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.
1993 Infiniti G20 AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Controls - System/Component Tests
- Introduction
- Computerized Engine Controls
- Engine Sensors & Switches
- Notes
- Mass Airflow (MAF) Sensor
- Coolant Temperature Sensor
- Crankshaft Position Sensor
- Heated Oxygen Sensor (Ho2S)
- Heated Oxygen Sensor Heater
- EGR Temperature Sensor (CALIFORNIA)
- Fuel Temperature Sensor (J30)
- Inhibitor Switch (G20 A/T)
- Neutral Switch (G20 M/T)
- Inhibitor Switch (J30 & Q45)
- Knock Sensor
- Power Steering Pressure Switch
- Start Signal
- Sub-Crankshaft Position Sensor (Q45)
- Throttle Position Sensor (G20 Without CTP Switch)
- Throttle Position Sensor (TPS) & Closed Throttle Position Switch
- Vehicle Speed Sensor
- Relays & Solenoids
- Fuel System
- Idle Control System
- Ignition System
- Emission Systems & Sub-Systems
- Miscellaneous Controls
- Component Locations
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.