Inspection Procedure

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 cut
   • Vacuum hoses for splits, kinds 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.

   Ensure engine stays below 1,000 rpm.

5. Run engine at about 2,000 rpm for about 2 minutes under no-load.
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 .

   675+/-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.

   675+/-50 rpm (in P or N position) 

OK or NG 

1. OK: GO TO  10 .
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.

Perform 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.

   675+/-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.

   675+/-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 all IVIS (NATS) ignition key IDs. Refer to IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM - NATS), IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM - NATS)  .

1. : GO TO  4 .

1. Run engine at idle.
2. Check ignition timing with a timing light.
   Fig 1: Locating Timing Indicator And Timing Marks

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

   15  °+/-5  ° BTDC (in P or N position) 

OK or NG 

1. OK (With CONSULT-II): GO TO  19 .
2. OK (Without CONSULT-II): GO TO  20 .
3. 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.

Perform 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.

   675+/-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.

   675+/-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 Fig 1

   15°+/-5° BTDC (in P or N position) 

OK or NG 

1. OK (With CONSULT-II): GO TO  19 .
2. OK (Without CONSULT-II): GO TO  20 .
3. 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 all IVIS (NATS) ignition key IDs. Refer to IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM - NATS)  .

1. : GO TO 4.

With CONSULT-II 

1. Run engine at about 2,000 rpm for about 2 minutes under no-load.
2. See HO2S1 MNTR (B1) in DATA MONITOR mode.
Fig 2: Displaying CONSULT-II DATA MONITOR Screen
Courtesy of NISSAN MOTOR CO., U.S.A.
3. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that the monitor fluctuates between LEAN and RICH more than 5 times during 10 seconds.

   1 times: RICH --> LEAN --> RICH 

   2 times: RICH --> LEAN --> RICH --> LEAN --> RICH 

OK or NG 

1. OK: GO TO  21 .
2. NG (Monitor does not fluctuate.): GO TO  23 .
3. NG (Monitor fluctuates less than 5 times.): GO TO 30.

Without CONSULT-II 

1. Stop engine and set ECM to Self-diagnostic mode II (Heated oxygen sensor 1 monitor). Refer to HOW TO SWITCH DIAGNOSTIC TEST MODE, HOW TO SWITCH DIAGNOSTIC TEST MODE  .
2. Start engine and run it at about 2,000 rpm for about 2 minutes under no-load.
3. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that the MIL comes on more than 5 times during 10 seconds.

OK or NG 

1. OK: GO TO  22 .
2. NG (MIL does not come on): GO TO  23 .
3. NG (MIL comes on less than 5 times): GO TO 30.

With CONSULT-II

1. See HO2S1 MNTR (B2) in DATA MONITOR mode. See Fig 2 .
2. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that the monitor fluctuates between LEAN and RICH more than 5 times during 10 seconds.

   1 times: RICH --> LEAN --> RICH 

   2 times: RICH --> LEAN --> RICH --> LEAN --> RICH 

OK or NG 

1. OK: INSPECTION END 
2. NG (Monitor does not fluctuate.): GO TO  24 .
3. NG (Monitor fluctuates less than 5 times.): GO TO 31.

Without CONSULT-II 

1. Switch the monitored sensor from bank 1 to bank 2. Refer to HOW TO SET DIAGNOSTIC SWITCH MONITORED SENSOR FROM BANK 1 TO BANK 2 OR VICE VERSA  .
2. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that the MIL comes on more than 5 times during 10 seconds.

OK or NG 

1. OK: INSPECTION END 
2. NG (MIL does not come on): GO TO  24 .
3. NG (MIL comes on less than 5 times): GO TO 31.

1. Turn ignition switch OFF and disconnect battery ground cable.
2. Disconnect ECM harness connector.
3. Disconnect heated oxygen sensor 1 (bank 1) harness connector.
4. Check harness continuity between ECM terminal 91 and heated oxygen sensor 1 (bank 1) terminal 1. Refer to WIRING DIAGRAM 

   Continuity should exist. 

5. Also check harness for short to ground and short to power.

OK or NG 

1. OK: GO TO  25 .
2. NG:
   1. Repair or replace harness between ECM and heated oxygen sensor 1 (bank 1).
   2. GO TO  4 .

1. Turn ignition switch OFF and disconnect battery ground cable.
2. Disconnect ECM harness connector.
3. Disconnect heated oxygen sensor 1 (bank 2) harness connector.
4. Check harness continuity between ECM terminal 92 and heated oxygen sensor 1 (bank 2) terminal 1. Refer to Wiring Diagram  .

   Continuity should exist. 

5. Also check harness for short to ground and short to power.

OK or NG 

1. OK >. GO TO 25.
2. NG:
   1. Repair or replace harness between ECM and heated oxygen sensor 1 (bank 2).
   2. GO TO  4 .

1. Reconnect ECM harness connector.
2. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING  .

1. : GO TO 26.

Perform THROTTLE VALVE CLOSED POSITION LEARNING  .

1. : GO TO 27.

Perform IDLE AIR VOLUME LEARNING  .

Is Idle Air Volume Learning carried out successfully? 

Yes or No 

1. Yes (With CONSULT-II): GO TO 28.
2. Yes (Without CONSULT-II) GO TO 29.
3. No:
   1. Follow the instruction of Idle Air Volume Learning.
   2. GO TO  4 .

With CONSULT-II 

1. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
2. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
3. Select ENG COOLANT TEMP in ACTIVE TEST mode.
   Fig 3: Displaying CONSULT-II ACTIVE TEST Screen

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. Set ENG COOLANT TEMP to 5° C (41° F) by touching DWN and Qd.
5. Start engine and rev it (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed.
6. Check CO %.

   Idle CO: 0.7 - 9.9 % and engine runs smoothly. 

OK or NG 

1. OK GO TO  31 .
2. NG GO TO  30 .

Without CONSULT-II 

1. Start engine and warm it up until engine coolant temperature points to the middle of gauge.
2. Turn ignition switch OFF.
3. Disconnect engine coolant temperature sensor harness connector.
4. Connect a resistor (4.4 kohm) between terminals of engine coolant temperature sensor harness connector.
   Fig 4: Connecting Resistor To Engine Coolant Temperature Sensor Harness Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.
5. Start engine and rev it (2,000 to 3,000 rpm) two or three under no load, then run engine at idle speed.
6. Check CO %.

   Idle CO: 0.7 - 9.9 % and engine runs smoothly. 

7. After checking CO %, turn ignition switch OFF, disconnect the resistor from the terminals of engine coolant temperature sensor harness connector, and then connect engine coolant temperature sensor harness connector to engine coolant temperature sensor.

OK or NG 

1. OK: GO TO  31 .
2. NG: GO TO 30.

1. Turn ignition switch OFF.
2. Reconnect heated oxygen sensor 1 harness connector.

1. GO TO  34 .

1. Stop engine.
2. Replace heated oxygen sensor 1 on the malfunctioning bank.

1. With CONSULT-II: GO TO 32.
2. Without CONSULT-II: GO TO  33 .

With CONSULT-II 

1. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
2. See HO2S1 MNTR (B1)/(B2) in DATA MONITOR mode.
3. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that the monitor fluctuates between LEAN and RICH more than 5 times during 10 seconds.

   1 time: RICH -->LEAN --> RICH 

   2 times: RICH --> LEAN --> RICH -->LEAN --> RICH 

OK or NG 

1. OK: GO TO  4 .
2. NG: GO TO  34 .

Without CONSULT-II 

1. Set ECM to Self-diagnostic mode II (Heated oxygen sensor 1 monitor). Refer to HOW TO SWITCH DIAGNOSTIC TEST MODE  .
2. Switch the monitored sensor to the malfunctioning bank. Refer to HOW TO SET DIAGNOSTIC SWITCH MONITORED SENSOR FROM BANK 1 TO BANK 2 OR VICE VERSA  .
3. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that the MIL comes on more than 5 times during 10 seconds.

OK or NG 

1. OK GO TO  4 .
2. NG GO TO 34.

Check the following.

• Check mass air flow sensor and its circuit, and repair or replace if necessary. Refer to DTC P0102, P0103 MAF SENSOR  .
• Check injector and its circuit, and repair or replace if necessary. Refer to INJECTOR  .
• Check engine coolant temperature sensor and its circuit, and repair or replace if necessary. Refer to COMPONENT DESCRIPTION  .
• Check fuel pressure and repair or replace if necessary. Refer to FUEL PRESSURE RELEASE  .

OK or NG 

1. OK: GO TO  36 .
2. NG:
   1. Repair or replace.
   2. GO TO 35.

After this inspection, unnecessary DTC might be displayed.

Erase the stored memory in ECM and TCM. Refer to HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION  and HOW TO ERASE DTC .

1. : GO TO  4 .

1. Substitute another know-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 .