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Home >> Jeep >> 2001 >> Cherokee Classic, 4WD, Part Time >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Ignition Systems >> Timing Control Systems >> Powertrain Control Module
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Powertrain Control Module

Powertrain Control Module (PCM) opens and closes ignition coil ground circuit to adjust ignition timing according to engine operating conditions. Amount of electronic spark advance provided by PCM is determined by CKP sensor (engine RPM), ECT sensor, MAP sensor and TP sensor inputs. For additional information, see POWERTRAIN CONTROL MODULE (PCM)  under COMPUTERIZED ENGINE CONTROLS.

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