DAF CF65, CF75, CF85 Series . Manual - part 184

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Tractive problems

DIAGNOSTICS

ΧΦ65/75/85 series

2

1

Result of first acceleration test
If the acceleration time is not achieved, first carry 
out the following work.

-

Check the fuel system for the presence of air.

-

Replace or clean the air filter element.

-

Check the setting of the wastegate on the 
turbocharger (if present).

-

Check the exhaust brake butterfly valve for 
correct operation.

-

Check the charge cooler exterior for dirt 
deposits.

-

Clean the water separator (if present).

-

Check that the primer pump is attached.

-

Replace the fuel fine filter.

-

Check the suction pipe of the tank for 
clogging by coarse dirt.

-

Check the fuel tank for fouling. Clean with a 
steam cleaner, if necessary.

-

Check the air intake system for any leaks.

-

Check the exhaust system for any leaks.

-

Check the exhaust system for blockages by 
measuring the exhaust back pressure.

-

Check the turbocharger impellers on the 
compressor and turbine sides for damage 
and for deposits of salt or any other 
contaminants.

-

Check both the valve clearance and the DEB 
clearance (if present).

-

Check the injector pipes for damage.

-

Check the fuel gallery/rail pressure.

-

Check the fuel lift pump output.

-

Check whether the right type of components 
has been fitted. This includes turbocharger, 
injectors, etc.

-

Check the opening pressure of the injectors 
(if possible).

Repeat the acceleration test. If necessary, plot a 
boost pressure curve.

DIAGNOSTICS

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Tractive problems

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ΧΦ65/75/85 series

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1.3 ACCELERATION TEST FORM

General data

Test conditions

Vehicle data

TOPEC data

Customer's name:__________________________________________
Chassis number:______________

Registration number:______

Weather conditions: dry / rain / wet road / drizzle

Wind force: none / average / strong

Outside temperature:_______ 

|

C

Vehicle type:________

Trailer type:_________

Superstructure:____________

Total combination weight: ________kg

Total vehicle height: _________m

Cab type: day / sleeper / space / superspace
Aerodynamics: roof spoiler / fenders / front spoiler / skirts / sun visor / ____________________

Engine type:________

Gearbox type:_____________

Transmission:_________

Rear axle type:_______________

Transmission:_______________

Tyre size: front:__________

rear:____________________

Tyre make:_______________

Energy:____________________

Space between cab and superstructure/trailer: _________________m

Starting speed: ___________km/h

End speed: _____________km/h

Gear selection:___________

Acceleration time: __________sec.

Measured time of outward 
journey:

1: _______sec.

2: _______sec.

Average time of outward journey: ________sec.

3: _______sec.

Average time: _________sec.

Measured time of return 
journey:

1: _______sec.

2: _______sec.

Average return time: _________sec.

3: _______sec.

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Tractive problems

DIAGNOSTICS

ΧΦ65/75/85 series

2

1

1.4 ACCELERATION TEST USING DAVIE-XD

The acceleration test can also be carried out 
using DAVIE-XD. Collect the necessary data and, 
after starting DAVIE-XD, go to the engine 
management system and carefully follow the 
instructions in DAVIE-XD for carrying out the test 
correctly.

The test results should be saved to diskette after 
each test.

}

The acceleration test in DAVIE-XD 
should only be started when the 
vehicle is stationary. As the 
communication between the 
accelerator pedal sensor and the 
unit will be broken for a short time 
when DAVIE is started up, this can 
lead to dangerous situations when 
the vehicle is being driven.

When driving, never start a "direct test" or "guide 
diagnosis".

DIAGNOSTICS

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©

 200351

Tractive problems

1

ΧΦ65/75/85 series

2