Dakota 2WD V8-4.7L VIN J (2005)
Transmission Control System Relay: Description and Operation
Automatic Transmission 545RFE
RELAY- TRANSMISSION CONTROL
DESCRIPTION
The relay is supplied fused B+ voltage, energized by the TCM, and is used to supply power to the solenoid pack when the transmission is in normal
operating mode.
OPERATION
When the relay is off, no power is supplied to the solenoid pack and the transmission is in limp-in mode. After a controller reset, the TCM, energizes
the relay. Prior to this, the TCM, verifies that the contacts are open by checking for no voltage at the switched battery terminals. After this is verified,
the voltage at the solenoid pack pressure switches is checked. After the relay is energized, the TCM, monitors the terminals to verify that the voltage is
greater than 3 volts.
