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DAF LF45, LF55 Series. Manual - part 225

200508

4-1

Automatic gearbox

DIAGNOSTICS

ΛΦ45/55 series

4. AUTOMATIC GEARBOX

4.1 READING/DELETING ALLISON MD 3060 FAULT CODES

Fault code read function
To enter the fault code reading mode, briefly

press the two arrow keys twice simultaneously.

"D-1" appears on the display, followed by "-".

This means that at that point there are no faults

(active faults) in the system. It also means that no

faults have been registered that were earlier

temporarily present and have now been cleared

(inactive faults). The fault code reading function

can be left by pressing "D", "N", or "R" or the

arrow keys.

If the red lamp lights up while reading a fault

code, this means that there is an active fault in the

gearbox.

No message during reading means that the fault

is inactive.

The ECU can save five active/inactive fault codes

in its memory and show them on the display.

Fault codes consist of two sets of two digits (main

codes and sub-codes). To read the codes

consecutively, the "MODE" button must be

pressed each time.

The letters and digits appear one at a time on the

display.

The hyphen after D4 means that there are no

further faults and that it is therefore not necessary

to look at level D5.

As the ECU can only contain the five most

important codes, the five most important codes

will be seen on D1 to D5. Only when one of the

faults has been remedied will the ECU be in a

position to show a less important fault.

MODE

V300392

Example:

25 - 22

21 - 12

24 - 12

DIAGNOSTICS

4-2

200508

Automatic gearbox

ΛΦ45/55 series

Deleting fault codes
After faults have been remedied, the ECU

memory must be deleted. This is done as follows.

Press the arrow keys twice simultaneously. This

is the fault code reading mode. Press the

"MODE" key and hold it down until the red lamp

flashes three times (the first flash will be after

approx. three seconds, the second after approx.

10 seconds). All codes, active or inactive, have

now been deleted. Codes which return following

deleting and can therefore no longer be deleted

are active. Both types of fault need their causes

tracing and remedying as quickly as possible.

After the fault codes have been deleted the

ignition must be switched off and re-started;

otherwise it will not be possible to drive. This can

be seen from the flashing of the gear lever

position.

Inactive faults are automatically deleted by the

ECU if the fault no longer occurs after the vehicle

ignition has been switched off and on 25 times.

It is not possible to remedy all fault codes. Fault

codes that cannot be found in the "Table of Fault

Codes" can best be remedied by an Allison

dealer.

He has test and diagnostic apparatus at his

disposal that can be connected to a special

diagnostic socket in the central box (next to the

DAVIE connector).

MODE

V300392

200508

4-3

Automatic gearbox

DIAGNOSTICS

ΛΦ45/55 series

4.2 ALLISON MD 3060 TABLE OF FAULT CODES

Main code Sub-code

RECOMMENDED PROCEDURES

Electronic control unit (ECU) supply

12 Low

23 High

Check the following points:

earth and positive battery cables connected, firmly attached and clean.

batteries are charged.

vehicle loading system fails to load or loads too little or too much.

VIM fuse (Vehicle Interface Module).

VIM connections are firmly attached, clean and undamaged.

the correct wiring is used.

ECU connections are firmly attached, clean and undamaged.

If all these points are in order, contact your Allison dealer.

Accelerator pedal sensor

Check the following points:

Accelerator pedal sensor connector is properly connected.

no interruptions or short circuits between wires or earth in wiring harness

to accelerator pedal sensor.

Replace the accelerator pedal sensor if necessary.

If all these points are in order, contact your Allison dealer.

Main code Sub-code

RECOMMENDED PROCEDURES

Speed sensors

Check the following points:

connectors are firmly attached, clean and undamaged.

the speed sensor attachment bolt is tightened to the specified torque.

no interruptions or short circuits between wires or earth in wiring harness

to sensor.

If all these points are in order, contact your Allison dealer.

Selector keypad

Check the following points:

ECU connections - connectors are connected and clamped.

selector keypad is connected and the wire loop has been cut through.

no interruptions or short circuits between wires or earth in wiring harness

to selector.

Replace the selector if possible.

If all these points are in order, contact your Allison dealer.

Temperature in the gearbox sump too low

Check the following points:

temperature is lower than -6

″C.

If this is the case, it is a normal response to the ambient temperature.

If not, check whether the main gearbox is firmly connected and that

the connectors are undamaged.

If all these points are in order, contact your Allison dealer.

DIAGNOSTICS

4-4

200508

Automatic gearbox

ΛΦ45/55 series

Main code Sub-code

RECOMMENDED PROCEDURES

Temperature in the gearbox sump is too high

Run the engine at idling speed.

Ensure that the vehicle is entirely horizontal.

Check whether the correct dip stick has been installed.

Check the oil level.

If necessary, correct the oil level.

If the oil level is in order, check whether the engine system has

overheated, causing the gearbox to overheat.

Check that the ECU and gearbox connectors are correctly connected,

firmly attached and undamaged.

If all these points are in order, contact your Allison dealer.

Output shaft speed sensor

Check the following points:

connector is connected.

sensor bolt is firmly attached.

ECU is firmly attached with no damaged connectors.

oil level.

no interruptions or short circuits between wires or earth in wiring harness

to sensor.

If all these points are in order, contact your Allison dealer.

Coupling 3 pressure switch open

Let the engine idle while the vehicle's parking brake is applied.

Check the following points:

specified dip stick.

correct oil level.

Check the following points:

gearbox main connector is connected, is firmly attached, is clean

and undamaged.

ECU connector is connected, is firmly attached, is clean and

undamaged.

no interruptions or short circuits between wires or earth in wiring

harness.

If all these points are in order, contact your Allison dealer.

Main code Sub-code

RECOMMENDED PROCEDURES

Sensor fault in gearbox oil sump

Check the following points:

gearbox main connector is connected, is firmly attached, is clean and

undamaged.

ECU connector is connected, is firmly attached, is clean and undamaged.

no interruptions or short circuits between wires or earth in wiring harness.

If all these points are in order, contact your Allison dealer.

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