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.
2018 Infiniti QX80 AWDFACTORY OEM SERVICE PROCEDURE
Engine Control System (Diagnostics) (1 Of 2)
- Description
- Component Parts
- Engine Control System
- Accelerator Pedal Position Sensor
- Air Fuel Ratio (A/F) Sensor 1
- ASCD Brake Switch & Stop Lamp Switch
- ASCD Indicator
- ASCD Steering Switch
- Battery Current Sensor (With Battery Temperature Sensor)
- Camshaft Position Sensor
- Crankshaft Position Sensor
- ECM
- Electric Throttle Control Actuator
- Electrically-Controlled Cooling Fan Coupling
- Engine Coolant Temperature Sensor 1
- Engine Coolant Temperature Sensor 2
- Engine Oil Pressure Sensor
- Engine Oil Temperature Sensor
- EVAP Canister Purge Volume Control Solenoid Valve
- EVAP Canister Vent Control Valve
- EVAP Control System Pressure Sensor
- Exhaust Gas Temperature Sensor
- Exhaust Valve Timing Control Position Sensor
- Exhaust Valve Timing Control Solenoid Valve
- Fuel Injector
- Fuel Level Sensor
- Fuel Pump Control Module (FPCM)
- Fuel Rail Pressure Sensor
- Fuel Tank Temperature Sensor
- Heated Oxygen Sensor 2
- High Pressure Fuel Pump
- ICC Brake Switch & Stop Lamp Switch
- ICC Steering Switch
- Ignition Coil With Power Transistor
- Intake Valve Timing Control Solenoid Valve
- Knock Sensor
- Low Pressure Fuel Pump
- Malfunction Indicator Lamp (Mil)
- Mass Air Flow Sensor (With Intake Air Temperature Sensor)
- Multi-Way Control Valve
- Power Steering Pressure (PSP) Sensor
- Refrigerant Pressure Sensor
- VVEL Actuator Motor
- VVEL Actuator Motor Relay
- VVEL Control Module
- VVEL Control Shaft Position Sensor
- Mechanical System
- System
- Air Conditioning Cut Control
- Alternator Power Generation Voltage Variable Control System
- Automatic Speed Control Device (ASCD)
- Can Communication
- Cooling Fan Control
- Direct Injection Gasoline System
- System Description
- Notes
- Input/Output Signal Chart
- System Description
- Various Fuel Injection Increase/Decrease Compensation
- Fuel Injection Control
- Mixture Ratio Feedback Control (Closed Loop Control)
- Exhaust Gas Temperature Feedback Control
- Mixture Ratio Self-Learning Control
- Fuel Injection Timing
- Stratified-Charge Start Control
- Fuel Shut-Off
- System Description
- Electric Ignition System
- Engine Control System
- Evaporative Emission System
- Exhaust Valve Timing Control
- Fuel Filler Cap Warning System
- Fuel Pressure Control
- Intake Valve Timing Control
- On Board Refueling Vapor Recovery (ORVR)
- Thermal Management Control
- VVEL System
- Diagnosis System (ECM)
- On Board Diagnostic (OBD) System
- Component Parts
- Basic Inspection
- Engine Control System
- Diagnostic Work Sheet
- Work Flow
- Basic Inspection
- Additional Service When Replacing ECM
- Additional Service When Replacing VVEL Control Module
- VIN Registration
- Accelerator Pedal Released Position Learning
- Throttle Valve Closed Position Learning
- Idle Air Volume Learning
- VVEL Control Shaft Position Sensor Adjustment
- Mixture Ratio Self-Learning Value Clear
- Fuel Pressure
- How To Set SRT Code
- How To Erase Permanent DTC
- Engine Control System
Factory Service Tools
Use the Manual With the Right Hardware
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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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