POWER TRAIN AR 3843772 - Caterpillar

Illustration 1 g00296905
Caterpillar Monitoring System
(1) Quad gauge module. (2) Speedometer/tachometer module. (3) Main display module. (4) Alert indicators. (5) Gauges. (6) Tachometer gauge. (7) Speed readout. (8) Transmission gear readout. (9) Display area.
The self test verifies that the main display module and the display modules are operating properly. The main display module performs an automatic self test when the key start switch is turned from the OFF position to the ON position. The internal circuits and the outputs (displays, action lamp and action alarm) are automatically checked. The operator must observe the outputs in order to determine if the modules and the outputs are operating properly. The alert indicators and the display area are tested for approximately one second:
All alert indicators (4) FLASH.
Display area (9) shows: unit indicators, "SERV CODE" indicator, symbol for service meter and "888.X.8.8" on the six digit display area.The display modules are tested for approximately three seconds:
The test for the LCD segments for rpm, gear and direction (8) will turn on every segment of the display. The readout looks like a "0" with an "X" and a "+". There should be twelve of these symbols next to each other on the lamp/gear module.
The alert indicators (3) and the mode indicators (7) for the lamp/gear module will turn ON.
Tachometer gauge (6) and gauges (5) jump to half scale. The gauges go to zero. The gauges then go to full scale. After reaching full scale, the tachometer and the gauges return to the current machine values.
The actual transmission gear readout (8) turns on every segment of the readout. The readout looks like a "0" with an "X" and a "+". There should be two of these symbols next to each other.
Ground speed readout (7) turns on every segment of the readout. The readout looks like "188". "MPH" and "km/h" are both turned ON.
The action lamp turns ON.
The action alarm SOUNDS once.The main display module then goes into the normal mode of operation. The main display module can also scroll through the modes if the inputs to the operator switch, the service switch or the clear switch are grounded. The module is operating properly if the main display module operates, as described. There is a problem with the harness code or the module has failed if the main display module does not operate, as described. In order to check the harness code, see Troubleshooting, " Harness Code ".