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Home >> Jeep >> 1993 >> Grand Cherokee Base, 5.2 Y, AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation - 5.2L >> Computerized Engine Controls >> Input Devices >> Sync Pick-Up

Sync Pick-Up

Sync pick-up is located inside distributor and is used along with crankshaft position sensor to determine fuel injection sequence. Sync pick-up consists of a single shutter blade that passes through Hall Effect switch causing a signal to be sent to PCM.

PCM compares signals received from crankshaft position sensor and sync pick-up to determine which piston is coming up to top dead center. PCM then fires injectors in proper order for engine to operate.

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