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Home >> Nissan-Datsun >> 2011 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing (Qr25DE) >> 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 follows.
    TERMINAL RESISTANCE REFERENCE CHART

    Terminal No. (Polarity) Resistance Ω [at 25°C (77°F)]
    1 and 2 Except 0 or ∞
    1 and 3 Except 0
    2 and 3
    Fig 1: Checking Resistance Between Ignition Coil Terminals
    G07144502Courtesy of NISSAN MOTOR CO., U.S.A.
  4. If NG, replace ignition coil with power transistor. Refer to "REMOVAL AND INSTALLATION ".

    If OK, GO TO next step.

  5. Turn ignition switch OFF.
  6. Reconnect all harness connectors disconnected.
  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.
    • : Vehicle front
    Fig 2: Identifying IPDM E/R And Fuel Pump Fuse
    G07144503Courtesy of NISSAN MOTOR CO., U.S.A.
  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.
  12. Remove ignition coil and spark plug of the cylinder to be checked. Refer to "REMOVAL AND INSTALLATION ".
  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 (0.52 - 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: Checking Spark Between Spark Plug And Grounded Metal Portion
    G07144504Courtesy of NISSAN MOTOR CO., U.S.A.
    CAUTION:
    • During the operation, always stay 0.5 m (19.7 in) or more away from the spark plug and the ignition coil. Be careful not to get an electrical shock while checking, because the electrical discharge voltage becomes 20 kV or more.
    • It might cause to 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 the spark might be generated even if the coil is malfunctioning.
  17. If NG, replace ignition coil with power transistor. Refer to "REMOVAL AND INSTALLATION ".
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