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Home >> GMC >> 1996 >> C3500 HD 7.4 J, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation - Diesel >> Computerized Engine Controls >> Input Devices >> Crankshaft Position Sensor
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Crankshaft Position Sensor

Sensor is a Permanent Magnet (PM) type sensor and is mounted at front of crankshaft. Front crankshaft hub includes a wheel with 4 slots. PCM uses crankshaft position sensor to detect engine RPM. This signal is used to improve idle. If pump cam signal is lost, PCM will use crankshaft position signal data to control injection timing and fuel flow.

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