Home ReviewsRefund
Home/Nissan/Sentra/Nissan Sentra B14 (1994-1999)/Repair manual/Testing & Diagnostics/Engine Controls - Tests W/o Codes 1.6L: Other
Contents Wiring diagrams Section: Testing & Diagnostics All sections

Engine Controls - Tests W/o Codes 1.6L: Other Nissan Sentra B14

Testing & Diagnostics ~1412 words

AFTERFIRE (AFTERBURN)

  1. Check fuel pressure regulator.
  2. Check fuel injector circuit.
  3. Check fuel evaporative emission system.
  4. Check Positive Crankcase Ventilation (PCV) system.
  5. Check Idle Air Control (IAC) valve circuit.
  6. Check ignition timing and ignition circuit.
  7. Check EGR-Canister (EGRC) control solenoid and circuit.
  8. Check Camshaft Position (CP) sensor circuit.
  9. Check Mass Airflow (MAF) sensor circuit.
  10. Check front Oxygen Sensor (O2S) circuit.
  11. Check Throttle Position (TP) sensor adjustment and circuit.
  12. Check Engine Coolant Temperature (ECT) sensor.
  13. Check PCM inputs/outputs and PCM.

BACKFIRE

  1. Check engine mechanical condition.
  2. Check fuel pump circuit.
  3. Check fuel pressure regulator.
  4. Check fuel injector circuit.
  5. Check fuel evaporative emission circuit.
  6. Check Positive Crankcase Ventilation (PCV) system.
  7. Check Idle Air Control (IACV)-Air Regulator.
  8. Check Idle Air Control Valve-Auxiliary Air Control (IACV-AAC) valve circuit.
  9. Check Idle Air Control-Fast Idle Control Device (IAC-FICD) circuit.
  10. Check ignition timing and ignition circuit.
  11. Check EGR-Canister (EGRC) control solenoid and circuit.
  12. Check Exhaust Gas Recirculation (EGR) system.
  13. Check main power supply and ground circuits.
  14. Check Camshaft Position (CP) sensor circuit.
  15. Check Mass Airflow (MAF) sensor circuit.
  16. Check front Oxygen Sensor (O2S) circuit.
  17. Check Engine Coolant Temperature (ECT) sensor.
  18. Check PCM inputs/outputs and PCM.

ENGINE STALLS

  1. Check engine mechanical condition.
  2. Check fuel pump circuit.
  3. Check fuel pressure regulator.
  4. Check fuel injector circuit.
  5. Check fuel evaporative emission circuit.
  6. Check Positive Crankcase Ventilation (PCV) system.
  7. Check Idle Air Control Valve (IACV)-Air Regulator.
  8. Check idle speed adjustment.
  9. Check Idle Air Control Valve-Auxiliary Air Control (IACV-AAC) valve circuit.
  10. Check Idle Air Control-Fast Idle Control Device (IAC-FICD) circuit.
  11. Check ignition timing and ignition circuit.
  12. Check EGR-Canister (EGRC) control solenoid and circuit.
  13. Check Exhaust Gas Recirculation (EGR) system.
  14. Check main power supply and ground circuits.
  15. Check radiator (cooling fan) circuit.
  16. Check A/C circuit.
  17. Check Camshaft Position (CP) sensor circuit.
  18. Check Mass Airflow (MAF) sensor circuit.
  19. Check front Oxygen Sensor (O2S) circuit.
  20. Check Throttle Position (TP) sensor adjustment and circuit.
  21. Check vehicle speed sensor circuit.
  22. Check Engine Coolant Temperature (ECT) sensor.
  23. Check power steering oil pressure switch circuit.
  24. Check PCM inputs/outputs and PCM.

ENGINE RUN-ON (DIESELING)

  1. Check PCM inputs/outputs and PCM.

EXCESSIVE FUEL CONSUMPTION

  1. Check engine mechanical condition.
  2. Check fuel pump circuit.
  3. Check fuel pressure regulator.
  4. Check fuel injector circuit.
  5. Check fuel evaporative emission circuit.
  6. Check Positive Crankcase Ventilation (PCV) system.
  7. Check Idle Air Control (IACV)-Air Regulator.
  8. Check idle speed adjustment.
  9. Check Idle Air Control Valve-Auxiliary Air Control (IACV-AAC) valve circuit.
  10. Check Idle Air Control-Fast Idle Control Device (IAC-FICD) circuit.
  11. Check ignition timing and ignition circuit.
  12. Check EGR-Canister (EGRC) control solenoid and circuit.
  13. Check Exhaust Gas Recirculation (EGR) system.
  14. Check main power supply and ground circuits.
  15. Check Camshaft Position (CP) sensor circuit.
  16. Check Mass Airflow (MAF) sensor circuit.
  17. Check front Oxygen Sensor (O2S) circuit.
  18. Check Throttle Position (TP) sensor adjustment and circuit.
  19. Check Engine Coolant Temperature (ECT) sensor.
  20. Check vehicle speed sensor circuit.
  21. Check Park/Neutral position (inhibitor) switch circuit.
  22. Check PCM inputs/outputs and PCM.

HARD START/WILL NOT START (COLD)

  1. Check engine mechanical condition.
  2. Check fuel pump circuit.
  3. Check fuel pressure regulator.
  4. Check fuel injector circuit.
  5. Check fuel evaporative emission circuit.
  6. Check Positive Crankcase Ventilation (PCV) system.
  7. Check Idle Air Control (IACV)-Air Regulator.
  8. Check idle speed adjustment.
  9. Check Idle Air Control Valve-Auxiliary Air Control (IACV-AAC) valve circuit.
  10. Check Idle Air Control-Fast Idle Control Device (IAC-FICD) circuit.
  11. Check ignition timing and ignition circuit.
  12. Check Exhaust Gas Recirculation (EGR) system.
  13. Check main power supply and ground circuits.
  14. Check radiator (cooling fan) circuit.
  15. Check A/C circuit.
  16. Check Camshaft Position (CP) sensor circuit.
  17. Check Mass Airflow (MAF) sensor circuit.
  18. Check Engine Coolant Temperature (ECT) sensor circuit.
  19. Check start signal circuit.
  20. Check PCM inputs/outputs and PCM.

HARD START/NO RESTART (HOT)

  1. Check engine mechanical condition.
  2. Check fuel pump circuit.
  3. Check fuel pressure regulator.
  4. Check fuel injector circuit.
  5. Check fuel evaporative emission circuit.
  6. Check Positive Crankcase Ventilation (PCV) system.
  7. Check Idle Air Control (IACV)-Air Regulator.
  8. Check idle speed adjustment.
  9. Check Idle Air Control Valve-Auxiliary Air Control (IACV-AAC) valve circuit.
  10. Check Idle Air Control-Fast Idle Control Device (IAC-FICD) circuit.
  11. Check ignition timing and ignition circuit.
  12. Check Exhaust Gas Recirculation (EGR) system.
  13. Check main power supply and ground circuits.
  14. Check radiator (cooling fan) circuit.
  15. Check A/C circuit.
  16. Check Camshaft Position (CP) sensor circuit.
  17. Check Mass Airflow (MAF) sensor circuit.
  18. Check Engine Coolant Temperature (ECT) sensor circuit.
  19. Check start signal circuit.
  20. Check PCM inputs/outputs and PCM.

HESITATION, FLAT SPOT OR SURGE

  1. Check engine mechanical condition.
  2. Check fuel delivery.
  3. Check fuel pump circuit.
  4. Check fuel pressure regulator.
  5. Check fuel injector circuit.
  6. Check fuel evaporative emission circuit.
  7. Check Positive Crankcase Ventilation (PCV) system.
  8. Check Idle Air Control (IACV)-Air Regulator.
  9. Check idle speed adjustment.
  10. Check Idle Air Control Valve-Auxiliary Air Control (IACV-AAC) valve circuit.
  11. Check Idle Air Control-Fast Idle Control Device (IAC-FICD) circuit.
  12. Check ignition timing and ignition circuit.
  13. Check EGR-Canister (EGRC) control solenoid and circuit.
  14. Check Exhaust Gas Recirculation (EGR) system.
  15. Check main power supply and ground circuits.
  16. Check radiator (cooling fan) circuit.
  17. Check A/C circuit.
  18. Check Camshaft Position (CP) sensor circuit.
  19. Check Mass Airflow (MAF) sensor circuit.
  20. Check front Oxygen Sensor (O2S) circuit.
  21. Check Throttle Position (TP) sensor adjustment and circuit.
  22. Check Engine Coolant Temperature (ECT) sensor circuit.
  23. Check vehicle speed sensor circuit.
  24. Check Knock Sensor (KS) circuit.
  25. Check Park/Neutral position (inhibitor) switch circuit.
  26. Check PCM inputs/outputs and PCM.

HIGH IDLE (NO RETURN TO IDLE)

  1. Check fuel pressure regulator.
  2. Check fuel evaporative emission circuit.
  3. Check Positive Crankcase Ventilation (PCV) system.
  4. Check Idle Air Control (IACV)-Air Regulator.
  5. Check idle speed adjustment.
  6. Check Idle Air Control Valve-Auxiliary Air Control (IACV-AAC) valve circuit.
  7. Check Idle Air Control-Fast Idle Control Device (IAC-FICD) circuit.
  8. Check Exhaust Gas Recirculation (EGR) system.
  9. Check radiator (cooling fan) circuit.
  10. Check A/C circuit.
  11. Check Throttle Position (TP) sensor adjustment and circuit.
  12. Check Engine Coolant Temperature (ECT) sensor circuit.
  13. Check PCM inputs/outputs and PCM.

LACK OF POWER/POOR ACCELERATION (STUMBLE)

  1. Check engine mechanical condition.
  2. Check fuel delivery.
  3. Check fuel pump circuit.
  4. Check fuel pressure regulator.
  5. Check fuel injector circuit.
  6. Check fuel evaporative emission circuit.
  7. Check Positive Crankcase Ventilation (PCV) system.
  8. Check Idle Air Control (IACV)-Air Regulator.
  9. Check Idle Air Control Valve-Auxiliary Air Control (IACV-AAC) valve circuit.
  10. Check Idle Air Control-Fast Idle Control Device (IAC-FICD) circuit.
  11. Check ignition timing and ignition circuit.
  12. Check EGR-Canister (EGRC) control solenoid and circuit.
  13. Check Exhaust Gas Recirculation (EGR) system.
  14. Check main power supply and ground circuits.
  15. Check radiator (cooling fan) circuit.
  16. Check A/C circuit.
  17. Check Camshaft Position (CP) sensor circuit.
  18. Check Mass Airflow (MAF) sensor circuit.
  19. Check front Oxygen Sensor (O2S) circuit.
  20. Check Throttle Position (TP) sensor adjustment and circuit.
  21. Check Engine Coolant Temperature (ECT) sensor circuit.
  22. Check vehicle speed sensor circuit.
  23. Check Knock Sensor (KS) circuit.
  24. Check Park/Neutral position (inhibitor) switch circuit.
  25. Check PCM inputs/outputs and PCM.

ROUGH IDLE

  1. Check engine mechanical condition.
  2. Check fuel delivery.
  3. Check fuel pump circuit.
  4. Check fuel pressure regulator.
  5. Check fuel injector circuit.
  6. Check fuel evaporative emission circuit.
  7. Check Positive Crankcase Ventilation (PCV) system.
  8. Check Idle Air Control (IACV)-Air Regulator.
  9. Check idle speed adjustment.
  10. Check Idle Air Control Valve-Auxiliary Air Control (IACV-AAC) valve circuit.
  11. Check Idle Air Control-Fast Idle Control Device (IAC-FICD) circuit.
  12. Check ignition timing and ignition circuit.
  13. Check Exhaust Gas Recirculation (EGR) system.
  14. Check main power supply and ground circuits.
  15. Check radiator (cooling fan) circuit.
  16. Check A/C circuit.
  17. Check Camshaft Position (CP) sensor circuit.
  18. Check Mass Airflow (MAF) sensor circuit.
  19. Check front Oxygen Sensor (O2S) circuit.
  20. Check Throttle Position (TP) sensor adjustment and circuit.
  21. Check Engine Coolant Temperature (ECT) sensor circuit.
  22. Check start signal circuit.
  23. Check Knock Sensor (KS) circuit.
  24. Check Park/Neutral position (inhibitor) switch circuit.
  25. Check power steering oil pressure switch circuit.
  26. Check PCM inputs/outputs and PCM.

SPARK KNOCK (PINGING)

  1. Check engine mechanical condition.
  2. Check fuel pump circuit.
  3. Check fuel pressure regulator.
  4. Check fuel injector circuit.
  5. Check fuel evaporative emission circuit.
  6. Check Positive Crankcase Ventilation (PCV) system.
  7. Check Idle Air Control (IACV)-Air Regulator.
  8. Check Idle Air Control Valve-Auxiliary Air Control (IACV-AAC) valve circuit.
  9. Check Idle Air Control-Fast Idle Control Device (IAC-FICD) circuit.
  10. Check ignition timing and ignition circuit.
  11. Check EGR-Canister (EGRC) control solenoid and circuit.
  12. Check Exhaust Gas Recirculation (EGR) system.
  13. Check main power supply and ground circuits.
  14. Check radiator (cooling fan) circuit.
  15. Check A/C circuit.
  16. Check Camshaft Position (CP) sensor circuit.
  17. Check Mass Airflow (MAF) sensor circuit.
  18. Check front Oxygen Sensor (O2S) circuit.
  19. Check Knock Sensor (KS) circuit.
  20. Check PCM inputs/outputs and PCM.

Intermittent Simulation

To reproduce conditions creating an intermittent fault, use following methods

  1. Lightly vibrate component.
  2. Heat component.
  3. Wiggle or bend wiring harness.
  4. Spray component with water.
  5. Remove/apply vacuum source.

Monitor circuit/component voltage or resistance while simulating intermittent. If engine is running, monitor for self-diagnostic codes. Use test results to identify a faulty component or circuit.

More articles — Engine Controls - Tests W/o Codes 1.6L