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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 891 (Engine Control System (Diagnostic Codes & Symptom Tests)) >> DTC/Circuit Diagnosis >> Ignition Signal >> Component Inspection >> Ignition Coil With Power Transistor

Ignition Coil With Power Transistor

WARNING: This page is about a different car, the 2013 Nissan Armada. 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 IGNITION COIL . 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
    G08690840Courtesy of NISSAN NORTH AMERICA, INC.
  7. Remove fuel pump fuse 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 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.
    Fig 2: Identifying Fuel Pump Fuse And IPDM E/R
    G08690841Courtesy of NISSAN NORTH AMERICA, INC.
  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 - 0.66 in) between the edge of the spark plug and grounded metal portion as shown in the figure below.
  16. Crank engine for about 3 seconds, and check whether spark is generated between the spark plug and the grounded metal portion.

    Spark should be generated  .

    CAUTION:
    • During the operation, always stay 0.5 m (1.6 ft) 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 taken.
      Fig 3: Measuring Gap Between Spark Plug And Grounded Metal Portion Using Rope
      G08690842Courtesy 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 IGNITION COIL .
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