Chrysler 300M 2002 Service Manual page 2808

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, there-
fore: there are many possible combinations of open
and closed switches (codes). However, 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.
The following are DRBIII reported Shift
Lever Error coes (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
indicate "OD" until the shifter is shifted into the
"OD" position and held for at least 3 seconds.
GENERAL INFORMATION
> Worn Manual Lever (Rooster Comb). Check for
heavy wearing by TRS switch contacts
> Intermittent C1 through C4 (T1, T3, T41 or T42)
circuits. Check for corrosion, terminal push-outs
or spread terminals at PCM and/or TRS connec-
tor
> TRS
> PCM
> BCM
Scenario 3) - If an invalid code happens while
operating in the "3" or "L" position, the "3" or "L"
shift schedule and electronic display will be frozen
(regardless of whether "OD"', "3" or "L" is selected).
The display will be frozen until the shifter is moved
to the "N" position (all PRNDL lights will illumi-
nate) and then back to the "OD" position. The "N"
and "OD" position must be held there for at least 3
seconds in each position to resume the normal
"OD" shift schedule and electronic display.
> Intermittent C1 through C4 (T1, T3, T41 or T42)
circuits. Check for corrosion, terminal push-outs
or spread terminals at PCM and/or TRS connec-
tor.
> TRS
> PCM
> BCM
These same symptoms may occur without the code
P0706(28) setting. It is possible that the invalid
code that was sensed by the PCM only occurred
once or twice during the given ignition key start
and/or did not last for longer than 0.1 second.
Name of code: P0120(29) - Throttle Position Sen-
sor Signal Circuit
When monitored: Whenever the engine is run-
ning.
Set condition: This code is set if the throttle angle
goes out of range or if throttle angle changes
abruptly (ie: faster than the throttle body motion
could occur). The DTC will be set if the engine
supplied calculated throttle angle or a fixed 25
degrees of throttle angle is substituted for use by
the Transmission control system.
Theory of operation: The PCM receives the
throttle position signal from the Throttle Position
Sensor (TPS). The PCM uses a new dual port RAM
internal to the controller to send the TPS signal to
the Transmission Control System. The TPS has a
5-volt pull up supplied from the Powertrain Con-
trol Module (PCM). The signal is checked for out-
of-range and intermittent operation (excessive sig-
nal changes). If the TPS signal is unavailable, the
transmission will use a calculated throttle angle
supplied by the engine control system. If the Trans-
mission Control System has an internal error
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