DAF CF65, CF75, CF85 Series . Manual - part 19

 

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DAF CF65, CF75, CF85 Series . Manual - part 19

 

 

©

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

©

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

©

1-17

AS Tronic fault codes

AS TRONIC

DAVIE XD diagnostics manual 

3

3155

Main range does not switch in selected gear:
-

insufficient air pressure available

-

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

-

mechanically defective gearbox

-

Gearbox does not disengage from the 
neutral position within a certain period of 
time or the selected gear is not reached 
within a certain period of time

-

If the above fault occurs when driving or 
during standstill, the gearbox will 
automatically shift to the neutral position

-

Automatic mode not available

3156

Main range engages a gear which does not 
correspond with the position sensor signal from 
the main range

-

When driving and at standstill the gearbox is 
automatically shifted to the neutral position If 
the neutral position cannot be reached, the 
clutch will remain open.

-

Automatic mode not available

3157

Gate selection sensor signal changes when 
driving, without a new gear being selected

-

Main valve Y10 and selector valve Y4 or Y5 
for gate selection are actuated cyclically to 
ensure the position of the engaged gear

-

Automatic mode available

3158

Main range sensor signal changes when driving, 
without a new gear being selected

-

Main valve Y10 and selector valve Y6 or Y7 
for main range are actuated to ensure the 
position of the engaged gear

-

If the last selected gear can no longer be 
engaged mechanically, a gear 
corresponding with the current vehicle 
speed is shifted

-

Automatic mode available

3159

The rear-mounted range box sensor signal 
changes when driving, without a new gear being 
selected

-

Main valve Y10 and selector valve Y8 or Y9 
for rear-mounted range box are actuated to 
ensure the position of the engaged gear

-

If the last selected gear can no longer be 
engaged mechanically, a gear 
corresponding with the current vehicle 
speed is shifted

-

Automatic mode available

3160

The splitter range sensor signal changes when 
driving, without a new gear being selected

-

Main valve Y10 and selector valve Y2 or Y3 
for splitter range and Y6 or Y7 for main 
range are actuated to ensure the position of 
the engaged gear

-

If the last selected gear can no longer be 
engaged mechanically, a gear 
corresponding with the current vehicle 
speed is shifted

-

Automatic mode available

3163

Incorrect or missing engine speed increase signal 
via message on CAN network

When driving:
-

no gear changes possible

-

automatic mode not available

At standstill:
-

driving off from a stationary position is 
possible, although the clutch and shifting 
comfort will be affected

Fault code

Fault code description with possible cause

Symptom

AS TRONIC

1-18

©

AS Tronic fault codes

3

DAVIE XD diagnostics manual

3166

Incorrect accelerator pedal potentiometer signal 
via message on CAN network:
-

accelerator pedal position exceeds 
stationary position and stationary signal is 
active

When driving:
-

shifting is possible

-

automatic mode not available

At standstill:
-

driving off from a stationary position and 
shunting are not possible

-

system is not available

3169

Post-switch function for supply voltage of 
modulator (D954) does not switch off:
-

pins A11 and B18 of modulator (D954) will 
still receive supply voltage after the ignition 
has been switched off

-

modulator outputs cannot be switched

When driving:
-

no gear changes possible

-

automatic mode not available

At standstill:
-

if the vehicle comes to a halt, the clutch will 
open and the gearbox is automatically 
shifted to the neutral position

-

driving off from a stationary position is not 
possible

-

system is not available

3170

Incorrect modulator supply voltage or incorrect 
post-switch function for modulator supply voltage 
during self-test:
-

pin A4/A5 of modulator (D954) without 
supply voltage when ignition is switched on 
and off

-

pins A11 and B18 of modulator (D954) 
without supply voltage when the ignition is 
switched on

-

When driving and at standstill all modulator 
and clutch unit switching is blocked

-

Current shifting and clutch positions are 
maintained

-

System not available

3175

Incorrect supply voltage on modulator, power 
supply after ignition, with ignition turned on and 
idling engine:
-

pin A1 of modulator (D954)

When driving:
-

no more gear changes possible

-

automatic mode not available

At standstill:
-

if the engine is idling, the drive-off gears 
(forward and reverse) can be engaged

-

if the engine is not running, the gearbox 
automatically shifts to the neutral position 
and the modulator switches off

-

when switching the ignition off and on, the 
self-test will not be finished successfully and 
the system will not be available

3177

No CAN communication possible between any 
vehicle systems due to problems with the V-CAN:
-

short circuit to earth, short circuit to supply or 
interruption on pin A8/A12 and/or pin A13/
A14 of modulator

-

defective modulator (D954)

When driving:
-

no gear changes possible

-

automatic mode not available

At standstill:
-

if the vehicle comes to a halt, the clutch will 
open and the gearbox is automatically 
shifted to the neutral position

-

driving off from a stationary position is not 
possible

-

system is not available

Fault code

Fault code description with possible cause

Symptom

 

 

 

 

 

 

 

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