Honda Accord/Prelude 1984-1995 Repair Guide

System Description

Print

The PGM-FI system precisely controls fuel injection to match engine requirements, reducing emissions and increasing driveability. The electric fuel pump supplies fuel to the pressure regulator. The fuel injectors are electric solenoid valves which open and close according to signals received from the Electronic Control Unit (ECU).

The ECU receives input from various sensors to determine engine operating conditions. This allows the ECU to determine the correct amount of fuel to be injected by it's preset program.

SERVICE PRECAUTIONS





Do not operate the fuel pump when the fuel lines and tank are empty.
 
Do not operate the fuel pump when removed from the fuel tank.
 
Do not reuse fuel hose clamps.
 
The washer(s) below any fuel system bolt (banjo fittings, service bolt, fuel filter, etc.) must be replaced whenever the bolt is loosened. Do not reuse the washers; a high-pressure fuel leak may result.
 
Make sure all ECU harness connectors are fastened securely. A poor connection can cause a high voltage surge and result in damage to integrated circuits.
 
Keep all ECU parts and harnesses dry during service. Protect the ECU and all solid-state components from rough handling or extremes of temperature.
 
Before attempting to remove any parts, turn the ignition switch OFF and disconnect the battery ground cable.
 
Always use a 12 volt battery as a power source, never a booster or high-voltage charging unit.
 
Do not disconnect the battery cables with the engine running.
 
Do not unplug any wiring connector with the engine running or the ignition ON , unless specifically instructed to do so.
 
Do not depress the accelerator pedal when starting.
 
Do not rev up the engine immediately after starting or just prior to shutdown.
 
Do not apply battery power directly to injectors.
 
Whenever possible, use a flashlight instead of a drop light.
 
Keep all open flame and smoking material out of the area.
 
Use a shop cloth or similar to catch fuel when opening the fuel system.
 
Relieve fuel system pressure before servicing.
 
Always use eye or full-face protection when working around fuel lines, fittings or components.
 
Always keep a dry chemical (class B-C) fire extinguisher near the area.
 

 
label.common.footer.alt.autozoneLogo