Basic Inspection

1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for scheduled maintenance.
2. Open engine hood and check the following:
   • Harness connectors for improper connections
   • Wiring harness for improper connections, pinches and cuts.
   • Vacuum hoses for splits, kinks and improper connections
   • Hoses and ducts for leaks
   • Air cleaner clogging
   • Gasket
3. Confirm that electrical or mechanical loads are not applied.
   • Headlamp switch is OFF.
   • Air conditioner switch is OFF.
   • Rear window defogger switch is OFF.
   • Steering wheel is in the straight-ahead position, etc.
4. Start engine and warm it up until engine coolant temperature indicator points the middle of gauge. See Figure.

   Ensure engine stays below 1,000 RPM.

5. Run engine at about 2,000 RPM for about 2 minutes under noload. See Figure.
6. Make sure that no DTC is displayed with CONSULT-II or GST.

OK or NG

1. OK: Go to  3.
2. NG: Go to 2.

Repair or replace components as necessary according to corresponding diagnostic procedure.

1. Go to 3.

With CONSULT-II 

1. Run engine at about 2,000 RPM for about 2 minutes under no-load.
2. Rev engine (2,000 to 3,000 RPM) two or three times under noload, then run engine at idle speed for about 1 minute. See Figure.
3. Read idle speed in DATA MONITOR mode with CONSULT-II. See Figure.

   650 +/- 50 RPM (in P or N position) 

Without CONSULT-II 

1. Run engine at about 2,000 RPM for about 2 minutes under no-load.
2. Rev engine (2,000 to 3,000 RPM) two or three times under no-load, then run engine at idle speed for about 1 minute.
3. Check idle speed.

   650+/-50 RPM (in P or N position) 

OK or NG

1. OK: Go to  9.
2. NG: Go to 4.

1. Stop engine.
2. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING .
   1. Go to 5.

Perform THROTTLE VALVE CLOSED POSITION LEARNING .

1. Go to 6.

Refer to IDLE AIR VOLUME LEARNING .

Is idle air volume learning carried out successfully? 

Yes or No

1. Yes: Go to 7.
2. No: 1. Follow the instruction of IDLE AIR VOLUME LEARNING .

   2. Go to  4.

With CONSULT-II 

1. Start engine and warm it up to normal operating temperature.
2. Read idle speed in DATA MONITOR mode with CONSULT-II. See Figure.

   650+/-50 RPM (in P or N position) 

Without CONSULT-II 

1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.

   650+/-50 RPM (in P or N position) 

OK or NG

1. OK: Go to  10.
2. NG: Go to 8.

Check the following.

• Check camshaft position sensor (PHASE) and circuit. Refer to DTC P0340, P0345 CMP Sensor (PHASE) .
• Check crankshaft position sensor (POS) and circuit. Refer to DTC P0335 CKP Sensor (POS) .

OK or NG

1. OK: Go to 9.
2. NG: 1. Repair or replace.

   2. Go to  4.

1. Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but this is a rare case.)
2. Perform initialization of IVIS (NATS) system and registration of IVIS (NATS) ignition key IDs. Refer to IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM --- NATS) .
   1. Go to  4.

1. Run engine at idle.
2. Check ignition timing with a timing light. See Figure.

   15+/-5° BTDC (in P or N position) 

OK or NG

1. OK: Inspection end 
2. NG: Go to 11.

1. Stop engine.
2. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING .
   1. Go to 12.

Perform THROTTLE VALVE CLOSED POSITION LEARNING .

1. Go to 13.

Refer to IDLE AIR VOLUME LEARNING .

Is idle air volume learning carried out successfully? 

Yes or No

1. Yes: Go to 14.
2. No: 1. Follow the instruction of IDLE AIR VOLUME LEARNING .

   2. Go to  4.

With CONSULT-II 

1. Start engine and warm it up to normal operating temperature.
2. Read idle speed in DATA MONITOR mode with CONSULT-II. See Figure.

   650+/-50 RPM (in P or N position) 

Without CONSULT-II 

1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.

   650+/-50 RPM (in P or N position) 

OK or NG

1. OK: Go to 15.
2. NG: Go to  17.

1. Run engine at idle.
2. Check ignition timing with a timing light. See Figure.

   15+/-5° BTDC (in P or N position) 

OK or NG

1. OK: Inspection end 
2. NG: Go to 16.

Check timing chain installation. Refer to TIMING CHAIN .

OK or NG

1. OK: Go to 17
2. NG: 1. Repair the timing chain installation.

   2. Go to  4.

Check the following.

• Check camshaft position sensor (PHASE) and circuit. Refer to DTC P0340, P0345 CMP SENSOR (PHASE) .
• Check crankshaft position sensor (POS) and circuit. Refer to DTC P0335 CKP Sensor (POS) .

OK or NG

1. OK: Go to 18.
2. NG: 1. Repair or replace.

   2. Go to  4.

1. Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but this is a rare case.)
2. Perform initialization of IVIS (NATS) system and registration of IVIS (NATS) ignition key IDs. Refer to IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM --- NATS) .
   1. Go to  4.