Fault Tracing Without Microcomputer; Inputs; Outputs - Valtra 6000 Workshop Manual

35. Autocontrol IV
1. Fault tracing without microcom-
puter
(Computer aided trouble shooting, see code 352)
The usual malfunctions are caused by poor contacts in vari-
ous connectors (moisture, impurities etc). The connectors
and their locations are shown on pages 350/8 ---11. External
wires can also damage when the tractor is in use.
Fault tracing of the radar and various sensors, see pages
351/2 ---4. Impurities on the sensors can cause malfunctions.
Fault tracing of the transmission controls, slip control and cold
starting are carried out according to the functional checks on
pages 351/5 ---7.
A possible malfunction can then be localised by measuring
with a multimeter voltages or resistances from the pins of the
ECS connectors A1C (lower) and A2C (upper). Connector
pins have been numbered on the connectors.

Inputs

Input signals for controlling the transmission can be
measured from the connector A2C pins. The connector must
be attached to the ECS. The measurements are carried out
according to the fault tracing tables in instructions under code
352 (computer ---aided trouble shooting) (1=current signal,
0=no signal). Switches and pedals must be in the positions
given in the tables. If no input signal shows, check the switch
in question and its wiring.

Outputs

Output signals for controlling the transmission can be
measured from the pins of connector A1C. Here must also be
used the tables under code 352. If a correct output signal
comes, but the tractor does not function, check a solenoid
valve and an indication light in question and their wirings. If
output signal fails to show, the ECS is faulty. Output signals
into the implement socket, see page 352/9.
Picture 8. Supply voltages
6600E
8100E-- 8750E
1. 1. 1994
ECS
(central processing unit)
If some control function functions in the manual control but
not in the automatic control, the ECS can be damaged.
If the AC IV display unit only flashes and then switches off
when the current is switched on, the ECS is faulty and should
be changed.
If the ECS always uses the default parameter file although a
correct file is input with a microcomputer, the ECS is faulty
and should be changed.
When you measure output signals from the ECS, the lack of
a signal indicates that the ECS is faulty and must be changed.
Supply voltages
--- Switch on current to the tractor
--- If Valmet---name and time appears on the AC IV display, the
unit is in order.
--- If nothing appears on the display, check the AC IV unit fuses
in the fusebox: F30 (10 A) and F24 (10 A).
--- If the fuses are OK, disconnect the ECS upper connector
A2C and measure supply voltages: pin 1 (earth), pin 2 (sup-
ply), pin 21 (supply) and pin 25 (supply).
--- If there are not supply voltages, check supply voltage wir-
ings and connectors.
--- If there are supply voltages, the central unit ECS is faulty or
the display unit is defective.
419
Model Code Page
351 1