Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2000 Infiniti QX4FACTORY OEM SERVICE PROCEDURE
Engine Controls - Self-Diagnostics
- Diagnostic Tests
- Notes
- Diagnostic Trouble Code Identification
- ECM Harness Connector
- DTC P0100: Mass Airflow (MAF) Sensor
- DTC P0105: Absolute Pressure (AP) Sensor
- DTC P0110: Intake Air Temperature (IAT) Sensor
- DTC P0115 Or P0125: Engine Coolant Temperature (ECT) Sensor
- DTC P0120: Throttle Position (TP) Sensor
- DTC P0130: Right Bank, Or DTC P0150: Left Bank Front Heated Oxygen Sensor
- DTC P0131 Or P0132: Right Bank, Or DTC P0151 Or P0152: Left Bank Front Heated Oxygen Sensor
- DTC P0133: Right Bank, Or DTC P0153: Left Bank Front Heated Oxygen Sensor
- DTC P0134: Right Bank, Or DTC P0154: Left Bank Front Heated Oxygen Sensor
- DTC P0135: Right Bank, Or DTC P0155: Left Bank Front Ho2S Heater
- DTC P0137, P0138, P0139 Or P0140: Right Bank, Or DTC P0157, P0158, P0159, Or P0160: Left Bank Rear Heated Oxygen Sensor
- DTC P0141: Right Bank, Or DTC P0161: Left Bank Rear Ho2S Heater
- DTC P0171, P0172, P0174 Or P0175: Fuel Injection System Function
- DTC P0180: Fuel Tank Temperature (FTT) Sensor
- DTC P0300-P0306: Cylinder Or Multiple Cylinder Misfire
- DTC P0325: Knock Sensor
- DTC P0335 Or P1336: Crankshaft Position (CKP) Sensor
- DTC P0340: Camshaft Position (CMP) Sensor
- DTC P0400: EGR Function
- DTC P0402: EGR Control BACKPRESSURE Transducer (EGRC-BPT)
- DTC P0420: Right Bank, Or DTC P0430: Left Bank 3-Way Catalyst Function
- DTC P0440 Or P1440: EVAP Control System
- DTC P0443: EVAP Canister Purge Volume Control Valve (EVAP-CPVCV)
- DTC P0446: EVAP Canister Vent Control Valve (EVAP-CVCV)
- DTC P0450: EVAP Control System Pressure Sensor (EVAP-CSPS)
- DTC P0500: Vehicle Speed Sensor (VSS)
- DTC P0505: Idle Air Control (IAC) Valve
- DTC P0510: Closed Throttle Position (TP) Switch
- DTC P0600: A/T Control
- DTC P0605: ECM
- DTC P1105: Manifold Absolute Pressure (Map)/Barometric Pressure (BARO) Solenoid
- DTC P1148: Right Bank, Or DTC P1168: Left Bank Closed Loop Control
- DTC P1320: Ignition Signal
- DTC P1336: Crankshaft Position (CKP) Sensor
- DTC P1400: EGR Control (EGRC) Solenoid
- DTC P1401: EGR Temperature Sensor
- DTC P1402: EGR Function
- DTC P1440: EVAP Control System
- DTC P1444: EVAP Canister Purge Volume Control Valve (EVAP-CPVCV)
- DTC P1446: EVAP Canister Vent Control Valve (EVAP-CVCV)
- DTC P1447: EVAP Control System Purge Flow Monitoring
- DTC P1448: EVAP Canister Vent Control Valve (EVAP-CVCV)
- DTC P1490: EVAP Vacuum Cut Valve By-Pass Valve
- DTC P1491: EVAP Vacuum Cut Valve By-Pass Valve
- DTC P1605: A/T Diagnostic Communication Line
- DTC P1706: Park/Neutral Position (PNP) Switch
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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