Inspection Procedure

WARNING: This page is about a different car, the 2004 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

INSPECTION START
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, kinks and improper connections
  - Hoses and ducts for leaks
  - Air cleaner clogging
  - Gasket
  Fig 1: Checking Connectors & Hoses
  Courtesy of NISSAN MOTOR CO., U.S.A.
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.
  
  Fig 2: Engine Coolant Temperature Indicator Pointing To The Middle Of Gauge
  Courtesy of NISSAN MOTOR CO., U.S.A.
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.
  
  Fig 3: Running Engine At About 2000 RPM
  Courtesy of NISSAN MOTOR CO., U.S.A.
REPAIR OR REPLACE
Repair or replace components as necessary according to corresponding Diagnostic Procedure.
1. : GO TO 3.
CHECK TARGET IDLE SPEED
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.
  
  Fig 4: Revving Engine
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Read idle speed in "DATA MONITOR" mode with CONSULT-II.
  1. 650 +/- 50 RPM (in P or N position)
  Fig 5: CONSULT-II Display
  Courtesy of NISSAN MOTOR CO., U.S.A.
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 10.
2. NG: GO TO 4.
PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1. Stop engine.
2. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING .
  1. : GO TO 5.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform THROTTLE VALVE CLOSED POSITION LEARNING .
1. : GO TO 6.
PERFORM IDLE AIR VOLUME LEARNING
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.
CHECK TARGET IDLE SPEED AGAIN
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.
  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.
DETECT MALFUNCTIONING PART
Check the following.
- Check camshaft position sensor (PHASE) and circuit. Refer to DTC P0340 CAMSHAFT POSITION (CMP) SENSOR (PHASE) in ENGINE CONTROL SYSTEM - TITAN article in ENGINE PERFORMANCE.
- Check crankshaft position sensor (POS) and circuit. Refer to DTC P0335 CKP SENSOR (POS) in ENGINE CONTROL SYSTEM - TITAN article in ENGINE PERFORMANCE.
  OK or NG
1. OK: GO TO 9.
2. NG:
  1. Repair or replace.
  2. GO TO 4 .
CHECK ECM FUNCTION
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 NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to ECM RE-COMMUNICATING FUNCTION in POWER LOCKS, REMOTE KEYLESS ENTRY & ANTI-THEFT SYSTEMS - TITAN article in ACCESSORIES & BODY, CAB.
  1. : GO TO 4.
CHECK IGNITION TIMING
1. Run engine at idle.
2. Check ignition timing with a timing light.
  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 11.
  
  Fig 6: Checking Timing
  Courtesy of NISSAN MOTOR CO., U.S.A.
PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1. Stop engine.
2. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING .
  1. : GO TO 12.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform THROTTLE VALVE CLOSED POSITION LEARNING .
1. : GO TO 13.
PERFORM IDLE AIR VOLUME LEARNING
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.
CHECK TARGET IDLE SPEED AGAIN
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.
  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.
CHECK IGNITION TIMING AGAIN
1. Run engine at idle.
2. Check ignition timing with a timing light.
  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.
  
  Fig 7: Checking Timing
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK TIMING CHAIN INSTALLATION
Check timing chain installation. Refer to TIMING CHAIN in ENGINE MECHANICAL - TITAN - 5.6L article.

OK or NG
1. OK: GO TO 17.
2. NG:
  1. Repair the timing chain installation.
  2. GO TO 4 .
DETECT MALFUNCTIONING PART
Check the following.
- Check camshaft position sensor (PHASE) and circuit. Refer to DTC P0340 CAMSHAFT POSITION (CMP) SENSOR (PHASE) in ENGINE CONTROL SYSTEM - TITAN article in ENGINE PERFORMANCE.
- Check crankshaft position sensor (POS) and circuit. Refer to DTC P0335 CKP SENSOR (POS) in ENGINE CONTROL SYSTEM - TITAN article in ENGINE PERFORMANCE.
OK or NG
1. OK: GO TO 18.
2. NG:
  1. Repair or replace.
  2. GO TO 4 .
CHECK ECM FUNCTION
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 NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to ECM RE-COMMUNICATING FUNCTION in POWER LOCKS, REMOTE KEYLESS ENTRY & ANTI-THEFT SYSTEMS - TITAN article in ACCESSORIES & BODY, CAB.
  1. : GO TO 4.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION
With CONSULT-II
1. Turn ignition switch OFF and wait at a least 10 seconds.
2. Start engine and warm it up to normal operating temperature.
3. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in D position with "OD" OFF.
  NOTE: Keep the accelerator pedal as steady as possible during the cruising.
4. Set "OD" ON, then release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (30 MPH).
  NOTE: Never apply brake during releasing the accelerator pedal.
5. Repeat steps 3 to 4 five times.
6. Stop the vehicle and connect CONSULT-II to the vehicle.
7. Make sure that no (1st trip) DTC is displayed in "SELF-DIAG RESULTS" mode.
OK or NG
1. OK : INSPECTION END
2. NG: GO TO 21.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION
With GST
1. Turn ignition switch OFF and wait at a least 10 seconds.
2. Start engine and warm it up to normal operating temperature.
3. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in D position with "OD" OFF.
  NOTE: Keep the accelerator pedal as steady as possible during the cruising.
4. Set "OD" ON, then release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (30 MPH).
  NOTE: Never apply brake during releasing the accelerator pedal.
5. Repeat steps 3 to 4 five times.
6. Stop the vehicle and connect GST to the vehicle.
7. Make sure that no (1st trip) DTC is displayed.
OK or NG
1. OK : INSPECTION END
2. NG: GO TO 21.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 HARNESS
1. Turn ignition switch OFF and disconnect battery ground cable.
2. Disconnect ECM harness connector.
3. Disconnect A/F sensor 1 harness connector.
4. Check harness continuity between the following terminals.
  
  Fig 8: Checking Harness Continuity - Terminal Identification
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. Continuity should exist.
5. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 22.
2. NG
  1. Repair open circuit or short to ground or short to power in harness or connectors between ECM and A/F sensor 1.
  2. GO TO 4 .
PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1. Reconnect ECM harness connector.
2. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING .
  1. : GO TO 23.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform THROTTLE VALVE CLOSED POSITION LEARNING .
1. : GO TO 24.
PERFORM IDLE AIR VOLUME LEARNING
Refer to IDLE AIR VOLUME LEARNING .

Is Idle Air Volume Learning carried out successfully?

Yes or No
1. Yes (With CONSULT-II): GO TO 25.
2. Yes (Without CONSULT-II): GO TO 26.
3. No:
  1. Follow the instruction of Idle Air Volume Learning.
  2. GO TO 4 .
CHECK CO%
With CONSULT-II
1. Start engine and warm it up until engine coolant temperature indicator points 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.
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.
  
  Fig 9: CONSULT-II Display
  Courtesy of NISSAN MOTOR CO., U.S.A.
6. Check CO%.
  1. Idle CO: 3 - 11% and engine runs smoothly.
OK or NG
1. OK: GO TO 28.
2. NG: GO TO 27.
CHECK CO%
Without 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.
3. Disconnect engine coolant temperature sensor harness connector.
4. Connect a resistor (4.4 kohm) between terminals of engine coolant temperature sensor harness connector.
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.
  
  Fig 10: Connecting 4.4 K/Ohm Resistor
  Courtesy of NISSAN MOTOR CO., U.S.A.
6. Check CO%.
  1. Idle CO: 3 -- 11% 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 28.
2. NG: GO TO 27.
RECONNECT AIR FUEL RATIO (A/F) SENSOR 1 HARNESS CONNECTOR
1. Turn ignition switch OFF.
2. Reconnect A/F sensor 1 harness connector.
  1. : GO TO 31.
REPLACE AIR FUEL RATIO (A/F) SENSOR 1
1. Stop engine.
2. Replace A/F sensor 1 on the malfunctioning bank.
  1. With CONSULT-II: GO TO 29.
  2. Without CONSULT-II: GO TO 30.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION
With CONSULT-II
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Start engine and warm it up to normal operating temperature.
3. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in D position with "OD" OFF.
  NOTE: Keep the accelerator pedal as steady as possible during the cruising.
4. Set "OD" ON, then release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (30 MPH).
  NOTE: Never apply brake during releasing the accelerator pedal.
5. Repeat steps 3 to 4 five times.
6. Stop the vehicle and connect CONSULT-II to the vehicle.
7. Make sure that no (1st trip) DTC is displayed in "SELF-DIAG RESULTS" mode.
OK or NG
1. OK: GO TO 4 .
2. NG: GO TO 31.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION
With GST
1. Turn ignition switch OFF and wait at a least 10 seconds.
2. Start engine and warm it up to normal operating temperature.
3. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in D position with "OD" OFF.
  NOTE: Keep the accelerator pedal as steady as possible during the cruising.
4. Set "OD" ON, then release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (30 MPH).
  NOTE: Never apply brake during releasing the accelerator pedal.
5. Repeat steps 3 to 4 five times.
6. Stop the vehicle and connect GST to the vehicle.
7. Make sure that no (1st trip) DTC is displayed.
OK or NG
1. OK: GO TO 4 .
2. NG: GO TO 31.
DETECT MALFUNCTIONING PART
Check the following.
- Check fuel pressure regulator, and repair or replace if necessary. Refer to FUEL PRESSURE CHECK .
- Check mass air flow sensor and its circuit, and repair or replace if necessary. Refer to DTC P0101 MAF SENSOR and DTC P0102, P0103 MAF SENSOR in ENGINE CONTROL SYSTEM - TITAN article in ENGINE PERFORMANCE.
- Check injector and its circuit, and repair or replace if necessary. Refer to INJECTOR in SYSTEM & COMPONENT TESTING - TITAN article in ENGINE PERFORMANCE. .
- Check engine coolant temperature sensor and its circuit, and repair or replace if necessary. Refer to DTC P0117, P0118 ECT SENSOR and DTC P0125 ECT SENSOR in ENGINE CONTROL SYSTEM - TITAN article in ENGINE PERFORMANCE.
OK or NG
1. OK: GO TO 33.
2. NG:
  1. Repair or replace Malfunctioning Part.
  2. GO TO 32.
ERASE UNNECESSARY DTC
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 in ENGINE CONTROL SYSTEM - TITAN article in ENGINE PERFORMANCE.
1. : GO TO 4.
CHECK ECM FUNCTION
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 NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to ECM RE-COMMUNICATING FUNCTION in Power Locks, Remote Keyless Entry & Anti-Theft Systems - Titan article in ACCESSORIES & BODY, CAB.
  1. : GO TO 4.