Programmable fuel injection system (PGM-FI) is a distributed sequential fuel injection system.
Air conditioner magnetic clutch relay (A/C)
When the ECM receives a command to turn on the air conditioner, it delays power to the air conditioner compressor for a while and richens the mixture to ensure a smooth transition to running the air conditioner on.
Air-to-fuel ratio sensor (A/F)
The A/F sensor operates over a wide range of air/fuel ratios. The A/F sensor is installed upstream of the three-way catalytic converter (TWC) and sends signals to the ECM/PCM, which changes the duration of fuel injection accordingly.
Barometric pressure sensor (BARO)
The BARO sensor is installed inside the ECM. It converts the atmospheric pressure value into a voltage signal that corrects the basic duration of the fuel injection process.
Camshaft position sensor (CMP)
The CMP sensor determines the position of cylinder #1 as a reference to control the sequential injection of fuel into each cylinder.
Crankshaft position sensor (TFR)
The TFR sensor determines the crankshaft speed, the ignition timing and the start of fuel injection for each cylinder, and also determines the misfire in the engine cylinders.
Coolant temperature sensors 1 and 2 (EATING)
ECT sensors 1 and 2 are a resistor that changes its resistance depending on temperature (thermistor). The resistance decreases as the engine coolant temperature rises.