Lull 944E-42 Service Manual User Manual download pdf (Page 735)

100

101

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

Solenoid Valve Y1Y2Y3Y4 Y5 Y6

Callout (6) (7) (8) (9) (10) (11)

Driving

Direction

Speed

Forward First ••• •

Forward Second •• ••

Forward Third •• •

Forward Fourth ••

Reverse First ••• •

Reverse Second •• • •

Reverse Third •• •

1 2 ... 730 731 732 733 734 735 736 737 738 739 740 ... 845 846

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Lull 944E-42 Service Manual User Manual Page 735

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