Chrysler PT Cruiser 2001 Service Manual Supplement page 1242

PT
DESCRIPTION AND OPERATION (Continued)
The TCM is the heart of the electronic control sys-
tem and relies on information from various direct
and indirect inputs (sensors, switches, etc.) to deter-
mine driver demand and vehicle operating condi-
tions. With this information, the TCM can calculate
and perform timely and quality shifts through vari-
ous output or control devices (solenoid pack, trans-
mission control relay, etc.).
The TCM also performs certain self-diagnostic
functions and provides comprehensive information
(sensor data, DTC's, etc.) which is helpful in proper
diagnosis and repair. This information can be viewed
with the DRB scan tool.
TRANSAXLE IDENTIFICATION
The 41TE transaxle identification code is a series
of digits printed on a bar-code label that is fixed to
the transaxle case as shown in (Fig. 2).
For example, the identification code K 821 1125
1316 can be broken down as follows:
• K = Kokomo Transmission Plant
• 821 = Last three digits of the transaxle part
number
• 1125 = Build date
• 1316 = Build sequence number
Fig. 2 Transaxle Identification Label
1 – IDENTIFICATION TAG
If the tag is not legible or missing, the "PK" num-
ber, which is stamped into the transaxle case behind
the transfer gear cover, can be referred to for identi-
fication. This number differs slightly in that it con-
tains the entire transaxle part number, rather than
the last three digits.
OPERATION
Transmission output is directed to an integral dif-
ferential by a transfer gear system in the following
input-to-output ratios:
First . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.84 : 1
Second . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.57 : 1
Third . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.00 : 1
Overdrive . . . . . . . . . . . . . . . . . . . . . . . . . . 0.69 : 1
Reverse . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.21 : 1
Final Drive Ratio (FDR) is dependent on which
engine option is selected:
2.0L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.07 FDR
2.4L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.91 FDR
FLUID
NOTE: Refer to the maintenance schedules in
LUBRICATION AND MAINTENANCE for the recom-
mended maintenance (fluid/filter change) intervals
for this transaxle.
NOTE: Refer to Service Procedures for fluid level
checking procedures.
NOTE: The transmission and differential sump have a
common oil sump with an opening between the two.
DESCRIPTION
Mopar ATF+4 (Automatic Transmission Fluid-
Type 9602) is required in this transaxle. Substitute
fluids can induce torque converter clutch shudder.
Mopar ATF+4 (Automatic Transmission Fluid-
Type 9602) when new is red in color. The ATF is dyed
red so it can be identified from other fluids used in
the vehicle such as engine oil or antifreeze. The red
color is not permanent and is not an indicator of fluid
condition. As the vehicle is driven, the ATF will begin
to look darker in color and may eventually become
brown. This is normal. A dark brown/black fluid
accompanied with a burnt odor and/or deterioration
in shift quality may indicate fluid deterioration or
transmission component failure.
FLUID ADDITIVES
DaimlerChrysler strongly recommends against the
addition of any fluids to the transmission, other than
those automatic transmission fluids listed above.
Exceptions to this policy are the use of special dyes
to aid in detecting fluid leaks.
Various "special" additives and supplements exist
that claim to improve shift feel and/or quality. These
additives and others also claim to improve converter
clutch operation and inhibit overheating, oxidation, var-
nish, and sludge. These claims have not been supported
to the satisfaction of DaimlerChrysler and these addi-
tives must not be used. The use of transmission
"sealers" should also be avoided, since they may
adversely affect the integrity of transmission seals.
TRANSAXLE 21 - 57