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.
1992 Infiniti Q45 BaseFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes
- Introduction
- Self-Diagnostic System
- Diagnostic Trouble Code Definition
- Trouble Code Charts
- Notes
- DTC 11 - Crank Angle Sensor
- DTC 12 - Airflow Meter
- DTC 13 - Engine (Coolant) Temperature Sensor
- DTC 14 - Vehicle Speed Sensor
- DTC 16 - Traction Control System (TCS) Signal
- DTC 21 - Ignition Signal Circuit
- DTC 31 - Engine Control Unit (Ecu)
- DTC 32 - EGR System Function
- DTCS 33 & 53 - Left & Right Oxygen Sensors
- DTC 34 - Knock (Detonation) Sensor
- DTC 35 - Exhaust Gas Temperature Sensor
- DTC 43 - Throttle Position Sensor
- DTC 45 - Injector Leak
- DTC 46 - Secondary Throttle Sensor
- DTC 51 - Injector Circuit
- DTC 54 - Automatic Transmission Signal
- Summary
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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