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Home >> Jeep >> 1997 >> Grand Cherokee 4WD L6-4.0L VIN S >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - Powertrain Management >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Description and Operation >> Inputs >> Transmission Park/Neutral Switch

Transmission Park/Neutral Switch

TRANSMISSION PARK/NEUTRAL SWITCH-PCM INPUT

The park/neutral switch is located on the transmission housing and provides an input to the Powertrain Control Module (PCM). This will indicate that the automatic transmission is in Park, Neutral or a drive gear selection. This input is used to determine idle speed (varying with gear selection), fuel injector pulse width, ignition timing advance and vehicle speed control operation.
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