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.
1991 Infiniti G20 AutomaticFACTORY OEM SERVICE PROCEDURE
Fuel Control: Notes
Fuel system is controlled by ECU based upon the following sensor input signals. If feedback system does not function properly, check input signals before replacing ECU.
FUEL CONTROL SYSTEM INPUT SIGNALS
| Application | Model Usage | ||||
|---|---|---|---|---|---|
| A/C Clutch Signal | G20 | ||||
| Airflow Meter | G20 & M30 | ||||
| Battery Voltage | G20 & M30 | ||||
| Crank Angle Sensor | G20 & M30 | ||||
| Engine (Coolant) Temperature | G20 & M30 | ||||
| Exhaust Gas Temperature Sensor | G20 & M30 | ||||
| Fuel Temperature Sensor | M30 | ||||
| Ignition (START) Switch | G20 & M30 | ||||
| Neutral Switch | (1) G20 | ||||
| Oxygen Sensor | G20 & M30 | ||||
| Park/Neutral (Inhibitor) Switch | G20 & (2) M30 | ||||
| Power Steering Pressure Switch | G20 | ||||
| Throttle Position Sensor | G20 & M30 | ||||
| Throttle (Idle) Switch | M30 | ||||
| Vehicle Speed Sensor | G20 & M30 | ||||
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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.