Function Of Diagnostic Light And Fault Codes; Faul Codes Of Acd Power Lift; Serious Faults - Valtra 6000 Workshop Manual

32. ACB / ACD electro---hydraulic power lift
C. Function of diagnostic light and fault codes (ACB and ACD)
When the current is switched on with an ignition switch, the diagnostic light is lit for a while (book symbol). This is the self ---
testing of the ACD system. After a short time the diagnostic light is lit continuously. This indicates that the power lift is locked.
When the light is on, all functions are locked, but the push buttons function.
The power lift is activated by turning the lift/lower switch first to the lifting and then to the lowering position, at which time the
diagnostic light goes out and the power lift responds to all switches. Immediately after the activating the ACD limits the supply
current to the solenoid valves for safety. This limit delays movements of the lower links. The current supply limit disappears,
when the function limit of the control unit has been achieved or if the lift/lower switch is used anew.
After use of the push buttons the ACD is locked and the diagnostic light is illuminated.
Fault codes
ACD power lift continually monitors possible malfunctions in the system. The faults are divided into three different levels
according to their seriousness as follows:

1. Serious faults:

--- the power lift is locked
--- relay closes (protects outputs)
--- diagnostic light indicates the fault
--- Remedy: Repair the fault, start the tractor and activate the power lift.
2. Medium serious faults:
--- the power lift is locked.
--- diagnostic light indicates the fault
--- Remedy: Repair the fault and activate the power lift with the lift/lower switch
3. Minor faults
--- the power lift continually functions
--- diagnostic light indicates the fault. When the lift/lower switch is turned, the diagnostic light goes out, if the fault has disap-
peared.
A possible fault can be localised with the aid of the diagnostic light, which displays by flashing the number of the fault code.
For example, if the signal wire to the draft control selector is damaged or there is poor contacts in connectors (fault code 36),
the diagnostic lights flashes as follows:
--- Long pause --- three flashes --- short pause --- six flashes.
During momentary faults, the diagnostic light flashes, until the lift/lower switch is turned, although the fault has already disap-
peared.

Faul codes of ACD power lift

1. Serious faults
Fault code Fault
number
11 Output/lifting
12 Output lowering
13 Short circuit
14 Open circuit
15 Push buttons
16 Supply
17 Battery
18 Lift/lower switch
Control Description
unit con-
nector pin
37 Output signal to lifting solenoid faulty or poor contacts in solenoid wire
to pin 35. Battery voltage low in pin 29 (fuse fault).
19 Output signal to lowering solenoid faulty or poor contacts in solenoid
wire to pin 35. Battery voltage low in pin 29 (fuse fault).
35 Measured current in pin 35 too high. Short circuit between pins 19
and 35 or between pins 37 and 35 (solenoid in short circuit)
35 No current in pin 35, altought solenoid is activated. Possible poor
contacts in wires to solenoid (pins 19, 37 ja 35). Solenoid damaged.
No battery voltage in pin 29 (fuse fault)
9 Signal from push buttons not OK. Push button or its wire damaged.
2 (+) Control unit supply not in order.
20 (---) Supply of 9,5 V and earthing not in order
29 Battery voltage greater than 18 V
21 Signal from switch faulty. Poor contacts or signal wire not connected.
305
Model
15. 5. 1996
8450-- 8750
1. 11. 1998
Code Page
321 3