Electrical Chapter 20 sensors

A sensor that does not use a current supplied by the ECM to operate.

• passive sensor

• active sensor

• pull-up sensor

• pull-down sensor

A sensor used to measure rotational speed, including wheel speed, vehicle speed, engine speed, and camshaft and crankshaft position.

• variable reluctance sensor

• active sensor

• rotational inductance sensor

• rotational speed sensor

A switch connected between the ECM and a battery positive.

• pull-down sensor

• pull-up sensor

• active sensor

• passive sensor

A circuit used for safety reasons that is used to verify throttle position.

• idle validation switch

• throttle position sensor

• rev limiter circuit

• manifold absolute pressure sensor

A sensor that detects oxygen ions originating from nitric oxide from among the other oxygen ions present in the exhaust gas.

• NOX sensor

• oxygen sensor

• soot sensor

• ammonia sensor

A switch connected between the ECM and a negative ground current potential.

• pull-down switch

• pull-up switch

• rheostat

• potentiometer

A precisely regulated voltage supplied by the ECM to sensors; the value is typically 5 VDC, but some manufacturers use 8 or 12 volts.

• Vref

• IVR

• digital

• feedback

A sensor that uses a current supplied by the ECM to operate.

• active sensor

• passive sensor

• hall effect sensor

• variable reluctance sensor

A temperature-sensitive variable resistor commonly used to measure coolant, oil, fuel, and air temperatures.

• thermistor

• transistor

• pyrometer sensor

• thermal potentiometer

A variable resistor with three connections— one at each end of a resistive path, and a third sliding contact that moves along the resistive pathway.

• rheostat

• potentiometer

• passive sensor

• digital inverter