(1) Attach gauge to the torque converter clutch off
pressure tap.
(2) Move selector lever to the overdrive position.
(3) Allow vehicle wheels to turn and increase
throttle opening to achieve an indicated vehicle speed
of 50 mph. Vehicle should be in 4th gear, CC on.
CAUTION: Both wheels must turn at the same
speed.
(4) Torque converter clutch off pressure should be
less than 5 psi.
(5) Now attach the gauge to the torque converter
clutch on pressure tap.
(6) Move selector to the overdrive position.
(7) Allow vehicle wheels to turn and increase
throttle opening to achieve an indicated vehicle speed
of 50 mph.
(8) Verify the torque converter clutch is applied
mode using the RPM display of the DRB scan tool.
(9) Torque converter clutch on pressure should be
60-90 psi.
TEST SIX-SELECTOR IN REVERSE
NOTE: This test checks the reverse clutch hydraulic
circuit.
(1) Attach gauge to the reverse and low/reverse
clutch tap.
(2) Move selector lever to the reverse position.
(3) Read reverse clutch pressure with output sta-
tionary (foot on brake) and throttle opened to achieve
1500 rpm.
(4) Reverse and low/reverse clutch pressure should
read 165 to 235 psi.
TEST RESULT INDICATIONS
(1) If proper line pressure is found in any one test,
the pump and pressure regulator are working prop-
erly.
(2) Low pressure in all positions indicates a defec-
tive pump, a clogged filter, or a stuck pressure regu-
lator valve.
(3) Clutch circuit leaks are indicated if pressures
do not fall within the specified pressure range.
(4) If the overdrive clutch pressure is greater than
5 psi in Step 6 of Test Three, a worn reaction shaft
seal ring or a defective solenoid assembly is indi-
cated.
(5) If the underdrive clutch pressure is greater
than 5 psi in Step 4 of Test Two-A, a defective sole-
noid/pressure switch assembly or controller is the
cause.
ALL PRESSURE SPECIFICATIONS ARE PSI (ON HOIST, WITH FRONT WHEELS FREE TO TURN)
Gear Selector
Position
Actual Gear PRESSURE TAPS
Under-
drive
Clutch
Over-
drive
Clutch
Reverse
Clutch
Torque
Con-
verter
Clutch
Off
Torque
Con-
verter
Clutch
On
2/4
Clutch
Low/
Reverse
Clutch
PARK
0 mph
* PARK 0-2 0-5 0-2 60-
110
45-
100
0-2 115-145
REVERSE
0 mph
* REVERSE 0-2 0-7 165-235 50-
100
35-85 0-2 165-235
NEUTRAL
0 mph
* NEUTRAL 0-2 0-5 0-2 60-
110
45-
100
0-2 115-145
L
20 mph
# FIRST 110-145 0-5 0-2 60-
110
45-
100
0-2 115-145
3
30 mph
# SECOND 110-145 0-5 0-2 60-
110
45-
100
115-145 0-2
3
45 mph
# DIRECT 75-95 75-95 0-2 60-90 45-80 0-2 0-2
OD
30 mph
# OVERDRIVE 0-2 75-95 0-2 60-90 45-80 75-95 0-2
OD
50 mph
# OVERDRIVE
WITH TCC
0-2 75-95 0-2 0-5 60-95 75-95 0-2
* Engine Speed at 1500 rpm
# CAUTION: Both front wheels must be turning at same speed.
LH TRANSAXLE 21 - 7
42LE AUTOMATIC TRANSAXLE (Continued)
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