DAF 95XF. Manual — part 172

©

200438

1-13

AS Tronic fault codes

AS TRONIC

DAVIE XD diagnostics manual

3

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

nd

/3

rd

gear of main range;

16AS - 3

rd

/4

th

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

st

gear of main

range; 16AS - 1

st

/2

nd

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

©

200438

AS Tronic fault codes

3

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

©

200438

1-15

AS Tronic fault codes

AS TRONIC

DAVIE XD diagnostics manual

3

3146

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:
-

if the rear-mounted range box is not
switched over to the other position after 3
attempts, the highest gear of the low range
is engaged when shifting from the low to the
high range. 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

-

new attempts to shift the rear-mounted
range box can still be made

3147

Rear-mounted range box neither shifts in the high
range nor in the low range within a certain period
of time:
-

insufficient air pressure available

-

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

-

mechanically defective gearbox

-

If the selected range cannot be engaged
after 3 attempts, the last shifted range will be
engaged

-

If the last selected range can no longer be
engaged either, the gearbox will shift to the
neutral position

-

New attempts to shift the rear-mounted
range box can still be made

-

Automatic mode not available

3148

Splitter range does not disengage from last
selected position:
-

insufficient air pressure available

-

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

-

mechanically defective gearbox

When driving:
-

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

-

only the gears in the last selected position of
the splitter range can be engaged

-

automatic mode not available

At standstill:
-

only the drive-off gears in the last selected
position of the splitter range can be engaged

3149

Splitter range does not disengage from the last
selected position after actuation:
-

insufficient air pressure available

-

internal modulator fault (D954); selector
valves Y2/Y3 are not actuated correctly

-

mechanically defective gearbox

When driving:
-

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

-

only the gears in the last selected position of
the splitter range can be engaged

-

automatic mode not available

At standstill:
-

only the drive-off gears in the last selected
position of the splitter range can be engaged

3150

Splitter range neither shifts in the high range nor
in the low range (K1 or K2) within a certain period
of time:
-

insufficient air pressure available

-

internal modulator fault (D954); selector
valves Y2/Y3 are not actuated correctly

-

mechanically defective gearbox

-

Fault is stored during standstill

-

System is not available

Fault code

Fault code description with possible cause

Symptom

AS TRONIC

1-16

©

200438

AS Tronic fault codes

3

DAVIE XD diagnostics manual

3151

Gate selection cylinder does not disengage from
the last selected gate after actuation:
-

insufficient air pressure available

-

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

-

mechanically defective gearbox

When driving:
-

if the fault occurs during shifting, the
gearbox will shift down to the last selected
gear

-

if the previous gear cannot be engaged
because the speed is too high, the gear
closest to the previous one is engaged

-

if the highest possible gear cannot be
engaged because the speed is too high, the
gearbox will automatically shift to the neutral
position

-

automatic mode not available

At standstill:
-

if the desired drive-off gear cannot be
engaged, the gearbox will automatically shift
to the neutral position

-

a new drive-off gear can only be selected
using the selector switch

3152

Gate selection cylinder does not disengage from
the last selected gate after actuation:
-

insufficient air pressure available

-

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

-

mechanically defective gearbox

When driving:
-

selection cylinder returns to the last selected
position and the gearbox shifts back to the
last engaged gear

-

if the last selected gear cannot be engaged
because the speed is too high, the gear
closest to the previous one is engaged

-

if the highest possible gear cannot be
engaged because the speed is too high, the
gearbox will automatically shift to the neutral
position

-

automatic mode not available

At standstill:
-

if the desired drive-off gear cannot be
engaged, the gearbox will automatically shift
to the neutral position

3153

Gate selection cylinder does not shift to new or
previous end position within a certain period of
time:
-

insufficient air pressure available

-

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

-

mechanically defective gearbox

-

Both at standstill and when driving the
gearbox will automatically shift to the neutral
position

-

A new gear must be selected using the
selector switch

-

If no gate can be selected, the system is not
available

-

Automatic mode not available

3154

Main range sensor signal still displays "gear
engaged", with the clutch opened and the
gearbox shifted to the neutral position:
-

insufficient air pressure available

-

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

-

mechanically defective gearbox

When driving:
-

clutch only closes in the last selected gear

-

automatic mode not available

At standstill:
-

shifting is not possible until the neutral
position signal has been recognised

-

driving off from a stationary position in the
current gear is possible, provided it is equal
to or lower than the lowest gear of the high
range

Fault code

Fault code description with possible cause

Symptom