Toyota Camry 1983-1996 Repair Guide

General Information

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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 manifold absolute pressure-MAP or Vacuum Sensor
 
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
 

 
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