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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R Spec V >> Repair and Diagnosis >> External Pages >> Different car >> Section 2384 (Engine Control System - Component Testing (VQ40DE)) >> Ignition Signal >> Component Inspection >> Ignition Coil With Power Transistor
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Ignition Coil With Power Transistor

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
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.
    Terminal No. (Polarity) Resistance Ω [at 25°C (77°F)]
    1 and 2 Except 0 or ∞
    1 and 3 Except 0
    2 and 3
  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.
    Fig 1: Checking Resistance Between Ignition Coil Terminals 1, 2 And 3
    G08170808Courtesy of NISSAN NORTH AMERICA, INC.
  7. Remove fuel pump fuse (No. 48) in IPDM E/R to release fuel pressure.
    NOTE: Do not use CONSULT 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. Refer to "REMOVAL AND INSTALLATION ".
    Fig 2: Identifying Fuel Pump Fuse And IPDM E/R
    G08170809Courtesy of NISSAN NORTH AMERICA, INC.
  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 (0.52 - 0.66 in) 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 place to the spark plug and the ignition coil within 50cm (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 cause to damage the ignition coil if the gap of more than 17 mm (0.66 in) is made.
    Fig 3: Identifying Spark Length Between Spark Plug Edge And Grounded Metal Portion
    G08170810Courtesy of NISSAN NORTH AMERICA, INC.
    NOTE: When the gap is less than 13 mm (0.52 in), 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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