Reconditioning Temperature Sensors; Clutch Pedal Position Sensor B16 And B1W (Twintrac); Gearbox Oil Temperature Sensor; Outdoor Temperature B17 - Valtra 6000 Workshop Manual

37. Autocontrol 5.2 (K41107---)

4. Components

A. Reconditioning temperature sensors

1. Gearbox oil temperature sensor

X13, X19
Note! Sensor B14 (A) is placed on the servo valve block on
the LH side of the gearbox (see also page 440/24).
1. If this sensor has problems, the self diagnosis shows the
following fault codes:
--- A311 (temperature over +150˚C, impossible).
--- A312 (temperature below --- 50˚C, impossible).
2. Check then the sensor in the test mode, see table C on
page 371/9. Compare the temperature in display to the
actual temperature in the gearbox.
3. If the temperature reading in the display is clearly wrong
or it missis, check the sensor and its wiring. When needed,
measure the sensor resistance in connector X13 pins 10
and 6. If the resistance was infinite, check the resistance in
the sensor pins:
Resistance values of the sensor (±1 %):
--- 1600 Ω (± 0˚C)
--- 2000 Ω (+25˚C)
--- 3300 Ω (+100˚C)
4. Change a faulty sensor. Fix wirings.
Note! If this sensor is defective, it can cause engaging pro-
blems in various multi ---disc clutches (delays and jerks).
Note! If the sensor and its wires seem to be OK, but mal-
functions exist, the fault can lie in the control unit of the A
5.2.

2. Outdoor temperature B17

This sensor is placed in the front part of the tractor behind
the front grille on the signal horn bracket.
1. If you doubt, that the sensor is damaged, test it in the test
mode, see table C on page 371/9.
2. Compare the diplay reading to the ambient temperature.
If the outdoor temperature does not appear at all or it is
clearly wrong, check the sensor and its wires.
3. Check the sensor mounting. Check the sensor resistance
by measuring it in connector X19 pins 26 and 37. If the
resistance was infinite, check connector X1A pins 2 and 5.
Change faulty temperature sensor.
B14
Resistance values of the sensor (±1 %):
--- 1600 Ω (± 0˚C)
--- 2000 Ω (+25˚C)
--- 3300 Ω (+100˚C)
Note! The outdoor temperature sensor does not affect the
function of the AC 5.2 unit.
A
B. Clutch pedal position sensor B16
and B1W (TwinTrac), reconditioning
Note! In the AC 5.2 the clutch pedal position sensor has
been fastened so that its position cannot be adjusted.
Note! In the reverse drive controls (TwinTrac, option) there
is similar clutch pedal position sensor B1W, which should
be tested and calibrated separately.
1. If the position sensors have problems, the self diagnosis
can show the following fault codes:
--- fault code A128: Reference voltage of clutch pedal (and
gas pedal) sensor is not within given limits (4,5---5,5 VDC).
Eventually short circuit in wires
--- fault code A314: Signal from the front clutch pedal sen-
sor B16 is not within given limits. Sensor faulty fastened or
sensor/wires defective. Battery voltage too low.
--- fault code A351: Signal from rear clutch pedal sensor
B1W faulty. Sensor faulty fastened or sensor/wires defecti-
ve. This fault code appears only when the seat is turned
rearwards. Battery voltage too low.
2. Check the function of the sensors in the test mode (see
table C on page 371/9). If the function is not within given
limit values, check the mounting of the position sensor and
its wires. Also check the sensor lever fitting on the sensor
spindle. If the signal voltage is missing or it is not in limits
check the supply voltage (4,75---5,25 V) and signal voltage
by means of measuring cable ETV 894510 (see picture on
page 371 ---14).
Clutch pedal,
front / rear
Signal voltage
3. If You doubt poor contacts in wires/connectors, disconnect
and then reconnect the front sensor B16 connector and make
the same to the control unit connector A1A5.
4. In the same way, check the rear pedal sensor B1W connec-
tor and connector S1W pins 7 and 9 and connector A1A5 on
the control unit.
Note! If the wires are be OK, but malfunctions occur, the sen-
sor can be damaged or the fault can lie in the control unit A1
of AC 5.2. Defective sensor or control unit must be changed.
4. When the fault has been repaired, calibrate the clutch pedal
sensors, see page 370/15 instr. C. The both pedals are calib-
rated in the same way but when calibrating the rear pedal, the
drive's seat must be turned rearwards.
523
Model
6250-- 8950
1. 8. 2000
Up
0,3---2,4 V
Code Page
371 13
In bottom
2,5---4,7 V