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Home >> Jeep >> 1997 >> Cherokee 4WD L6-4.0L VIN S >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Engine Control Module >> Description and Operation >> Modes of Operation >> Engine Warm-Up Mode
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Engine Warm-Up Mode

ENGINE WARM-UP MODE
This is an open loop mode. The Powertrain Control Module (PCM) adjusts injector pulse width and controls injector synchronization by controlling the fuel injectors' ground paths. The PCM adjusts ignition timing and engine idle speed. The PCM adjusts the idle speed by controlling the idle air control motor.

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