Wrangler L4-2.4L VIN 1 (2006)
Control Module: Description and Operation
The Transmission Control Module (TCM) is a sub-module within the Powertrain Control Module (PCM) (2).
PCM Mounting - Left Hand Drive
The PCM (2) is located on the right side of the dash panel in the engine compartment on left hand drive vehicles. The PCM is referred to as the NGC.
PCM Mounting - Right Hand Drive
The PCM (1) is located on the left side of the dash panel in the engine compartment on right hand drive vehicles.
The TCM is the controlling unit for all electronic operations of the transmission. The TCM receives information regarding vehicle operation from both
direct and indirect inputs, and selects the operational mode of the transmission. Direct inputs are hard-wired to, and used specifically by the TCM.
Indirect inputs originate from other components/modules, and are shared with the TCM via the PCI bus.
Some examples of direct inputs to the TCM are:
-
Battery (B+) voltage
-
Ignition "ON" voltage
-
Transmission Control Relay (Switched B+)
