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Home >> Infiniti >> 2005 >> FX45 >> Repair and Diagnosis >> Engine Performance >> Engine Control System - VK45DE >> Ignition Signal >> Component Inspection >> Ignition Coil With Power Transistor
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Ignition Coil With Power Transistor

CAUTION: Do the following procedure in the place where ventilation is good without the combustible.
  1. Turn ignition switch OFF.
  2. Disconnect ignition coil harness connector.
  3. Check resistance between ignition coil terminals as follows.
    Fig 1: Resistance Specifications
    G02358875Courtesy of NISSAN MOTOR CO., U.S.A.
  4. If NG, replace ignition coil with power transistor. If OK, go to next step.
  5. Turn ignition switch OFF.
    Fig 2: Checking Resistance Between Ignition Coil Terminals
    G02358876Courtesy of NISSAN MOTOR CO., U.S.A.
  6. Reconnect all harness connectors disconnected.
  7. Remove fuel pump fuse in IPDM E/R to release fuel pressure.
    NOTE: Do not use CONSULT-II 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 3: Identifying Fuel Pump Hose Location
    G02358877Courtesy of NISSAN MOTOR CO., U.S.A.
  12. Remove ignition coil and spark plug of the cylinder to be checked.
  13. Crank engine for five 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 about three seconds, and check whether spark is generated between the spark plug and the grounded metal portion.
    1. Spark should be generated. 
    Fig 4: Checking Spark Ignition
    G02358878Courtesy of NISSAN MOTOR CO., U.S.A.
    CAUTION:
    • Do not approach to the spark plug and the ignition coil within 50cm. Be careful not to get an electrical shock while checking, because the electrical discharge voltage becomes 20kV or more.
    • It might cause to damage the ignition coil if the gap of 17 mm or more is taken.
    NOTE: When the gap is 13 mm or less, the spark might be generated even if the coil is malfunctioning.
  17. If NG, replace ignition coil with power transistor.
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