Engine Controls - Basic Diagnostic Procedures - Titan: Other Nissan Titan I

Idle Speed

With CONSULT-II

Check idle speed in "DATA MONITOR" mode with CONSULT-II.

Scheme 919

With GST

Check idle speed with GST.

Ignition Timing

Any of following two methods may be used.

Scheme 920

1. Attach timing light to loop wire as shown.
2. Check ignition timing.

Scheme 921

Scheme 922

Scheme 923

Scheme 924

1. Remove No. 1 ignition coil.
2. Connect No. 1 ignition coil and No. 1 spark plug with suitable high-tension wire as shown, and attach timing light clamp to this wire.
3. Check ignition timing.

Preparation

1. Make sure that the following parts are in good order. Battery Ignition system Engine oil and coolant levels Fuses ECM harness connector Vacuum hoses Air intake system (Oil filler cap, oil level gauge, etc.) Fuel pressure Engine compression Throttle valve Evaporative emission system
2. On air conditioner equipped models, checks should be carried out while the air conditioner is OFF.
3. On automatic transmission equipped models, when checking idle RPM, ignition timing and mixture ratio, checks should be carried out while shift lever is in N position.
4. When measuring CO percentage, insert probe more than 40 cm (15.7 in) into tail pipe.
5. Turn off headlamp, heater blower, rear window defogger.
6. Keep front wheels pointed straight ahead.

Scheme 925

Note. If a vehicle contains a part which is operating outside of design specifications with no MIL illumination, the part shall not be replaced prior to emission unless it is determined that the part has been tampered with or abused in such a way that the diagnostic system cannot reasonably be expected to detect the resulting malfunction

Scheme 926

Scheme 927

Scheme 928

Scheme 929

Scheme 930

Scheme 931

Scheme 932

Scheme 933

Scheme 934

Scheme 935

1. INSPECTION START Check service records for any recent repairs that may indicate a related malfunction, or a current need for scheduled maintenance. 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 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. Start engine and warm it up until engine coolant temperature indicator points the middle of gauge. Ensure engine stays below 1,000 RPM. Run engine at about 2,000 RPM for about 2 minutes under no load. Make sure that no DTC is displayed with CONSULT-II or GST. OK or NG OK: GO TO 3 . NG: GO TO 2.
2. REPAIR OR REPLACE Repair or replace components as necessary according to corresponding Diagnostic Procedure. : GO TO 3.
3. CHECK TARGET IDLE SPEED With CONSULT-II Run engine at about 2,000 RPM for about 2 minutes under no load. 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. Read idle speed in "DATA MONITOR" mode with CONSULT-II. 650 +/- 50 RPM (in P or N position) Without CONSULT-II Run engine at about 2,000 RPM for about 2 minutes under no load. 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. Check idle speed. 650 +/- 50 RPM (in P or N position) OK or NG OK: GO TO 10. NG: GO TO 4.
4. PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING Stop engine. Perform «ACCELERATOR PEDAL RELEASED POSITION LEARNING»(ref-169712-S24333390702004121500000) . : GO TO 5.
5. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING Perform «THROTTLE VALVE CLOSED POSITION LEARNING»(ref-169712-S39661707712004121500000) . : GO TO 6.
6. PERFORM IDLE AIR VOLUME LEARNING Perform «IDLE AIR VOLUME LEARNING»(ref-169712-S09460714722004121500000) . Is Idle Air Volume Learning carried out successfully? Yes or No Yes: GO TO 7. No: Follow the instruction of Idle Air Volume Learning. GO TO 4.
7. CHECK TARGET IDLE SPEED AGAIN With CONSULT-II Start engine and warm it up to normal operating temperature. Read idle speed in "DATA MONITOR" mode with CONSULT-II. 650 +/- 50 RPM (in P or N position) Without CONSULT-II Start engine and warm it up to normal operating temperature. Check idle speed. 650 +/- 50 RPM (in P or N position) OK or NG OK: GO TO 10. NG: GO TO 8.
8. DETECT MALFUNCTIONING PART Check the following. Check camshaft position sensor (PHASE) and circuit. Refer to «DTC P0340 CAMSHAFT POSITION (CMP) SENSOR (PHASE)»(ref-169472-S02224145662004120900000) in ENGINE CONTROL SYSTEM - TITAN article in ENGINE PERFORMANCE. Check crankshaft position sensor (POS) and circuit. Refer to «DTC P0335 CKP SENSOR (POS)»(ref-169472-S25509677022004120900000) in ENGINE CONTROL SYSTEM - TITAN article in ENGINE PERFORMANCE. OK or NG OK: GO TO 9. NG: Repair or replace. GO TO 4 .
9. CHECK ECM FUNCTION Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but this is a rare case.) Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to «ECM RE-COMMUNICATING FUNCTION»(ref-170166-S19595175762005010500000) in POWER LOCKS, REMOTE KEYLESS ENTRY & ANTI-THEFT SYSTEMS - TITAN article in ACCESSORIES & BODY, CAB. : GO TO 4.
10. CHECK IGNITION TIMING Run engine at idle. Check ignition timing with a timing light. 15 +/- 5° BTDC (in P or N position) OK or NG OK (With CONSULT-II): GO TO 19. OK (Without CONSULT-II): GO TO 20. NG: GO TO 11.
11. PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING Stop engine. Perform «ACCELERATOR PEDAL RELEASED POSITION LEARNING»(ref-169712-S24333390702004121500000) . : GO TO 12.
12. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING Perform «THROTTLE VALVE CLOSED POSITION LEARNING»(ref-169712-S39661707712004121500000) . : GO TO 13.
13. PERFORM IDLE AIR VOLUME LEARNING Perform «IDLE AIR VOLUME LEARNING»(ref-169712-S09460714722004121500000) . Is Idle Air Volume Learning carried out successfully? Yes or No Yes: GO TO 14. No: Follow the instruction of Idle Air Volume Learning. GO TO 4.
14. CHECK TARGET IDLE SPEED AGAIN With CONSULT-II Start engine and warm it up to normal operating temperature. Read idle speed in "DATA MONITOR" mode with CONSULT-II. 650 +/- 50 RPM (in P or N position) Without CONSULT-II Start engine and warm it up to normal operating temperature. Check idle speed. 650 +/- 50 RPM (in P or N position) OK or NG OK: GO TO 15. NG: GO TO 17.
15. CHECK IGNITION TIMING AGAIN Run engine at idle. Check ignition timing with a timing light. 15 +/- 5° BTDC (in P or N position) OK or NG OK (With CONSULT-II): GO TO 19. OK (Without CONSULT-II): GO TO 20. NG: GO TO 16.
16. CHECK TIMING CHAIN INSTALLATION Check timing chain installation. Refer to «TIMING CHAIN»(ref-163594-S02748399582004120700000) in ENGINE MECHANICAL - TITAN - 5.6L article. OK or NG OK: GO TO 17. NG: Repair the timing chain installation. GO TO 4 .
17. DETECT MALFUNCTIONING PART Check the following. Check camshaft position sensor (PHASE) and circuit. Refer to «DTC P0340 CAMSHAFT POSITION (CMP) SENSOR (PHASE)»(ref-169472-S02224145662004120900000) in ENGINE CONTROL SYSTEM - TITAN article in ENGINE PERFORMANCE. Check crankshaft position sensor (POS) and circuit. Refer to «DTC P0335 CKP SENSOR (POS)»(ref-169472-S25509677022004120900000) in ENGINE CONTROL SYSTEM - TITAN article in ENGINE PERFORMANCE. OK or NG OK: GO TO 18. NG: Repair or replace. GO TO 4 .
18. CHECK ECM FUNCTION Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but this is a rare case.) Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to «ECM RE-COMMUNICATING FUNCTION»(ref-170166-S19595175762005010500000) in POWER LOCKS, REMOTE KEYLESS ENTRY & ANTI-THEFT SYSTEMS - TITAN article in ACCESSORIES & BODY, CAB. : GO TO 4.
19. CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION With CONSULT-II Turn ignition switch OFF and wait at a least 10 seconds. Start engine and warm it up to normal operating temperature. 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. 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. Repeat steps 3 to 4 five times. Stop the vehicle and connect CONSULT-II to the vehicle. Make sure that no (1st trip) DTC is displayed in "SELF-DIAG RESULTS" mode. OK or NG OK : INSPECTION END NG: GO TO 21.
20. CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION With GST Turn ignition switch OFF and wait at a least 10 seconds. Start engine and warm it up to normal operating temperature. 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. 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. Repeat steps 3 to 4 five times. Stop the vehicle and connect GST to the vehicle. Make sure that no (1st trip) DTC is displayed. OK or NG OK : INSPECTION END NG: GO TO 21.
21. CHECK AIR FUEL RATIO (A/F) SENSOR 1 HARNESS Turn ignition switch OFF and disconnect battery ground cable. Disconnect ECM harness connector. Disconnect A/F sensor 1 harness connector. Check harness continuity between the following terminals. Continuity should exist. Also check harness for short to ground and short to power. OK or NG OK: GO TO 22. NG Repair open circuit or short to ground or short to power in harness or connectors between ECM and A/F sensor 1. GO TO 4 .
22. PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING Reconnect ECM harness connector. Perform «ACCELERATOR PEDAL RELEASED POSITION LEARNING»(ref-169712-S24333390702004121500000) . : GO TO 23.
23. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING Perform «THROTTLE VALVE CLOSED POSITION LEARNING»(ref-169712-S39661707712004121500000) . : GO TO 24.
24. PERFORM IDLE AIR VOLUME LEARNING Refer to «IDLE AIR VOLUME LEARNING»(ref-169712-S09460714722004121500000) . Is Idle Air Volume Learning carried out successfully? Yes or No Yes (With CONSULT-II): GO TO 25. Yes (Without CONSULT-II): GO TO 26. No: Follow the instruction of Idle Air Volume Learning. GO TO 4 .
25. CHECK CO% With CONSULT-II Start engine and warm it up until engine coolant temperature indicator points the middle of gauge. Turn ignition switch OFF, wait at least 10 seconds and then turn ON. Select "ENG COOLANT TEMP" in "ACTIVE TEST" mode. Set "ENG COOLANT TEMP" to 5°C (41°F) by touching "DWN" and "Qd". Start engine and rev it (2,000 to 3,000 RPM) two or three times under no load, then run engine at idle speed. Check CO%. Idle CO: 3 - 11% and engine runs smoothly. OK or NG OK: GO TO 28. NG: GO TO 27.
26. CHECK CO% Without CONSULT-II Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge. Turn ignition switch OFF. Disconnect engine coolant temperature sensor harness connector. Connect a resistor (4.4 kohm) between terminals of engine coolant temperature sensor harness connector. Start engine and rev it (2,000 to 3,000 RPM) two or three times under no load, then run engine at idle speed. Check CO%. Idle CO: 3 -- 11% and engine runs smoothly. 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 OK: GO TO 28. NG: GO TO 27.
27. RECONNECT AIR FUEL RATIO (A/F) SENSOR 1 HARNESS CONNECTOR Turn ignition switch OFF. Reconnect A/F sensor 1 harness connector. : GO TO 31.
28. REPLACE AIR FUEL RATIO (A/F) SENSOR 1 Stop engine. Replace A/F sensor 1 on the malfunctioning bank. With CONSULT-II: GO TO 29. Without CONSULT-II: GO TO 30.
29. CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION With CONSULT-II Turn ignition switch OFF and wait at least 10 seconds. Start engine and warm it up to normal operating temperature. 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. 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. Repeat steps 3 to 4 five times. Stop the vehicle and connect CONSULT-II to the vehicle. Make sure that no (1st trip) DTC is displayed in "SELF-DIAG RESULTS" mode. OK or NG OK: GO TO 4 . NG: GO TO 31.
30. CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION With GST Turn ignition switch OFF and wait at a least 10 seconds. Start engine and warm it up to normal operating temperature. 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. 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. Repeat steps 3 to 4 five times. Stop the vehicle and connect GST to the vehicle. Make sure that no (1st trip) DTC is displayed. OK or NG OK: GO TO 4 . NG: GO TO 31.
31. DETECT MALFUNCTIONING PART Check the following. Check fuel pressure regulator, and repair or replace if necessary. Refer to «FUEL PRESSURE CHECK»(ref-169712-S13591038672004121500000) . Check mass air flow sensor and its circuit, and repair or replace if necessary. Refer to «DTC P0101 MAF SENSOR»(ref-169472-S11251271602004120900000) and «DTC P0102, P0103 MAF SENSOR»(ref-169472-S34638908812004120900000) in ENGINE CONTROL SYSTEM - TITAN article in ENGINE PERFORMANCE. Check injector and its circuit, and repair or replace if necessary. Refer to «INJECTOR»(ref-169809-S14238346782004121600000) 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»(ref-169472-S20965694332004120900000) and «DTC P0125 ECT SENSOR»(ref-169472-S35315766732004120900000) in ENGINE CONTROL SYSTEM - TITAN article in ENGINE PERFORMANCE. OK or NG OK: GO TO 33. NG: Repair or replace Malfunctioning Part. GO TO 32.
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»(ref-169472-S16933045562004120900000) and «HOW TO ERASE DTC»(ref-169880-S23429394952004121700000) in ENGINE CONTROL SYSTEM - TITAN article in ENGINE PERFORMANCE. : GO TO 4.
33. CHECK ECM FUNCTION Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but this is a rare case.) Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to «ECM RE-COMMUNICATING FUNCTION»(ref-170166-S19595175762005010500000) in Power Locks, Remote Keyless Entry & Anti-Theft Systems - Titan article in ACCESSORIES & BODY, CAB. : GO TO 4.

Before performing Idle Air Volume Learning, make sure that all of the following conditions are satisfied. Learning will be cancelled if any of the following conditions are missed for even a moment.

1. Battery voltage: More than 12.9V (At idle)
2. Engine coolant temperature: 70 - 100°C (158 - 212°F)
3. PNP switch: ON
4. Electric load switch: OFF (Air conditioner, headlamp, rear window defogger) On vehicles equipped with daytime running light systems, if the parking brake is applied before the engine is started, the headlamp will not be illuminated.
5. Steering wheel: Neutral (Straight-ahead position)
6. Vehicle speed: Stopped
7. Transmission: Warmed-up For models with CONSULT-II, drive vehicle until "FLUID TEMP SE" in "DATA MONITOR" mode of "A/T" system indicates less than 0.9V. For models without CONSULT-II, drive vehicle for 10 minutes.

Fuel Pressure Release

With CONSULT-II

Scheme 936

1. Turn ignition switch ON.
2. Perform "FUEL PRESSURE RELEASE" in "WORK SUPPORT" mode with CONSULT-II.
3. Start engine.
4. After engine stalls, crank it two or three times to release all fuel pressure.
5. Turn ignition switch OFF.

Without CONSULT-II

Scheme 937

1. Remove fuel pump fuse located in IPDM E/R.
2. Start engine.
3. After engine stalls, crank it two or three times to release all fuel pressure.
4. Turn ignition switch OFF.
5. Reinstall fuel pump fuse after servicing fuel system.

Fuel Pressure Check

Scheme 938

Scheme 939

1. Release fuel pressure to zero. Refer to «FUEL PRESSURE RELEASE»(ref-169712-S33627982672004121500000) .
2. Remove engine cover.
3. Remove fuel hose using Quick Connector Release J-45488. Refer to «FUEL INJECTOR AND FUEL TUBE»(ref-163594-S08204080392004120700000) in ENGINE MECHANICAL - TITAN - 5.6L article. Do not twist or kink fuel hose because it is plastic hose. Do not remove fuel hose from quick connector. Keep fuel hose connections clean.
4. Install Fuel Pressure Adapter J-44321-6 and Fuel Pressure Gauge (from kit J-44321) as shown in figure. Do not distort or bend fuel rail tube when installing fuel pressure gauge adapter. When reconnecting fuel hose, check the original fuel hose for damage and abnormality.
5. Turn ignition switch ON (reactivate fuel pump), and check for fuel leakage.
6. Start engine and check for fuel leakage.
7. Read the indication of fuel pressure gauge. During fuel pressure check, check for fuel leakage from fuel connection every 3 minutes. At idling: Approximately 350 kPa (3.57 kg/cm 2 , 51 psi)
8. If result is unsatisfactory, go to next step.
9. Check the following. Fuel hoses and fuel tubes for clogging Fuel filter for clogging Fuel pump Fuel pressure regulator for clogging If OK, replace fuel pressure regulator. If NG, repair or replace.
10. Before disconnecting Fuel Pressure Gauge and Fuel Pressure Adapter J-44321-6, release fuel pressure to zero. Refer to «FUEL PRESSURE RELEASE»(ref-169712-S33627982672004121500000) .