Nissan Sentra B18 (2020-2025) Service Manual: Ignition Coil with Power Transistor

Component Inspection

1. CHECK IGNITION COIL WITH POWER TRANSISTOR-1

   1. Turn ignition switch OFF.

   2. Disconnect ignition coil harness connector.

   3. Check resistance between ignition coil terminals as per the following.

      Ignition coil		Condition		Resistance
      +	−
      Terminal
      1	2	Temperature	25°C (77°F)	Except 0 or ∞Ω
      	3			Except 0 Ω
      2	3

   Is the inspection result normal?

   YES >>

   GO TO 2.

   NO >>

   Replace malfunctioning ignition coil with power transistor. Refer to Exploded View.

2. CHECK IGNITION COIL WITH POWER TRANSISTOR-2

   CAUTION:

   Perform the following procedure in a place with no combustible objects and good ventilation.

   1. Reconnect all harness connectors disconnected.

   2. 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.

   3. Start engine.

   4. After engine stalls, crank it 2 or 3 times to release all fuel pressure.

   5. Turn ignition switch OFF.

   6. Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.

   7. Remove ignition coil and spark plug of the cylinder to be checked. Refer to Exploded View.

   8. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.

   9. Connect spark plug and harness connector to ignition coil.

   10. 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.

       

   11. 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.

       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 taken.

       Note:

       When the gap is less than 13 mm (0.52 in), the spark might be generated even if the coil is malfunctioning.

   Is the inspection result normal?

   YES >>

   INSPECTION END

   NO >>

   Replace malfunctioning ignition coil with power transistor. Refer to Exploded View.

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