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.
1994 Infiniti J30FACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes
- Introduction
- Self-Diagnostic System
- Final Check
- Trouble Code Definition
- Diagnostic Trouble Code (DTC) Testing (J30)
- 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 21: Ignition Signal
- DTC 31: ECM
- DTC 32: EGR Function (CALIF.)
- DTC 33 (Left) & DTC 53:(Right) Heated Oxygen Sensor (Ho2S)
- DTC 34: Knock Sensor
- DTC 35: EGR Temperature Sensor (CALIF.)
- DTC 42: Fuel Temperature Sensor
- DTC 43: Throttle Position Sensor (TPS)
- DTC 45: Injector Leak (CALIF.)
- DTC 51: Injector (CALIF.)
- DTC 54: Automatic Transmission (A/T) Control
- Summary
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.