DAF CF65, CF75, CF85 Series . Manual - part 18

1-11

AS Tronic fault codes

AS TRONIC

DAVIE XD diagnostics manual

3114

Clutch closes unexpectedly during standstill and
with engaged gear. Current clutch position
changes without the solenoid valves of the clutch
unit being actuated. The clutch unit travel sensor
transmits clutch movements to the modulator.
-

Poor freedom of movement of clutch plate
on the keyways of the input shaft

During controlled closing of the clutch, the
clutch remains temporarily open due to
insufficient mechanical freedom of
movement of the clutch (heavy point)

Mechanical fault of clutch unit solenoid
valves

At standstill:
-

gearbox is automatically shifted to the
neutral position

once the neutral position has been reached,
it will be possible to drive on after the
selector switch has been changed from
position D-N-D

automatic mode not available

3117

It is not possible to teach-in the clutch during the
self-test. No change in clutch position is detected,
despite actuation of solenoid valves Y14 to Y17 in
the clutch unit. Possible cause:
-

internal modulator fault (D954)

internal clutch unit fault (B385)

electrical fault in wiring harness between
modulator and clutch unit

incorrect clutch travel sensor signal, engine
speed signal or input shaft speed signal

System is not available

3118

Clutch does not open despite the fact that
solenoid valves Y16 and Y17 are actuated:
-

internal modulator fault (D954)

internal clutch unit fault (B385)

electrical fault in wiring harness between
modulator and clutch unit

incorrect clutch travel sensor signal, engine
speed signal or input shaft speed signal

When driving:
-

no more gear changes possible

automatic mode not available

At standstill:
-

if the vehicle comes to a halt, a new effort is
made to open the clutch

at standstill the gearbox is automatically
shifted to the neutral position

system is not available

3119

Clutch does not close despite the fact that
solenoid valves Y14 and Y15 are actuated. The
clutch cannot transmit any engine torque.
-

Clutch travel sensor does not recognise the
closing motion of the clutch when driving or
when the engine is idling

Input shaft speed is not equal to the engine
speed

Admissible solenoid valve switch-on time is
exceeded

When driving:
-

no more gear changes possible

automatic mode not available

At standstill:
-

if the vehicle comes to a halt, the clutch is
opened

at standstill the gearbox is automatically
shifted to the neutral position

system is not available

3120

Selector valve Y17 (slowly open clutch) is not
working despite actuation (3x):
-

mechanical fault of selector valve Y17

Function is taken over by redundant selector
valve Y16

Reduced shifting comfort

Automatic mode not available

3121

Selector valve Y16 (open clutch rapidly) is not
working despite actuation (3x):
-

mechanical fault of selector valve Y16

Function is taken over by redundant selector
valve Y17

Reduced shifting comfort

Automatic mode not available

3122

Selector valve Y15 (close clutch slowly) is not
working despite actuation (3x):
-

mechanical fault of selector valve Y15

Function is taken over by redundant selector
valve Y14

Reduced shifting comfort

Automatic mode not available

Fault code

Fault code description with possible cause

Symptom

AS TRONIC

1-12

AS Tronic fault codes

DAVIE XD diagnostics manual

3123

Selector valve Y14 (close clutch rapidly) is not
working despite actuation (3x):
-

mechanical fault of selector valve Y14

Function is taken over by redundant selector
valve Y15

Reduced shifting comfort

Automatic mode not available

3124

Incorrect clutch travel sensor signal due to:
-

clutch travel sensor signal being outside
ranch

increasing input shaft speed during
standstill, with the clutch sensor detecting an
opened clutch

unacceptable difference between engine
speed and input shaft speed, with clutch
being open

When driving:
-

clutch is opened and closed in a time-
controlled fashion

automatic mode not available

At standstill:
-

shunting is not possible

if driving off from a stationary position does
not take place within a certain period of time,
the gearbox will be automatically shifted to
the neutral position. The drive-off gear must
then be selected manually.

reduced clutch comfort when closing the
clutch as you drive off

3126

Incorrect pressure sensor signal from integrated
pressure sensor in the modulator (D954) due to:
-

defective pressure sensor in modulator

pressure sensor signal outside range

defective modulator (D954)

System available, provided there is sufficient
air supply to the modulator

Teaching in of position sensors of selector
valves and clutch position during the self-
test takes more time than usually

Automatic mode not available

3127

Incorrect ECU temperature signal from integrated
temperature sensor in the modulator (D954) due
to:
-

defective temperature sensor in modulator

temperature sensor signal outside range

defective modulator (D954)

No noticeable system limitation

Automatic mode not available

3129

Position sensor signal, main range, in the
modulator (D954):
-

short circuit to earth

short circuit to supply

interruption

When driving:
-

if the fault occurs during shifting, the signal
"gear engaged" from the main range
position sensor will be generated in a time-
controlled fashion

no more gear changes possible, except from
neutral position

automatic mode not available

At standstill:
-

the possibility to shift to the neutral position
is monitored by testing the engaging cylinder
for gate selection by actuating selector
valves Y4 and Y5

driving off from a stationary position is
possible

to prevent tooth-to-tooth contact, the air
supply main valve Y10 and main range
selector valves Y6/Y7 remain engaged until
the clutch position during closing exceeds a
particular value

Fault code

Fault code description with possible cause

Symptom

1-13

AS Tronic fault codes

AS TRONIC

DAVIE XD diagnostics manual

3132

Teach-in fault, main range position sensor, during
self-test:
-

main range position sensor signal outside
range

if there is insufficient air pressure and the air
pressure sensor is not defective, an effort is
made to shift the main range to the neutral
position

internal modulator fault (D954); selector
valves Y6/Y7 are not actuated correctly

mechanically defective gearbox

With ignition off, the gearbox is shifted to the
neutral position

With ignition on, the selector valves Y6/Y7
(main range) and Y10 (air supply) are
actuated. As a result the gearbox must be
shifted to the neutral position. This takes
place 3 times.

Mechanical neutral position is measured by
the main range position sensor. If this signal
is out of range and there is sufficient air
pressure (air pressure sensor in modulator),
a teach-in fault is stored.

System not available

3133

Position sensor signal, gate selection in the
modulator (D954):
-

short circuit to earth

short circuit to supply

interruption

When driving:
-

only the gears opposite to the reverse gear
can be shifted

automatic mode not available

At standstill:
-

only the drive-off gears opposite to the
reverse gear can be shifted

reverse gear not available

3136

Teach-in fault, gate selection position sensor,
during self-test:
-

if sufficient air pressure is available, the gate
selection sensor signal is out of range after
3 failed efforts to select another gate
position

if insufficient air pressure is available, the
gate selection sensor signal is out of range
after a certain waiting time and a new effort

internal modulator fault (D954); selector
valves Y4/Y5 are not actuated correctly

mechanically defective gearbox

In case of an electrical fault in selector
valves Y4/Y5 for gate selection the ECU
tries to engage the forward gears of the main
range: 12AS - 2

gear of main range;

16AS - 3

gear of main range

If the forward gears cannot be engaged, the
ECU will try to engage the reverse gear gate
of the main range: 12AS - R/1

gear of main

range; 16AS - 1

gear of main range

If it is possible to teach-in a gate, only the
gears in that particular gate can be shifted

If this is not possible, the system is not
available

Automatic mode not available

3137

Position sensor signal, rear-mounted range box
in the modulator (D954):
-

short circuit to earth

short circuit to supply

interruption

When driving:
-

only gears in the high or low range can be
shifted

no shifting up/down is possible when driving

if the fault occurs when shifting up/down, the
gears will be shifted in a time-controlled and
delayed fashion

Automatic mode not available

At standstill:
-

all drive-off gears can be engaged

main valve Y10 and rear-mounted range box
valve Y8 or Y9 remain actuated until the
clutch has reached a certain position. This
prevents tooth-to-tooth contact of the rear-
mounted range box

Fault code

Fault code description with possible cause

Symptom

AS TRONIC

1-14

AS Tronic fault codes

DAVIE XD diagnostics manual

3140

Teach-in fault, rear-mounted range box position
sensor, during self-test:
-

if there is sufficient air pressure, the sensor
signal of the rear-mounted range box is out
of range

internal modulator fault (D954); selector
valve Y8 or Y9 is not actuated correctly

mechanically defective gearbox

With ignition off, the gearbox remains in the
last selected range

Through actuation of main valve Y10 and
selector valve Y8 or Y9 for the rear-mounted
range box, the position of the engaged
range is ensured once again

If it is only possible to teach-in the low range,
gears can only be shifted in this range

If it is only possible to teach-in the high
range, gears can only be shifted in this
range

If it is impossible to teach-in either the low or
the high range, no more gears can be shifted

System is not available

3141

Position sensor signal, splitter range in the
modulator (D954):
-

short circuit to earth

short circuit to supply

interruption

It is not possible to shift gears in the splitter
range

Driving is only possible in the last selected
position of the splitter range: K1 or K2. If we
assume that K2 is the last selected position,
the PTO function will not be available

If the selected gear cannot be engaged, the
next higher gear is engaged, if possible

If the fault occurs when shifting the splitter
range, this range will be shifted in a time-
controlled and delayed fashion

Automatic mode not available

3144

Teach-in fault, splitter range position sensor,
during self-test:
-

if there is sufficient air pressure, the sensor
signal of the splitter range is out of range

internal modulator fault (D954); selector
valve Y2 or Y3 is not actuated correctly

mechanically defective gearbox

With ignition off, the gearbox remains in the
last selected range

Through actuation of main valve Y10 and
selector valve Y2 or Y3 for the splitter range,
the position of the engaged range is ensured
once again

If it is only possible to teach-in the low range,
only low-range gears can be engaged

If it is only possible to teach-in the high
range, only high-range gears can be
engaged

If it is impossible to teach-in either the low or
the high range, no more gears can be shifted

System is not available

3145

Rear-mounted range box does not disengage
from the last selected position after actuation:
-

insufficient air pressure available

internal modulator fault (D954); selector
valves Y8/Y9 are not actuated correctly

mechanically defective gearbox

When driving:
-

when shifting from the low to the high range,
the highest gear of the low range is engaged

when shifting from the high to the low range,
the lowest gear of the high range is engaged

automatic mode not available

At standstill:
-

if it is impossible to shift the low range, the
lowest gear in the high range is selected as
drive-off gear

no reverse shifting possible in the high range

Fault code

Fault code description with possible cause

Symptom

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