TM 5-2420-230-24-1
3-13. HYDRAULIC CONTROLS ERROR CODES SPECIFICATION.
In the event of a malfunction, the electronic system
performs a self-test and then provides a visual indication
of likely faults to assist with fault diagnosis and
rectification. The self-test checks the condition of all
wiring, detectors, and internal, electronic logic in the
control box.
A visual indication of error codes is given on the
left-hand joystick control by a coded flashing of the
loader indicator lamp (1) and the backhoe indicator
lamp (2). The loader indicator lamp flashes to show the
first digit of the two-digit error code, and the backhoe
indicator lamp flashes to show the second digit. For
example, if error code 48 is being displayed, both lamps
flash four times to indicate first digit is "4," then the
backhoe indicator lamp flashes another four times to
indicate the second digit is "8."
The hydraulic error codes are given in Table 3-3. For
correction of all error codes, refer to TS table (Para 3-16)
or appropriate maintenance task as indicated by the
"LIKELY FAULT" column.
Table 3-3. Hydraulic Error Codes.
DEVICE
LIKELY FAULT
CODE
TYPE
System voltage
Voltage too low
48
1
Voltage too high
1
Controller
Internal fault, diagnostic circuits
91
1
Right joystick wiring
4-in-1 potentiometer shorted to ground
32
2
4-in-1 potentiometer shorted to ground
33
2
Bucket potentiometer shorted to ground
34
2
Bucket potentiometer shorted to ground
35
2
Arms' potentiometer shorted to ground
36
2
Arms' potentiometer shorted to ground
37
2
Left joystick wiring
Swing potentiometer shorted to ground
42
2
Swing potentiometer shorted to ground
43
2
Dipper potentiometer shorted to ground
44
2
Dipper potentiometer shorted to ground
45
2
Load-holding valve solenoid
No connected load
51
2
Float valve section B
No connected load
52
2
Float valve section A
No connected load
53
2
Boom sensor wiring
Signal shorted to ground
12
3
Signal shorted to power
13
3
