GROUSER G. 2B3479 - Caterpillar

If the machine has been calibrated successfully and has operated without problems, these codes indicate a controller failure.However, if one of these codes has been displayed immediately after calibrating a control box from an unknown state, incorrect controller values may have been recorded due to the controller or pushbuttons not being operated to their full travel. This creates an error display when, in normal operation, the control is moved past the point recorded during calibration.In this case the controller calibration should be repeated taking care that the controller and pushbuttons are operated to full travel at the relevant times.If there is a definite fault then the causes could be:-1. A short to ground or a broken connection in the wiring harness between the controller and the control box. This could be a broken pin in a sureseal connector for example or wire insulation cut through by a sharp edge. Check the wiring associated with the failing axis (the fault code will indicate which wire to check). Make up a break out cable using male and female sureseal connectors wired to a terminal strip to check the controller and main harness. This will allow measurement of voltages to and from the control box.Typical voltages that can be expected at the sureseal connector pins are shown in the chart. Loss of reference voltage due a faulty thermistor can cause a misleading display of codes 11, 13, 15 and 17 on early machines. See code C0.2. A faulty boom and attachment controller. Replace the controller and re-calibrate the control box.3. A faulty control box. Replace the control box and re-calibrate. Codes 18, 19, 20, 21, 24 and 25 will be displayed only on machines equipped for auto height/auto reach operation and indicate a problem with the sensor wiring/connections or the sensor. Typical voltages and fault finding techniques are the same as the controller. For example, the reference voltage should be 4.95 - 5.05V and the signal out should be in the range 0.5 to 4.75V. Refer to the machine electrical schematic for pin connection numbers. Codes 28 and 29 refer to the temperature sensor (thermistor) located in the directional control valve. Failure of this component can disable the machine control system by shorting the reference voltage to ground, or change the performance as the hydraulic oil warms up. The sensor should measure around 10K ohms at 25 deg C. See Code C0. Codes 30 and 31 refer to the circuitry which monitors the machine battery voltage. This is located in the control box, which should therefore be replaced. The only exception is if a 12 Volt machine is being powered or jump started from 24 Volts by mistake. Codes 40 and 41 will be displayed only on machines equipped for auto height/auto reach operation and indicate a problem with the chassis angle sensor. This should be checked for a bad connection or faulty sensor. Codes 50 through 53 are caused by the controller being moved in the wrong direction during