GMC 10456082 Sensor,Knock

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.

Loss of the ESC signal will cause the PCM to constantly retard EST, leading to sluggish performance.

The IAT sensor measures intake air temperature, affecting the voltage signal to the PCM.

The location of the knock sensor varies depending on the year and engine application, but it is typically found on the rear of the engine block or the side of the cylinder head.

For models from 1988 to 1995, the ESC module is located near the throttle body. To replace it, disconnect the negative battery terminal and detach the electrical connector from the module. Remove the mounting screws and detach the module. Installation is the reverse of removal.