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. See Figure .
   • 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.
   • Head lamp 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 no-load. 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 no load, then run engine at idle speed for about 1 minute.
3. Read idle speed in DATA MONITOR mode with CONSULT-II. See Figure .
   1. 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.
   1. 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 .

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 .
   1. 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.
   1. 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 CAMSHAFT POSITION (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 all 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 .
   1. 12 +/- 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 .
   1. 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.
   1. 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 .
   1. 12 +/- 5° BTDC (in P or N position) 

OK or NG

1. OK: Inspection end  .
2. NG: go to  4 .

Check timing chain installation. Refer to INSPECTION AFTER INSTALLATION .

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 CAMSHAFT POSITION (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 all IVIS (NATS) ignition key IDs. Refer to IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM - NATS)  .
   1. Go to  4 .