Grand Cherokee 2WD L6-4.0L VIN S (1997)
Powertrain Control Module: Description and Operation
Circuit Operation
Battery Feed
CIRCUIT OPERATION
Circuit F5 from fuse 20 in the Power Distribution Center (PDC) supplies battery voltage to cavity A22 of the Powertrain Control Module (PCM).
Ground
CIRCUIT OPERATION
Circuit Z12 connects to cavities A31 and A32 of the PCM. The Z12 circuit provides ground for PCM internal drivers that operate high current
devices like the injectors and ignition coil.
Internal to the PCM, the ground circuit connects to the PCM sensor return circuit (from circuit K4).
