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.
1995 Infiniti Q45 BaseFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes 4.5L
- Introduction
- Self-Diagnostic System
- Final Check
- Trouble Code Definition
- Diagnostic Trouble Code (DTC) Testing
- Notes
- ECM Harness Connector
- DTC 11: Crankshaft Position (CKP) Sensor
- DTC 12: Mass Airflow (MAF) Sensor
- DTC 13: Engine Coolant Temperature (ECT) Sensor
- DTC 14: Vehicle Speed Sensor (VSS)
- DTC 16: Traction Control System (TCS) Signal
- DTC 21: Ignition Signal
- DTC 31: ECM
- DTC 32: EGR Function
- DTC 33, (Left) & DTC 53: (Right) Heated Oxygen Sensor (Ho2S)
- DTC 34: Knock Sensor
- DTC 35: EGR Temperature Sensor
- DTC 43: Throttle Position Sensor (TPS)
- DTC 45: Injector Leak
- DTC 46: Secondary Throttle Position Sensor (With TCS)
- DTC 51: Injector
- DTC 54: Automatic Transmission (A/T) Control
- Summary
- Wiring Diagrams
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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