PT Cruiser L4-2.4L Turbo VIN G (2004)
Transmission Control System Relay: Description and Operation
TRANSMISSION CONTROL RELAY
DESCRIPTION
The transmission control relay is located in the Power Distribution Center (PDC) on the left side of the engine compartment between the brake master
cylinder and the air cleaner assembly (Fig. 335).
OPERATION
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. 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
(ignition key turned to the "run" position or after cranking engine), 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.
