4 Hi engagement
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Join Date: Dec 1997
Location: Windsor,Ontario,Canada
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My97,
The switch tells the GEM that the truck is in 4x4 mode. The GEM then grounds a relay for the magnetic clutch coil in the T-case and the solenoid for the front axle vacuum motor which engages the front axle. On the 97 models it also tells the PCM when the truck is in 4Lo so it can adjust the tranny shift points and engine parameters.
Regards
Jean Marc Chartier
The switch tells the GEM that the truck is in 4x4 mode. The GEM then grounds a relay for the magnetic clutch coil in the T-case and the solenoid for the front axle vacuum motor which engages the front axle. On the 97 models it also tells the PCM when the truck is in 4Lo so it can adjust the tranny shift points and engine parameters.
Regards
Jean Marc Chartier
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