DAF LF45, LF55 Series. Manual — part 157

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DIAGNOSTICS

ΛΦ45/55 series

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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 adjustment of the wastegate on

the turbocharger.

-

Check the exhaust brake butterfly valve for

correct operation.

-

Check the charge cooler exterior for dirt

deposits.

-

Clean the water separator.

-

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 suction line for clogging and

flow resistance.

-

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 gas 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.

-

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.

Repeat the acceleration test. If necessary, plot a

boost pressure curve.

DIAGNOSTICS

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1.3 ACCELERATION TEST FORM

General data

Customer's name:

Chassis number:

Registration number:

Test conditions

Weather conditions: dry / rain / wet road / drizzle

Wind force: none / average / strong

Outside temperature:

°C

Vehicle data

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

TOPEC data

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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DIAGNOSTICS

ΛΦ45/55 series

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1

1.4 ACCELERATION TEST USING DAVIE

The acceleration test can also be carried out

using DAVIE. Collect the necessary data and,

after starting DAVIE, go to the engine

management system and carefully follow the

instructions in DAVIE for carrying out the test

correctly.

The test results should be saved to diskette after

each test.

The acceleration test in DAVIE

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".

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DIAGNOSTICS

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©

200505

Tractive problems

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ΛΦ45/55 series

2