Fault Tracing, Front Wheel Drive Control - Valtra 6000 Workshop Manual

34. Autocontrol ---III
In the tables below the marks above the thick line and the
corresponding marks on the PC display should be similar with
the given switch and pedal positions under the thick line.
For these checks it is supposed that the tractor hydraulics and
mechanics are in perfect condition. During the test current is
switched on to the tractor but the engine is stopped (if not
otherwise informed)
A. Fault tracing, front wheel drive control
Input signals to ECS for controlling 4WD (DIGITAL INPUTS).
4WD A/M (A2C/14)
4WD MANUAL 1/0 (A2C/38)
A/M ---SWITCH
ON/OFF ---SWITCH
BRAKE LEFT (A2C/9)
BRAKE RIGHT (A2C/19)
LH SIDE BRAKE PEDAL
RH SIDE BRAKE PEDAL
--- If the marks above the thick lines agree with the corresponding marks on the computer display, the input signals are OK.
--- If the marks on the PC display do not agree with the marks above the thick lines, the fault lies in the switch in question or its
wiring is faulty.
--- Input signals from the radar, front axle sensor and gearbox sensor are checked with a calibrating test, see page 341/1 or accord-
ing to the instruction F on page 342/7.
Output signals from ECS for controlling 4WD (DIGITAL OUTPUTS).
4WD SOLENOID (A1C/38)
4WD LAMP (A1C/35)
4WD A/M
4WD MANUAL 1/0
--- If the marks above the thick line agree with the corresponding marks on the computer display, the possible fault lies in the
solenoid valve, indicating light or their wirings are faulty.
--- If the output signals on the PC display differ from the marks in the table above, the central processing unit (ECS) is faulty and
should be changed.
15. 6. 1992
Important! If the tables below and the computer display
chart do not agree, check first that the cable between the
PC and the AC---III unit is correctly connected to the PC
serial port and to the socket X10C.
The symbols after the names above the thick lines are
connector pins from which possible voltage measurements
can be done. Thus the tables below can be used for trou-
ble shooting even though You don't have a PC.
0 0 1
0 1 0
M M A
OFF ON OFF
0 1
0 0
OFF ON
OFF OFF
1 0
0 1
M M
OFF ON
373
Model Code
6600E, 8100E
1
0
A
ON
0
1
OFF
ON
Page
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