Check Engine Light On Dash
Check Engine Light On, Sensor Descriptions

Automotive Engine Sensors

Choose the sensor below for descriptions

  1. Powertrain Control Module (PCM)
  2. Throttle Position (TP) sensor
  3. Mass Air Flow (MAF) sensor
  4. Intake Air Temperature (IAT) sensor
  5. Idle Air Control (IAC) valve
  6. Engine Coolant Temperature (ECT) sensor
  7. Heated Oxygen Sensor (HO2S)
  8. Camshaft Position (CMP) sensor
  9. Knock Sensor (KS)
  10. Vehicle Speed Sensor (VSS)
  11. Crankshaft Position (CKP) sensor
  12. Fuel Injector
  13. Coolant Temperature Sensor (CTS)
  14. Exhaust Gas Recirculation (EGR)
  15. Manifold Absolute Pressure (MAP)


Throttle Position (TP) sensor

Monitors the position of the accelerator pedal and throttle linkage so the computer can make accurate air/fuel mixture adjustments.

TPS Sensor

The Throttle Position (TP) sensor and accelerator pedal position (APP) sensor are the only sensors sending data to the Powertrain Control Module (PCM) that the vehicle operator has direct control over. The TP sensor is a three wire potentiometer that provides an analog signal to the computer. This signal represents how far the throttle plates have opened.

The Powertrain Control Module calculates how much air should have entered the engine and compares this value with the Manifold Absolute Pressure (MAP) sensor or Mass Air Flow (MAF) sensor value. The PCM uses this information to calculate fuel delivery and ignition timing requirements.

The PCM on vehicles equipped with an electronic transmission utilize the TP sensor in combination with the MAP and MAF sensor values to determine shift schedules and torque converter clutch application.