Chrysler 2000 LHS Owner's Manual page 1189

21 - 20 42LE TRANSAXLE
DESCRIPTION AND OPERATION (Continued)
AUTOMATIC SHIFTS WILL OCCUR UNDER THE FOLLOWING CONDITIONS
TYPE OF SHIFT
4-3 coast downshift
3-2 coast downshift
2-1 coast downshift
1-2 upshift
2-3 upshift
4-3 kickdown shift
MANUAL SHIFTS ARE NOT PERMITTED UNDER THE FOLLOWING CONDITIONS
TYPE OF SHIFT
3-2 downshift
2-1 downshift
DIAGNOSIS AND TESTING
42LE GENERAL DIAGNOSIS
CAUTION: Before attempting any repair on the
42LE Four Speed Automatic Transaxle, always
check for proper shift linkage adjustment. Also
check for diagnostic trouble codes with the DRB
scan tool and the 42LE Transaxle Diagnostic Proce-
dure Manual.
42LE automatic transaxle malfunctions may be
caused by these general conditions:
• Poor engine performance
• Improper adjustments
• Hydraulic malfunctions
• Mechanical malfunctions
• Electronic malfunctions
When diagnosing a problem always begin with
recording the complaint. The complaint should be
defined as specific as possible. Include the following
checks:
• Temperature at occurrence (cold, hot, both)
• Dynamic conditions (acceleration, deceleration,
upshift, cornering)
• Elements in use when condition occurs (what
gear is transaxle in during condition)
• Road and weather conditions
• Any other useful diagnostic information.
After noting all conditions, check the easily acces-
sible variables:
13-47 mph w/sufficient throttle
3-4 upshift
APPROXIMATE SHIFT POINT
2.7L / 3.2 L
13 mph
9 mph
5 mph
6300 engine rpm
6300 engine rpm
APPROXIMATE SHIFT POINT
Above 74 mph @ closed throttle or 70 mph otherwise
Above 41 mph @ closed throttle or 38 mph otherwise
• Fluid level and condition
• Shift linkage adjustment
• Diagnostic trouble code inspection
Then perform a road test to determine if the prob-
lem has been corrected or that more diagnosis is nec-
essary. If the problem exists after the preliminary
tests and corrections are completed, hydraulic pres-
sure checks should be performed.
ROAD TEST
Prior to performing a road test, verify that the
fluid level, fluid condition, and linkage adjustment
have been approved.
During the road test, the transaxle should be oper-
ated in each position to check for slipping and any
variation in shifting.
If the vehicle operates properly at highway speeds,
but has poor acceleration, the converter stator over-
running clutch may be slipping. If acceleration is nor-
mal, but high throttle opening is needed to maintain
highway speeds, the converter stator clutch may
have seized. Both of these stator defects require
replacement of the torque converter and thorough
transaxle cleaning.
Slipping clutches can be isolated by comparing the
"Elements in Use" chart with clutch operation
encountered on a road test. This chart identifies
which clutches are applied at each position of the
selector lever.
A slipping clutch may also set a DTC and can be
determined by operating the transaxle in all selector
positions.
3.5L
13 mph
9 mph
5 mph
6600 engine rpm
6600 engine rpm
13-47 mph w/sufficient throttle
Below 15 mph
LH