MANIFOLD 4W4384 - Caterpillar

Illustration 1 g03387071
Actual gear indicator circuit
The components of the actual gear indicator circuit are the:
Power Train Electronic Control Module (ECM)
Caterpillar Monitoring System ECM
Speedometer/tachometer module
Autoshift control switch
Transmission control
Transmission solenoids
Illustration 2 g01145165
Cab
(1) Power Train ECM
Illustration 3 g03392320
Cab
(2) Caterpillar Monitoring System ECM (behind display)
Illustration 4 g03395111
Cab
(3) Speedometer/tachometer module
(4) Actual gear indicator With the key start switch in the ON position, 24 V power is supplied via: circuit breaker #9 to Power Train ECM (1), circuit breaker #1 to Caterpillar Monitoring System ECM (2) and to speedometer/tachometer module (3).
Illustration 5 g03392321
Dash panel
(5) Autoshift control switch
(6) MANUAL position
(7) AUTOMATIC position
Illustration 6 g03392323
Cab
(8) Transmission control
(9) Upshift switch
(10) Downshift switch
(11) Transmission direction control switch When autoshift control switch (5) is in MANUAL position (6), Power Train ECM (1) receives a signal from transmission direction control switch (11) for the direction that is currently selected. Upshift switch (9) and downshift switch (10) determine the gears that are currently selected. The signal is sent to Caterpillar Monitoring System ECM (2) via the CAT Data Link and sent to speedometer/tachometer module (3). speedometer/tachometer module (3) will display the actual gear in the display window. Actual gear indicator (4) displays the gear that is currently selected by Power Train ECM (1). Power Train ECM (1) will energize transmission solenoids as required.When the autoshift control switch is in AUTOMATIC position (7), Power Train ECM (1) receives a signal from transmission direction control switch (11) for the direction that is currently selected. Power Train ECM (1) will change gears within the transmission automatically. The gear that is currently selected in the AUTOMATIC position, will be displayed on actual gear indicator (4).Reference: For more information on the actual gear indicator system refer to Systems Operation, Testing, and Adjusting, "Caterpillar Monitoring System".