Lull 944E-42 Service Manual User Manual
Page 735
9.225
Model 644E-42/944E-42
Rev. 6/04
Electrical System
If the transmission is not shifting properly, the
transmission shift control switch/travel select lever (1),
dash panel, wiring harness or transmission shift
solenoids should be checked in order to determine which
component is defective. Specific information to determine
which travel position and corresponding component is not
responding can be found by referring to Section 9.9.1,
“Transmission, Forward - First Gear Circuit,” and
subsequent circuits and troubleshooting charts. Replace
a defective component.
a. Travel Select Lever and Wiring Harness Testing
Note: An assistant will be required to be seated and
operate the travel select lever in order to perform the
following test.
1. Disconnect the wire harness connector plugs (12)
from all of the transmission solenoid valve
bodies (13). Turn the ignition switch to the
RUN position.
Note: In order to perform the solenoid test, the Parking
Brake Switch must be in the OFF position.
2. Have an assistant place the transmission shift
control switch/travel select lever (1) in the position
that is not functioning correctly.
3. Check the harness side connector plugs on the
active solenoids corresponding to the direction and
gear that has been selected with a DMM for battery
voltage. Refer to the chart that follows. Place the
negative (-) lead on pin B (ground) (14) and the
positive (+) lead on the pin A (15), and test for
battery voltage. If battery voltage is not present on
any of the pins that have been tested, the wiring
harness is suspect and should be replaced. If
battery voltage is present, the harness is functioning
properly.
Note: The following chart shows which solenoids are
active with any given selection of the transmission shift
control switch/travel select lever (1), and gear select
position.
b. Transmission Solenoid Testing
Inspect each solenoid connector plug (16). Test across
the two pins inside the connector for continuity and
shorting. Each solenoid should have between 10.0 and
15.0 ohms of resistance when testing with an ohmmeter.
Replace a defective solenoid valve. Refer to Section
9.14.9, c. “Transmission Solenoid Valve Removal.”
MU3940
12
13
14
15
16
Solenoid Valve
Y1
Y2
Y3
Y4
Y5
Y6
Callout
(7)
(9)
Driving
Direction
Speed
Forward
First
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Forward
Second
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Forward
Third
•
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Forward
Fourth
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•
Reverse
First
•
•
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•
Reverse
Second
•
•
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•
Reverse
Third
•
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