Cadillac 12596851 Sensor,Crankshaft Position

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The checking procedures for various engine sensors and components are as follows: The engine coolant temperature (ECT) sensor is a thermistor that changes resistance with temperature, and a failure in the circuit can trigger trouble codes. To check it, measure the resistance while cold and warm, and ensure the reference voltage from the PCM is around 5.0 volts. The manifold absolute pressure (MAP) sensor monitors intake manifold pressure changes and varies its voltage output accordingly. Check the reference voltage and signal voltage with the ignition on and engine off, and observe voltage changes as the engine's vacuum changes. The intake air temperature (IAT) sensor acts as a thermistor, and you can measure its resistance at different temperatures to ensure it changes as expected. Also, monitor the IAT sensor using a scan tool to verify its performance. The oxygen sensor in the exhaust monitors oxygen content, and you can check its millivolt signal while the engine warms up. Inspect the oxygen sensor heater and ensure it receives proper voltage. The vehicle speed sensor (VSS) provides speed data to the PCM and can be checked for reference voltage. The camshaft sensor and crankshaft sensor, depending on the engine type, should be checked for resistance and proper signal output. Finally, the knock sensors detect engine knock and should be checked for reference voltage and resistance. If any component fails these checks, replacement may be necessary.

The ignition system will not operate without a crankshaft position sensor input.

If the MIL is illuminated after installation, it may indicate a Diagnostic Trouble Code (OTC) related to the CKP system variation not learned. In this case, a dealer technician can perform the necessary procedure to relearn the variation between the CKP and CMP sensors and clear the OTC from the PCM's memory.

When replacing the CKP sensor, a Crankshaft Position Sensor Variation Learning Procedure should be performed to avoid false diagnostic trouble codes. This involves disconnecting the battery cable, raising and securing the vehicle, removing the skid plate if necessary, disconnecting the electrical connector, removing the mounting bolt, and then installing the new sensor.

Remove the mounting bolt and discard the old o-ring.

The oxygen sensor in the exhaust monitors oxygen content. To check it, you can check its millivolt signal while the engine warms up. It is also important to inspect the oxygen sensor heater and ensure it receives proper voltage.

Loosen the right front wheel lug nuts, raise the vehicle, and remove the wheel and wheel well splash shield.

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.