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Home › Nissan-Datsun › 2010 › Frontier XE, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Control System - Component Testing (Qr25DE) › Ignition Signal › Component Inspection › Ignition Coil With Power Transistor

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.
    RESISTANCE SPECIFICATION

    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
    G04875504Courtesy 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.
  6. Reconnect all harness connectors disconnected.
  7. Remove fuel pump fuse in IPDM E/R 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 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.
    Fig 2: Identifying Fuel Pump Fuse
    G04894170Courtesy of NISSAN MOTOR CO., U.S.A.
  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 about three seconds, and check whether spark is generated between the spark plug and the grounded part.

    Spark should be generated. 

    CAUTION:
    • Never 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 more than 17 mm is taken.
    NOTE: When the gap is less than 13 mm, the spark might be generated even if the coil is malfunctioning.
  17. If NG, Replace ignition coil with power transistor.
Fig 3: Checking Spark Generation Between Spark Plug And Grounded Metal Portion
G04875164Courtesy of NISSAN MOTOR CO., U.S.A.
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