 1.CHECK FOR INTAKE AIR LEAK AND PCV HOSE
- Start engine and run it at idle speed.
- Listen for the sound of the intake air leak.
- Check PCV hose connection.
Is intake air leak detected?
YES >>Discover air leak location and repair. NO >>GO TO 2.
 2.CHECK FOR EXHAUST SYSTEM CLOGGING
Stop engine and visually check exhaust tube, three way catalyst and muffler for dents. Is the inspection result normal? YES-1 >>With CONSULT-III: GO TO 3. YES-2 >>Without CONSULT-III: GO TO 4. NO >>Repair or replace malfunctioning part.
 3.PERFORM POWER BALANCE TEST
With CONSULT-III
- Start engine.
- Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.
- Check that each circuit produces a momentary engine speed drop.
Is the inspection result normal?
YES >>GO TO 9. NO >>GO TO 4.
 4.CHECK FUNCTION OF FUEL INJECTOR-I
 5.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 ■ - Never 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 cause 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 9. NO >>GO TO 6.
 6.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 7. NO >>Check ignition coil, power transistor and their circuits. Refer to Diagnosis Procedure (GT-R certified NISSAN dealer).
 7.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 (GT-R certified NISSAN dealer). NO >>Repair or clean spark plug. Then GO TO 8.
 8.CHECK FUNCTION OF IGNITION COIL-III
- Reconnect the initial spark plugs.
- Crank engine for about 3 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 (GT-R certified NISSAN dealer).
 9.CHECK COMPRESSION PRESSURE
 10.CHECK FUEL PRESSURE
 11.DETECT MALFUNCTIONING PART
Check fuel hoses and fuel tubes for clogging. Is the inspection result normal? YES >>Replace “fuel filter and fuel pump assembly”. NO >>Repair or replace malfunctioning part.
 12.CHECK IDLE SPEED AND IGNITION TIMING
 13.CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT
- Turn ignition switch OFF.
- Disconnect corresponding A/F sensor 1 harness connector.
- Disconnect ECM harness connector.
- Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
A/F sensor 1
| ECM
| Continuity
| Bank
| Connector
| Terminal
| Connector
| Terminal
| 1
| F8
| 1
| F102
| 81
| Existed
| 2
| 82
| 2
| F25
| 1
| 85
| 2
| 86
|
- Check the continuity between A/F sensor 1 harness connector or ECM harness connector and ground.
A/F sensor 1
| ECM
| Ground
| Continuity
| Bank
| Connector
| Terminal
| Connector
| Terminal
| 1
| F8
| 1
| F102
| 81
| Ground
| Not existed
| 2
| 82
| 2
| F25
| 1
| 85
| 2
| 86
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- Also check harness for short to power.
Is the inspection result normal?
YES >>GO TO 14. NO >>Repair open circuit, short to ground or short to power in harness or connectors.
 14.CHECK A/F SENSOR 1 HEATER
 15.CHECK MASS AIR FLOW SENSOR
 16.CHECK SYMPTOM MATRIX CHART
 17.ERASE THE 1ST TRIP DTC
 18.CHECK INTERMITTENT INCIDENT
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