Chrysler Concorde 2004 Service Manual page 1169

Theory of operation: The Transmission system
uses three pressure switches to monitor the fluid
pressure in the LR, 2/4, and OD elements. The
pressure switches are continuously monitored for
the correct states in each gear as shown below.
Transmission Effects: If a set condition is iden-
tified, 1st gear and torque converter lock-up
(EMCC) will be inhibited. The vehicle will launch
in 2nd gear and shift normally through the gears
without allowing EMCC. If during the same key
start, the set condition is no longer valid, the
transmission will return to normal operation (1st
and EMCC available). Limp-in will not occur un-
less code P0841(24) is accompanied by a code
P0706(28) and the MIL will illuminate after 5
minutes of substituted operation.
Possible causes:
> If code P0944(35) is present, ignore code
P0841(24) and perform code P0944(35) diag-
nostic procedures
> LR pressure switch sense circuit open or
shorted to ground between PCM and solenoid
pack
> LR pressure switch sense circuit shorted to
battery
> Solenoid pack
> Valve body - solenoid switch valve stuck in
LU position. May be accompanied by a code
P1775(37)
> Loose valve body bolts
> Plugged filter - internal transmission or
torque converter failure
> PCM
Name of code: P0706(28) - Check Shifter Signal
When Monitored: Continuously with the key on.
Set Condition: 3 occurrences in one key start of
an invalid PRNDL code which lasts for more than
0.1 second.
Theory of Operation: The C1 through C4 (T1,
T3, T41, and T42) sense circuits communicate the
shift lever position to the PCM. Each circuit is
terminated at the transmission with a switch.
Each switch can be either open or closed, depend-
GENERAL INFORMATION
ing on the shift lever position. The PCM can decode
this information and determine the shift lever
position. Each shift lever position has a certain
combination of switches which will be open and
closed, this is called a PRNDL code. There are 4
switches, therefore: there are many possible com-
binations of open and closed switches (codes). How-
ever, there are only 9 valid codes (8 for AutoStick),
one for each gear position and three recognized
between gear codes. The remainder of the codes
should never occur, these are called invalid codes.
The following chart shows the normal switch states
for each shift lever position.
TRS Park T1 Rev T2
T1 (C4) OP OP OP CL
T3 (C3) CL CL OP OP OP OP OP CL
T41 (C1) CL OP OP OP CL
T42 (C2) CL CL CL
The following are DRBIII reported Shift Le-
ver Error Codes (chart)
Transmission Effects and possible causes:
Scenario 1) - All PRNDL lights stay illuminated
indefinitely in Park following a Key start.
> Wrong Part Number PCM for application
> TRS connector not plugged in
> C1 through C4 (T1, T3, T41, or T42) circuits are
open, shorted to ground, or shorted to 12 volts.
> PCI bus failure (Open or shorted resulting in no
communication to BCM or Cluster)
> TRS
> PCM
> BCM
Scenario 2) - "P" is indicated following a key start
but all PRNDL lights illuminate in "N" following a
shift from "R" to "N". If PRNDL lights illuminate in
"N" and shifter is moved directly into "3" or "L"
position without pausing in "OD", then the "OD"
position shift schedule and electronic display will
9
N T2 OD T3 3/AS T3
CL CL CL CL OP CL
CL CL
OP OP OP OP OP OP
CL CL CL OP OP OP OP CL
L
CL
CL