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.
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HOMESERVICE MANUALSINFINITI2003FX45REPAIR AND DIAGNOSISENGINE PERFORMANCETHEORY AND OPERATIONENGINE CONTROLS - THEORY & OPERATION
2003 Infiniti FX45
Engine Controls - Theory & Operation
2003 Infiniti FX45SECTION Engine Controls - Theory & Operation
- Introduction
- Air Induction Systems
- Computerized Engine Controls
- Notes
- Engine Control Module
- Input Devices
- Notes
- Absolute Pressure Sensor
- A/C Switch
- Accelerator Pedal Position (APP) Sensor
- Battery Voltage Compensation
- Camshaft Position Sensor
- Closed Throttle Position Switch
- Crankshaft Position Sensor
- Engine Coolant Temperature Sensor
- Fuel Level Sensor
- Fuel Tank Temperature Sensor
- Heated Oxygen Sensor
- Ignition Switch
- Intake Air Temperature Sensor
- Intake Valve Timing Control Position Sensor
- Knock Sensor
- Mass Airflow Sensor
- Neutral Switch (M/T Models)
- Park/Neutral Position Switch (A/T Models)
- Power Steering Pressure Switch
- Radiator Coolant Temperature Sensor (Q45)
- Throttle Position Sensor (TP) Sensor
- Vehicle Speed Signal
- Output Signals
- Fuel System
- Ignition Systems
- Emission Systems
- Self-Diagnostic System
- Intake Valve Timing Control System
- Miscellaneous Controls
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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.