Chrysler PT Cruiser 2001 Service Manual Supplement page 2764

GENERAL INFORMATION
– After replacement or rebuild of internal trans-
mission components or the torque converter.
– If one or more of the clutch volume 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 erroneous
clutch volume values, which could cause poor
initial shift quality.
– 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 indi-
cates the procedure is complete.
– The oil temperature must be between 60-
200°F.
NOTE: THE ABOVE CONDITIONS MUST BE
MAINTAINED DURING THE PROCEDURE TO
KEEP THE PROCEDURE
ABORTED.
The Quick Learn procedure is performed with the
DRBIII by selecting ''Transmission'' system then
''Miscellaneous'' functions, then ''Quick Learn''. Fol-
low the procedure instructions displayed on the
DRBIII .
3.3.9 CLUTCH VOLUMES
The L-R clutch volume is updated when doing a
2-1 or 3-1 coast down shift. The transmission tem-
perature must be between 70-120°F. The clutch
volume should be between 35 and 83.
The 2-4 clutch volume is updated when doing a
1-2 shift. The transmission temperature must be
above 110°F. The clutch volume should be between
20 and 77.
The OD clutch volume is updated when doing a
2-3 shift. The transmission temperature must be
above 110°F. The clutch volume should be between
40 and 150.
The UD clutch volume is updated when doing a
4-3 or 4-2 shift. The transmission temperature must
be above 110°F. The clutch volume should be be-
tween 24 and 70.
3.3.10 ELECTRONIC PINION FACTOR
The transmission output speed signal supplies
distance pulses to the powertrain control module
(PCM), which are used to calculate speed and
mileage. A pinion factor is stored in the transmis-
sion control module (TCM) in order to provide the
appropriate distance pulses for the vehicle. The
pinion factor is programmed into the TCM at the
assembly plant.
Using the following steps, the pinion factor can be
checked and/or reset using the DRBIII :
1. Select ''Transmission'' system, then ''Miscella-
2. If the tire size is incorrect, depress the Enter key
3. Depress the Page Back key to exit the reset
Notes about Electronic Pinion Factor Features
The nature of the electronic pinion factor requires
that certain features must be taken into consider-
ation.
> If no pinion factor is stored in an installed TCM,
the vehicle speedometer will not operate, engine
speed will be limited to 2300 RPM, and catalyst
damage may occur.
> If a TCM is removed from one vehicle and placed
FROM BEING
in another, the pinion factor must be re-
programmed according to the new vehicle's final
drive ratio (FDR) and tire size.
Note: Swapping of production TCM's is not a
recommended procedure.
> Selecting a wrong FDR or tire size will cause the
speedometer to be inaccurate and will also cause
any speed related features to operate improperly.
3.4 USING THE DRBIII
Refer to the DRBIII user's guide for instructions
and assistance with reading trouble codes, erasing
trouble codes, and other DRBIII functions.
3.5 DRBIII ERROR MESSAGES
Under normal operation, the DRBIII will dis-
play one of only two error messages:
If the DRBIII
message, record the entire display and call the
MDS2 Hotline. This is a sample of such an error
message display:
16
neous'' functions, then ''Pinion Factor''. The
DRBIII will display the current tire size.
and then select the correct size.
procedure.
– User-Requested WARM Boot
– User-Requested COLD Boot
should display any other error