Grand Cherokee 2WD L6-242 4.0L VIN S MFI (1993)
Control Module: Description and Operation
PURPOSE
The Transmission Control Module (TCM) determines shift and converter lockup timing based on signals from the sensors. The valve body
solenoids are activated/deactivated accordingly.
OPERATION
The TCM has a self diagnostic program. Component and circuitry malfunctions can be diagnosed with the DRB III tester. Once a malfunction is
noted and stored in TCM memory, it is retained even after the problem has been corrected. To cancel a stored malfunction, simply disconnect and
reconnect the "Trans." fuse in the TCM harness.
