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.
2009 Infiniti QX56 AWDFACTORY OEM SERVICE PROCEDURE
Engine Control System - Introduction
- Basic Inspection
- Function Diagnosis
- Engine Control System
- MULTIPORT Fuel Injection System
- Electric Ignition System
- Air Conditioning Cut Control
- Automatic Speed Control Device (ASCD)
- Can Communication
- Cooling Fan Control
- Evaporative Emission System
- Intake Valve Timing Control
- On Board Diagnostic (OBD) System
- Introduction
- Two Trip Detection Logic
- Emission-related Diagnostic Information
- Malfunction Indicator Lamp (MIL)
- OBD System Operation Chart
- Relationship Between Mil, 1ST Trip DTC, DTC, And Detectable Items
- Summary Chart
- Relationship Between Mil, DTC, 1ST Trip DTC And Driving Patterns For "Misfire" < Exhaust Quality Deterioration >, "Fuel Injection System"
- Explanation For Driving Patterns For "Misfire < Exhaust Quality Deterioration >", "Fuel Injection System"
- Relationship Between Mil, DTC, 1ST Trip DTC And Driving Patterns Except For "Misfire < Exhaust Quality Deterioration >", "Fuel Injection System"
- Explanation For Driving Patterns Except For "Misfire < Exhaust Quality Deterioration >", "Fuel Injection System"
- CONSULT-III Function (ENGINE)
- Generic Scan Tool (GST) Function
- Component Diagnosis
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.