Chrysler 300M 2002 Service Manual page 2816

Name of code: P0562(79) Low Battery Voltage
When monitored: Continuously with engine run-
ning and Transmission Relay energized.
Set condition: If the battery voltage of the Trans-
mission Control Relay Output Sense circuit(s) to
the PCM is less than 10.0 volts for the period of 15
seconds. The DTC will also set if the direct battery
voltage sensed in the PCM is less than 6.5v for
200ms or where Transmission Control Relay Out-
put Sense circuit (switched battery) is less than
7.2v for 200ms. Note: P0562 generally indicates a
gradually falling battery voltage or a resistive
connection(s) to the PCM.
Theory of operation: The Transmission system
requires sufficient battery voltage in order to ener-
gize the transmission solenoids. The TCM contin-
uously monitors the voltage available to the sole-
noids.
Transmission effects: At speeds above 72 Km/h
(45 MPH) the transmission system will default to
neutral. Below 72 Km/h (45 MPH) the transmis-
sion system will default to Limp-in mode and the
MIL will illuminate after 5 minutes of substituted
operation. Manual gear selection of Park, Reverse,
Neutral and Second will be available.
Possible causes:
> Charging system problem
> Poor/High resistance connection between PCM
and Battery/Alternator
> PCM high resistance or poor connection
> PCM ground high resistance or poor connection
> High resistance in Transmission Control Relay
contacts
> PCM
3.3.8 QUICK LEARN
The Quick Learn function customizes adaptive
parameters of the PCM to the transmission char-
acteristics of a vehicle. This gives the customer
improved "as received" shift quality compared to
the initial parameters stored in the PCM.
Notes about Quick Learn Features
The nature of the Quick Learn function requires
that certain features must be taken into consider-
ation.
> Quick Learn should generally not be used as
a repair procedure unless directed by a repair
or diagnostic procedure. If the transmission
system is exhibiting a problem that you think
is caused by an invalid CVI, you should try to
relearn the value by performing the appropri-
ate driving maneuvers. In most cases, if a
quick learn makes a vehicle shift better, the
vehicle will return with the same problem.
GENERAL INFORMATION
> Before performing Quick Learn, it is impera-
tive that the vehicle be shifted into OD with
the engine running and the oil level set to the
correct level. This step will purge air from the
clutch circuits to prevent erroneous clutch
volume values which could cause poor initial
shift quality.
> If an unused PCM is installed on a vehicle
with a HOT engine, Quick Learn will cause
the PCM to report a cold calculated oil tem-
perature. This requires monitoring the calcu-
lated oil temperature using the DRBIII . If
the temperature is below 15°C (60°F), the
transmission must be run at idle or driven in
gear until it goes above 15°C (60°F). If the
temperature is above 93°C (200°F), the trans-
mission must cool to below 93°C (200°F).
> First gear is engaged in overdrive after Quick
Learn is completed. Place the vehicle in park
after performing Quick Learn.
The Quick Learn function should be performed:
– Upon installation of a new service PCM
– After replacement or rebuild of internal trans-
mission components or the torque converter
– If one or more of the clutch volumes indexes
(CVI's) contain skewed readings because of
abnormal conditions.
To perform the Quick Learn procedure, the follow-
ing conditions must be met.
– It is imperative that the vehicle be shifted into
OD with the engine running and the oil level
set to the correct level. This step will purge
the air in the clutch circuits to prevent erro-
neous clutch volume values, which could
cause poor initial shift quality.
– Place the selector lever in neutral.
– The brakes must be applied.
– The engine must be idling.
– The throttle angle (TP sensor) must be less
than 3 degrees.
– The shift lever position must stay in neutral
until prompted to shift into OD.
– The shift lever must stay in OD after the
"Shift to Overdrive" prompt until the DRBIII
indicates the procedure is complete.
– The oil temperature must be between 15°C
(60°F) and 93°C (200°F).
NOTE: The above conditions must be
maintained during the procedure to keep the
procedure from being aborted.
The Quick Learn procedure is performed with
the DRBIII by selecting "Transmission" system
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