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.

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