Ignition Coil With Power Transistor

1. Turn ignition switch OFF.
2. Disconnect ignition coil harness connector.
3. Check resistance between ignition coil terminals as follows.
   TERMINAL RESISTANCE REFERENCE
   
   

   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

   Courtesy 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 located in fuse box to release fuel pressure.
   NOTE: Do not use CONSULT-II to release fuel pressure, or fuel pressure applies again during the following procedure.
   Fig 2: Identifying Fuel Pump Fuse (15A) And Fuse Block (J/B)

   Courtesy of NISSAN MOTOR CO., U.S.A.
8. Start engine.
9. After engine stalls, crank it 2 or 3 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.
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 illustration.
    Fig 3: Identifying Spark Plug And Grounded Metal Portion

    Courtesy of NISSAN MOTOR CO., U.S.A.
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:

    • Do not 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 17 mm or more is taken.
    NOTE: When the gap is 13 mm or less, the spark might be generated even if the coil is malfunctioning.
17. If NG, Replace ignition coil with power transistor.

CONDENSER 

1. Turn ignition switch OFF.
2. Disconnect condenser harness connector.
3. Check resistance between condenser terminals as 1 and 2.

Resistance: Above 1 MΩ [at 25°C (77°F)] 

Fig 4: Checking Resistance Between Condenser Terminals 1 And 2

Courtesy of NISSAN MOTOR CO., U.S.A.