Toyota Celica 1994-1998 Repair Guide



The Electronic Fuel Injection (EFI) system precisely controls fuel injection to match engine requirements. This in turn reduces emissions and increases driveability. The ECM receives input from various sensors to determine engine operating conditions. These sensors provide the input to the control unit which determines the amount of fuel to be injected as well as other variables such as idle speed. These inputs and their corresponding sensors include:

Manifold Absolute Pressure (MAP) sensor
Intake Air Temperature (IAT) sensor
Engine Coolant Temperature (ECT) sensor
Engine speed (RPM)
Throttle valve opening-Throttle Position Sensor
Exhaust oxygen content-Oxygen Sensor