Toyota Previa 1991-1997 Repair Information

General Information


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:

Intake air temperature-Intake Air Temperature Sensor
Coolant temperature-Water Temperature Sensor
Engine speed-Pulse signal from the distributor
Throttle valve opening-Throttle Position Sensor
Exhaust oxygen content-Oxygen Sensor