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TRANSMISSION CONTROL DESCRIPTION The Transmission Control Module (TCM) is located in the engine compartment on the right (passenger) OPERATION The Transmission Control Module (TCM) is the controlling unit for all electronic operations of the Some examples of direct inputs to the TCM are: • Ignition “ON” voltage • Transmission Control Relay (Switched B+) • Throttle Position Sensor • Crankshaft Position Sensor • Transmission Range Sensor • Pressure Switches • Transmission Temperature Sensor • Input Shaft Speed Sensor • Output Shaft Speed Sensor • Line Pressure Sensor Some examples of indirect inputs to the TCM are: • Engine/Body Identification • Manifold Pressure • Target Idle • Torque Reduction Confirmation • Engine Coolant Temperature • Ambient/Battery Temperature • DRBt Scan Tool Communication ious inputs, the TCM determines the appropriate Some examples of TCM direct outputs are: • Solenoids • Torque Reduction Request • PRNDL Position (to BCM) outputs, the TCM has other important responsibili- • Storing and maintaining Clutch Volume Indexes (CVI) • Storing and selecting appropriate Shift Sched- ules • System self-diagnostics • Diagnostic capabilities (with DRBt scan tool) NOTE: If the TCM has been replaced, the “Quick CONTROL MODULES/ TRANSMISSION CONTROL MODULE - STANDARD BATTERY FEED A fused, direct battery feed to the TCM is used for continuous power. This battery voltage is necessary CLUTCH VOLUME INDEXES (CVI) An important function of the TCM is to monitor Clutch Volume Indexes (CVI). CVIs represent the vol- The TCM monitors gear ratio changes by monitor- ing the Input and Output Speed Sensors. The Input, Fig. 12 Transmission Control Module Location 1 - TRANSMISSION CONTROL MODULE 8E - 18 ELECTRONIC CONTROL MODULES AN |