Engine Sensor Abreviations & Functions
IAT - Intake Air Temperature. Senses the temp of the air coming into the intake to control fuel delivery. Also known as the
MAT sensor before 1991
TPS - Throttle Position Sensor. Senses the degree of opening of the throttle butterfly to control idle and fuel delivery.
Crankshaft Position - Crankshaft Position Sensor. Tells the computer the position of the crankshaft, and the engine RPM's
IAC - Idle Air Control motor. Controls how much air is let into the TB during idle.
MAP - Manifold Absolute Pressure sensor. Monitors and sends intake manifold pressure changes to the ECM to control fuel delivery and ignition timing
TCC - Torque Convertor Clutch solenoid. Locks/unlocks third gear to lower rpms for better fuel milege
CTS - Coolant Temperature Sensor. Tells the computer the operating temp of the engine, to control the fan and fuel delivery
ESC - Electronic Spark Control (Knock Sensor). Retards the ignition timing if knocking or pinging is detected.
PCV - Positive Crankcase Ventilation. Controls pressure in the crankcase
VSS - Vehicle Speed Sensor. Tells the computer how fast you are going, and controls the TCC
EGR - Exhaust Gas Recirculation valve. Recirculates some exhaust gas into the intake manifold to help with emissions and pinging by cooling the combustion chamber.
MAF - Mass Airflow Sensor. (1987 and earlier only) Measures amount of air entering engine to control fuel delivery
O2 - Oxygen Sensor. Monitors Oxygen content in the exhaust to control fuel delivery
Ignition Module - Delivers the ignition signals to the coil packs, telling them when to spark, etc.
DIS - Direct (or Distributerless) ignition system. The ignition system on our cars.Think that is all the major ones.