A List Of The Commonly Used Automotive/Engine Sensors

A List Of The Commonly Used Automotive/Engine Sensors.

Engine Sensors:

1.) TBS (turbocharger boost sensor): provides information on intake manifold air pressure to the vehicle’s computer/ECM and is used to control of the percentage of fueling requested by the operator.

2.) TRS (timing reference sensor): sends a signal to your ECM for optimum injection timing and low emissions. Cummins refer to this sensor as an EPS (engine position sensor) sensor. Caterpillar employs an engine speed timing sensor.

3.) SRS (synchronous reference sensor): provides a ‘once per cam revolution‘ to the ECM to determine which cylinder is at TDC-compression on DDEC.

4.) OPS (oil pressure sensor): advises the ECM of the engine main oil gallery pressure. Engine protective features programmed into the ECM are calibrated to trigger an engine speed and power reduction feature. When the oil pressure drops to a point lower than desired.

5.) OTS (oil temperature sensor): indicates the engine oil temperature at all times to the ECM.

6.) OLS (oil level sensor): utilizes optical technology to “see” oil level for safe monitoring of the oil level.

7.) CTS (coolant temperature sensor): used to advise the ECM of the engine coolant temperature. This sensor can be used to trigger an engine protection response; it has an automatic power-down feature and shutdown similar to that of the OPS and OTS.

8.) CLS (coolant level sensor): monitors the level of coolant in the radiator top tank or in a remote surge tank.

9.) SLS (starter lockout sensor): this sensor prevents starter engagement to prevent grinding of the flywheel and starter pinion gears.

10.) VSS (vehicle speed sensor): usually mounted over the vehicle transmission output shaft to provide the ECM with the speed of the vehicle. This signal is used for cruise control and automatic progressive application of the engine Jake brakes to maintain a preprogrammed maximum vehicle speed.

11.) EFPA (electronic foot pedal assembly): is often referred to as the TPS or throttle position sensor. This sensor is the main input to the ECM to tell it how much fueling the operator is requesting.

12.) BARO (barometric pressure sensor): is sometimes called an atmospheric ambient air pressure sensor, and is used to adjust the signal to adjust timing and fuel metering based on engine operating altitude.

13.) ATS (air-temperature sensor): indicates intake manifold temperature to allow the ECM to alter the injector PWM signal for emissions control.

14.) FRS (fuel restriction sensor): measures fuel system and restriction at fuel pump inlet. Sensor measures actual inlet restriction.

15.) FTS (fuel temperature sensor): provides fuel temperature information to the ECM.

16.) FPS (fuel pressure sensor): usually monitors the fuel pressure on the outlet side of the secondary fuel filter. This sensor is used for diagnostics purposes.

17.) CPS (crankcase pressure sensor): usually found on larger-displacement engines in mining, stationary and marine engine applications. This sensor can be profiled to monitor crankcase pressure.

18.) CPS (coolant pressure sensor): normally employed on larger-displacement engines to closely monitor water pump/engine block pressure.

19.) ACLS (auxiliary coolant level sensor): indicates when the coolant level requires needs to be filled. Positioned within the top radiator tank or remote surge tank, this sensor is located above the CLS.

Updated: May 14, 2011 — 7:45 pm

1 Comment

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  1. Thanks for the great reference list. This is handy to have for any shade tree mechanic.

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