Transmission Control Relay - Chrysler 2004 Concorde Service Manual

LH
TRANSFER SYSTEM (Continued)
The chain sprockets are not reversible. Check the
height difference using a straight edge (special tool
6311 or equivalent) and a set of feeler gauges.
If the output sprocket is lower than transfer
sprocket, add the amount measured to the shim that
was installed (Fig. 399).
Fig. 399 Checking Sprocket Height
1 - STRAIGHT EDGE
2 - FEELER GAUGE
If the output sprocket is higher than transfer
sprocket, subtract the amount measured to the shim
that was installed (Fig. 400).
Fig. 400 Checking Sprocket Height
1 - STRAIGHT EDGE
2 - FEELER GAUGE
TRANSMISSION CONTROL
RELAY
DESCRIPTION
The transmission control relay is located in the
Power Distribution Center (PDC) on the left side of
the engine compartment (Fig. 401).
Fig. 401 Transmission Control Relay Locat

1 - TRANSMISSION CONTROL RELAY

2 - PDC
3 - TCM
OPERATION
The relay is supplied fused B+ voltage, energized
by the PCM, and is used to supply power to the sole-
noid pack when the transmission is in normal oper-
ating 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 PCM energizes the relay. Prior to this,
the PCM verifies that the contacts are open by check-
ing 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 ener-
gized, the PCM monitors the terminals to verify that
the voltage is greater than 3 volts.
TRANSAXLE 21 - 149