.
    Fig 1: Checking Resistance Between Ignition Coil Terminals
    G04875504Courtesy of NISSAN MOTOR CO., U.S.A.
  7. Remove fuel pump fuse (1) in IPDM E/R (2) to release fuel pressure.
    NOTE: Do not use CONSULT-III to release fuel pressure, or fuel pressure applies again during the following procedure.
  8. Start engine.
  9. After engine stalls, crank it two or three times to release all fuel pressure.
  10. Turn ignition switch OFF.
  11. Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.
    Fig 2: Identifying Fuel Pump Fuse In IPDM E/R
    G05209458Courtesy of NISSAN MOTOR CO., U.S.A.
  12. Remove ignition coil and spark plug of the cylinder to be checked.
  13. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
  14. Connect spark plug and harness connector to ignition coil.
  15. Fix ignition coil using a rope etc. with gap of 13 - 17 mm between the edge of the spark plug and grounded metal portion as shown in the figure.
  16. 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  .

    Fig 3: Identifying Gap Between Edge Of Spark Plug And Grounded Metal Portion
    G04875164Courtesy of NISSAN MOTOR CO., U.S.A.
    CAUTION:
    • Never place the spark plug and the ignition coil within 50 cm 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 is made.
    NOTE: When the gap is less than 13 mm, spark might be generated even if the coil is malfunctioning.
  17. If NG, replace malfunctioning ignition coil with power transistor.
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