RAM 1500 Truck 2WD V8-4.7L VIN N (2002)
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Storing and maintaining Clutch Volume Indexes (CVI)
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Storing and selecting appropriate Shift Schedules
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System self-diagnostics
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Diagnostic capabilities (with DRB III scan tool)
NOTE: If the TCM has been replaced, the "Quick Learn Procedure" must be performed. (Refer to ELECTRONIC CONTROL MODULES/
TRANSMISSION CONTROL MODULE - STANDARD PROCEDURE)
Battery Feed
A fused, direct battery feed to the TCM is used for continuous power. This battery voltage is necessary to retain memory in the TCM. When the
battery (B+) is disconnected, this memory is lost. When the battery (B+) is restored, this memory loss is detected by the TCM and a Diagnostic
Trouble Code (DTC) is set.
Clutch Volumes
Clutch Volume Indexes (CVI)
An important function of the TCM is to monitor Clutch Volume Indexes (CVI). CVIs represent the volume of fluid needed to compress a clutch
pack.
The TCM monitors gear ratio changes by monitoring the Input and Output Speed Sensors. The Input, or Turbine Speed Sensor sends an electrical
signal to the TCM that represents input shaft rpm. The Output Speed Sensor provides the TCM with output shaft speed information.
