Diagnosis And Testing - Hydraulic - Dodge Intrepid Service Manual

LH
42LE AUTOMATIC TRANSAXLE (Continued)
• 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.
DIAGNOSIS AND TESTING - 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-
ELEMENTS IN USE AT EACH POSITION OF SELECTOR LEVER
Shift Lever
Position
Underdrive
P - PARK
R - REVERSE
N - NEUTRAL
OD -
OVERDRIVE
First
Second
Direct
Overdrive
D - DRIVE*
First
Second
Direct
L - LOW*
First
Second
Direct
* Vehicle upshift and downshift speeds are increased when in these selector positions.
The process of elimination can be used to detect
any unit which slips and to confirm proper operation
of good units. Road test analysis can diagnose slip-
ping units, but the cause of the malfunction cannot
be determined. Practically any condition can be
caused by leaking hydraulic circuits or sticking
valves.
INPUT CLUTCHES
Overdrive
X
X
X X
X
X
X
X X
X
X
X X
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.
Reverse
X

DIAGNOSIS AND TESTING - HYDRAULIC

PRESSURE TESTS
Pressure testing is a very important step in the
diagnostic procedure. These tests usually reveal the
cause of most transaxle problems.
Before performing pressure tests, be certain that
fluid level and condition, and shift cable adjustments
have been checked and approved. Fluid must be at
operating temperature (150 to 200 degrees F.).
TRANSAXLE 21 - 5
HOLDING CLUTCHES
2/4 Low/Reverse
X
X
X
X
X
X
X
X
X
X