Grand Caravan V6-3.3L VIN R (2005)
Control Module: Description and Operation
Fig.14 Transmission Control Module (TCM) Location
The Transmission Control Module (TCM) is located behind the left fender and is fastened with three screws to three clips in the left frame rail forward
of the suspension (Fig. 14).
The TCM is the controlling unit for all electronic operations of the transaxle. The TCM receives information regarding vehicle operation from both
direct and indirect inputs, and selects the operational mode of the transaxle. Direct inputs are hardwired to, and used specifically by the TCM. Indirect
inputs originate from other components/modules, and are shared with the TCM via the J1850 communication bus.
Some examples of direct inputs to the TCM are:
-
Battery (B+) voltage
-
Ignition "ON" voltage
-
Transmission Control Relay (Switched B+)
-
Throttle Position Sensor
-
Crankshaft Position Sensor (CKP)
-
Transmission Range Sensor (TRS)
-
Pressure Switches (L/R, 2/4, OD)
-
Transmission Temperature Sensor (Integral to TRS)
-
Input Shaft Speed Sensor
-
Output Shaft Speed Sensor
Some examples of indirect inputs to the TCM are:
-
Engine/Body Identification
-
Manifold Pressure
-
Target Idle
-
Torque Reduction Confirmation
-
Speed Control ON/OFF Switch
-
Engine Coolant Temperature
-
Ambient/Battery Temperature
-
Brake Switch Status
-
DRB Communication
Based on the information received from these various inputs, the TCM determines the appropriate shift schedule and shift points, depending on the
present operating conditions and driver demand. This is possible through the control of various direct and indirect outputs.
Some examples of TCM direct outputs are:
-
Transmission Control Relay
-
Solenoids (LR/CC, 2/4, OD and UD)
-
Vehicle Speed (to PCM)
