Grand Cherokee 2WD L6-4.0L VIN S (1997)
Transmission Control System Relay: Description and Operation
CIRCUIT OPERATION
The electronic transmission relay powers the overdrive solenoid, torque convertor clutch solenoid, and governor pressure solenoid. All three
solenoids are molded together.
Power for the coil side of the relay is supplied on circuit K72. This circuit is controlled by the Powertrain Control Module (PCM), and is the feed
for the generator. Ground for the coil side of the relay is controlled by the PCM on circuit T66. This circuit connects to cavity B3O of the PCM
connector.
When the PCM grounds the relay, the relay contacts connect circuit F92 to circuit T20. Circuit T2O powers the solenoids.
