K 2500 Truck 4WD V8-6.5L DSL Turbo VIN S (1998)
Control Module: Description and Operation
1. The Transfer Case Control Module (TCCM) performs the following functions:
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Receives input signals
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Processes the signal information
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Develops output signals
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Sends the output signal in order to control the shifting of the transfer case
2. The TCCM receives input signals from the following sources:
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The transfer case shift select buttons
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The NSBU switch on the vehicles with automatic transmissions
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The clutch safety switch on the vehicles with manual transmissions
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The vehicle sped sensor calibrator module
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The encoder/motor range and the mode feedback signals
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The diagnostic enable
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The front axle mechanical status signal
3. In order to ensure the electronic shift system is operating properly, the transfer case control module (TCCM) continually performs diagnostics
checks on itself and other parts of the electronic shift system when the ignition switch is in the run position. The following are different types of
system checks that the TCCM continually performs.
