GM 15546837 Sensor,Speed

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Various engine sensors and components have checking procedures,the engine coolant temperature (ECT) sensor is a thermistor that changes resistance with temperature, and a failure in the circuit can cause trouble codes. The resistance should be measured when cold and warm while ensuring reference voltage from PCM is around 5.0 volts for the verification. Manifold Absolute Pressure (MAP) Sensor monitors changes in intake manifold pressure then varies its voltage output accordingly. Look at the reference voltage and signal voltage with the ignition on and engine off, and observe voltage changes as the engine's vacuum changes. Intake Air Temperature (IAT) Sensor acts as a thermistor where you can measure its resistance at different temperatures to make sure it changes as expected. Also, use a scan tool to monitor the IAT sensor for performance. The oxygen sensor in exhaust detects oxygen content which you can check its millivolt signal while warming up your engine. Check whether the oxygen sensor heater has correct voltage or not. Vehicle Speed Sensor (VSS) provides speed data to PCM which can be checked for reference voltage. Depending on the type of engine, Camshaft Sensor and Crankshaft Sensor should be checked for resistance and proper signal output. Finally, Knock Sensors detect engine knock which should be checked for reference voltage and resistance. If any component fails these checks, replacement may be necessary.

To remove the VSS in 1993 and later models, the rear of the vehicle needs to be raised and supported on jackstands, the electrical connector needs to be disconnected, and the retaining bolt needs to be removed to withdraw the sensor from the transmission.

If any component fails these checks, replacement may be necessary.

To check the VSS operation, raise the vehicle and locate the sensor. Check the terminals and wires for any looseness or breaks, and repair as necessary. Back probe the two wire terminals of the VSS connector and connect a voltmeter set on the AC volts scale. With the ignition key on and the engine off, rotate one rear tire while monitoring the voltmeter. The sensor should produce a minimum of 0.5 volts, increasing as the transmission output shaft rotates faster.

The vehicle speed sensor (VSS) provides speed data to the PCM. To check it, you can check for reference voltage.

In 1993 and later models, the VSS is mounted on the transmission rear extension housing.

The engine coolant temperature (ECT) sensor is a thermistor that changes resistance with temperature. To check it, measure the resistance while cold and warm, and ensure the reference voltage from the PCM is around 5.0 volts.