Engine Controls - Tests W/o Codes 3.0: Other Nissan Maxima A32

BACKFIRE

1. Check ignition timing and ignition circuit.
2. Check Exhaust Gas Recirculation (EGR) system.
3. Check Camshaft Position (CMP) sensor circuit
4. Check fuel pressure.
5. Check fuel evaporative emission circuit.
6. Check Positive Crankcase Ventilation (PCV) system.
7. Check Idle Air Control (IAC) Valve
8. Check front Heated Oxygen Sensor (HO2S) circuit.
9. Check main power supply and ground circuits.
10. Check engine mechanical condition.

ENGINE STALLS

1. Check idle speed adjustment.
2. Check Idle Air Control (IAC) Valve
3. Check Throttle Position (TP) sensor adjustment and circuit.
4. Check fuel injectors.
5. Check fuel pressure.
6. Check fuel pressure regulator.
7. Check ignition spark and spark plugs.
8. Check timing belt (if equipped).
9. Check for intake air leaks.
10. Check Positive Crankcase Ventilation (PCV) system.
11. Check Exhaust Gas Recirculation (EGR) system.
12. Check Mass Airflow (MAF) sensor circuit.
13. Check front Heated Oxygen Sensor (HO2S) circuit.
14. Check vehicle speed sensor circuit.
15. Check power steering oil pressure switch circuit.
16. Check engine mechanical condition.
17. Check main power supply and ground circuits.

ENGINE STALLS UNDER ACCELERATION/DECELERATION

1. Check fuel pressure.
2. Check fuel injectors.
3. Check idle adjustment screw passage for clogging (under deceleration).
4. Check Idle Air Control (IAC) Valve
5. Check for intake air leaks.
6. Check Exhaust Gas Recirculation (EGR) system.
7. Check ignition spark and spark plugs.
8. Check main power supply and ground circuits.

ENGINE STALLS UNDER HEAVY ELECTRICAL LOAD

1. Check fuel pressure.
2. Check fuel injectors.
3. Check battery and generator.
4. Check ignition spark and spark plugs.
5. Check main power supply and ground circuits.

ENGINE RUN-ON (DIESELING)

1. Check ignition timing.
2. Check idle speed adjustment.
3. Check Idle Air Control (IAC) Valve
4. Check fuel injectors.
5. Check fuel pressure regulator.
6. Check Exhaust Gas Recirculation (EGR) system.
7. Check Engine Coolant Temperature (ECT) sensor.

EXCESSIVE FUEL CONSUMPTION

1. Check ignition timing and ignition circuit.
2. Ensure cooling system is reaching normal operating temperature.
3. Check Engine Coolant Temperature (ECT) sensor.
4. Check Idle Air Control (IAC) Valve
5. Check fuel injectors.
6. Check fuel evaporative emission circuit.
7. Check Exhaust Gas Recirculation (EGR) system.
8. Check front Heated Oxygen Sensor (HO2S).
9. Check Throttle Position (TP) sensor adjustment and circuit.
10. Check main power supply and ground circuits.
11. Check engine mechanical condition.

HARD START/WILL NOT START

1. Check battery and starter.
2. Check fuel pressure.
3. Check fuel pump circuit.
4. Check fuel pressure regulator.
5. Check fuel injector circuit.
6. Check fuel evaporative emission circuit.
7. Check fast idle cam (Pickup 2.4L engine).
8. Check Idle Air Control (IAC) Valve
9. Check ignition timing and ignition circuit.
10. Check timing belt (if equipped).
11. Check Exhaust Gas Recirculation (EGR) valve.
12. Check Positive Crankcase Ventilation (PCV) system.
13. Check Camshaft Position (CMP) sensor circuit.
14. Check Crankshaft Position (CKP) sensor
15. Check Mass Airflow (MAF) sensor circuit.
16. Check Engine Coolant Temperature (ECT) sensor circuit.
17. Check main power supply and ground circuits.

HESITATION, FLAT SPOT OR SURGE

1. Check fuel pressure.
2. Check fuel delivery.
3. Check fuel evaporative emission circuit.
4. Check for intake air leaks.
5. Check Positive Crankcase Ventilation (PCV) system.
6. Check ignition timing and ignition circuit.
7. Check Exhaust Gas Recirculation (EGR) system.
8. Check idle speed adjustment.
9. Check Idle Air Control (IAC) Valve
10. Check Mass Airflow (MAF) sensor circuit.
11. Check front Heated Oxygen Sensor (HO2S) circuit.
12. Check Throttle Position (TP) sensor adjustment and circuit.
13. Check Engine Coolant Temperature (ECT) sensor circuit.
14. Check Knock Sensor (KS) circuit.
15. Check Park/Neutral position (inhibitor) switch circuit.
16. Check main power supply and ground circuits.
17. Check engine mechanical condition.

HIGH IDLE (NO RETURN TO IDLE)

1. Check idle speed adjustment.
2. Check Idle Air Control (IAC) Valve
3. Check throttle linkage.
4. Check for intake air leaks.
5. Check Positive Crankcase Ventilation (PCV) system.
6. Check Exhaust Gas Recirculation (EGR) system.
7. Check Throttle Position (TP) sensor adjustment and circuit.
8. Check fuel pressure.
9. Check fuel evaporative emission circuit.
10. Check A/C circuit.
11. Check Engine Coolant Temperature (ECT) sensor circuit.

HUNTING

1. Check Heated Oxygen Sensor (HO2S) circuit.
2. Check for intake air leaks.
3. Check Positive Crankcase Ventilation (PCV) system.
4. Check Idle Air Control (IAC) Valve
5. Check Throttle Position (TP) sensor adjustment.
6. Check Exhaust Gas Recirculation (EGR) valve.

LACK OF POWER

1. Check ignition timing and ignition circuit
2. Check timing belt (if equipped).
3. Check fuel pressure.
4. Check fuel delivery.
5. Check for intake air leaks.
6. Check Exhaust Gas Recirculation (EGR) system.
7. Check Camshaft Position (CMP) sensor circuit.
8. Check Mass Airflow (MAF) sensor circuit.
9. Check front Heated Oxygen Sensor (HO2S) circuit.
10. Check Throttle Position (TP) sensor adjustment and circuit.
11. Check Engine Coolant Temperature (ECT) sensor circuit.
12. Check vehicle speed sensor circuit.
13. Check Knock Sensor (KS) circuit.
14. Check main power supply and ground circuits.
15. Check A/C circuit.
16. Check engine mechanical condition.

ROUGH IDLE

1. Check for intake air leaks.
2. Check idle speed adjustment.
3. Check Positive Crankcase Ventilation (PCV) system.
4. Check Exhaust Gas Recirculation (EGR) system.
5. Check Idle Air Control (IAC) Valve
6. Check fuel injector circuit.
7. Check fuel delivery.
8. Check fuel evaporative emission circuit.
9. Check ignition timing and ignition circuit.
10. Check Camshaft Position (CMP) sensor circuit.
11. Check Mass Airflow (MAF) sensor circuit.
12. Check front Heated Oxygen Sensor (HO2S) circuit.
13. Check Throttle Position (TP) sensor adjustment and circuit.
14. Check main power supply and ground circuits.
15. Check engine mechanical condition.

SPARK KNOCK (PINGING)

1. Check ignition timing.
2. Check for intake air leaks.
3. Check Exhaust Gas Recirculation (EGR) valve.
4. Check Positive Crankcase Ventilation (PCV) system.
5. Check vacuum hose routing.
6. Check Knock Sensor (KS) circuit.
7. Check Engine Coolant Temperature (ECT) sensor circuit.
8. Check radiator (cooling fan) circuit.
9. Check main power supply and ground circuits.
10. Check engine mechanical condition.

SURGE

1. Check fuel pressure.
2. Check distributor and internal circuitry.
3. Check Exhaust Gas Recirculation (EGR) valve.
4. Check Heated Oxygen Sensor (HO2S).
5. Check Mass Airflow (MAF) sensor.

UNSTABLE IDLE

1. Check for intake air leaks.
2. Check Positive Crankcase Ventilation (PCV) system.
3. Check Exhaust Gas Recirculation (EGR) system.
4. Check idle speed adjustment.
5. Check idle adjustment screw passage for clogging.
6. Check Idle Air Control (IAC) Valve
7. Check fuel pressure.
8. Check fuel injectors.
9. Check ignition spark and spark plugs.
10. Check Heated Oxygen Sensor (HO2S).
11. Check engine mechanical condition.