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 Acura Integra (GS-R) L4-1797cc 1.8L DOHC (VTEC)FACTORY OEM SERVICE PROCEDURE
Main Relay (Computer/Fuel System): Description and Operation
PGM-FI Main Relay Schematic View:
PURPOSE
Supplies power to the fuel injectors, Engine Control Module (ECM), and fuel pump.
OPERATION
One relay is energized whenever the ignition is on which supplies the battery voltage to the ECM, power to the fuel injectors, and power for the second relay. The second relay is energized for 2 seconds when the ignition is switched on, and when the engine is running, to supply power to the fuel pump.
CONSTRUCTION
The Programmed Fuel Injection (PGM-FI) Main Relay actually contains two individual relays.
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.