 1.CHECK EXHAUST SYSTEM
Visually check exhaust tubes and muffler for dents. Is the inspection result normal? YES >>GO TO 2. NO >>Repair or replace malfunctioning part.
 2.CHECK EXHAUST GAS LEAK
- Start engine and run it at idle.
- Listen for an exhaust gas leak before the three way catalyst 1.

Is exhaust gas leak detected?
YES >>Repair or replace malfunctioning part. NO >>GO TO 3.
 3.CHECK INTAKE AIR LEAK
Listen for an intake air leak after the mass air flow sensor. Is intake air leak detected? YES >>Repair or replace malfunctioning part. NO >>GO TO 4.
 4.CHECK IDLE SPEED AND IGNITION TIMING
 5.CHECK FUEL INJECTORS
- Stop engine and then turn ignition switch ON.
- Check the voltage between ECM harness connector terminals as follows.
ECM
| Voltage
| +
| –
| Connector
| Terminal
| Connector
| Terminal
| F101
| 17
| M107
| 128
| Battery voltage
| 21
| 25
| 37
| 41
| 45
|
Is the inspection result normal?
YES >>GO TO 6. NO >>Perform Diagnosis Procedure (GT-R certified NISSAN dealer).
 6.CHECK FUNCTION OF IGNITION COIL-I
■ CAUTION ■
Perform the following procedure in a place with no combustible objects and good ventilation.
- Turn ignition switch OFF.
- Remove fuel pump fuse (1) in IPDM E/R (2) to release fuel pressure.

NOTE: Do not use CONSULT-III to release fuel pressure, or fuel pressure applies again during the following procedure.
- Start engine.
- After engine stalls, crank it two or three times to release all fuel pressure.
- Turn ignition switch OFF.
- Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.
- Remove ignition coil and spark plug of the cylinder to be checked.
- Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
- Connect spark plug and harness connector to ignition coil.
- 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.

- 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.
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■ CAUTION ■ - Do not place to the spark plug and the ignition coil within 0.5 m (1.6 ft) each other. Be careful not to get an electrical shock while checking, because the electrical discharge voltage becomes 20 kV or more.
- It might to damage the ignition coil if the gap of more than 17 mm (0.66 in) is made.
NOTE: When the gap is less than 13 mm (0.52 in), a spark might be generated even if the coil is malfunctioning.
Is the inspection result normal?
YES >>GO TO 10. NO >>GO TO 7.
 7.CHECK FUNCTION OF IGNITION COIL-II
- Turn ignition switch OFF.
- Disconnect spark plug and connect a non-malfunctioning spark plug.
- Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and the grounded metal portion.
Spark should be generated.
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Is the inspection result normal?
YES >>GO TO 8. NO >>Check ignition coil, power transistor and their circuits. Refer to Diagnosis Procedure (GT-R certified NISSAN dealer).
 8.CHECK SPARK PLUG
Check the initial spark plug for fouling, etc.  Is the inspection result normal? YES >>Replace spark plug(s) with standard type one(s). For spark plug type, refer to Spark Plug. NO >>Repair or clean spark plug. Then GO TO 9.
 9.CHECK FUNCTION OF IGNITION COIL-III
- Reconnect the initial spark plugs.
- Crank engine for about three seconds, and recheck whether spark is generated between the spark plug and the grounded portion.
Spark should be generated.
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Is the inspection result normal?
YES >>INSPECTION END NO >>Replace spark plug(s) with standard type one(s). For spark plug type, refer to Spark Plug.
 10.CHECK FUEL INJECTOR
- Turn ignition switch OFF.
- Remove fuel injector assembly.Refer to Removal and Installation (GT-R certified NISSAN dealer).Keep fuel hose and all fuel injectors connected to fuel tube.
- Disconnect all ignition coil harness connectors.
- Reconnect all fuel injector harness connectors disconnected.
- Turn ignition switch ON.
Does fuel drip from fuel injector?
YES >>Replace the fuel injector(s) from which fuel is dripping. NO >>GO TO 11.
 11.CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident. Is the trouble fixed? YES >>INSPECTION END NO >>Replace three way catalyst assembly.
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