Chrysler PT Cruiser 2001 Service Manual Supplement page 1257

21 - 72 TRANSAXLE
DIAGNOSIS AND TESTING (Continued)
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.
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.
HYDRAULIC PRESSURE TESTS
Pressure testing is a very important step in the
diagnostic procedure. These tests usually reveal the
cause of most hydraulic 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.).
Install an engine tachometer, raise vehicle on hoist
which allows front wheels to turn, and position
tachometer so it can be read.
INPUT CLUTCHES
Overdrive
X
X
X X
X
X
X
X X
X
X
X X
A slipping clutch may also set a DTC and can be
determined by operating the transaxle in all selector
positions.
Reverse
X
Attach 300 psi gauge (C-3293SP) to port(s)
required for test(s) being conducted. Use adapter set
L-4559 to adapt gauge(s) to transaxle.
Test port locations are shown in (Fig. 26).
TEST ONE-SELECTOR IN LOW (1st GEAR)
(1) Attach pressure gauge to the low/reverse clutch
tap.
(2) Move selector lever to the (L) position.
(3) Allow vehicle wheels to turn and increase
throttle opening to achieve an indicated vehicle speed
to 20 mph.
(4) Low/reverse clutch pressure should read 115 to
145 psi.
(5) This test checks pump output, pressure regula-
tion and condition of the low/reverse clutch hydraulic
circuit and shift schedule.
HOLDING CLUTCHES
2/4 Low/Reverse
X
X
X
X
X
X
X
X
X
X
PT