DAF LF45, LF55 Series. Manual - part 159

©

 200505

2-5

BE/CE engine, general

DIAGNOSTICS

ΛΦ45/55 series

2

1

SYMPTOM: BLACK SMOKE IS EMITTED

Possible cause

Remedy

Injector defective

Inspect the injectors

SYMPTOM: FUEL CONSUMPTION TOO HIGH

Possible cause

Remedy

Poor fuel quality

Drain fuel, flush fuel system, replace the fuel filters 

and fill fuel tank with fuel

Fuel filter clogged

Replace the fuel filter and clean the system

Air leak in inlet system

Pressure-test the inlet system

Mechanical defect or clogging in injectors

Replace the injectors

Leak in fuel system

Check for leaks

SYMPTOM: REDUCED MAXIMUM ENGINE SPEED

Possible cause

Remedy

Air in fuel system

Check for drawing in of air:

-

via the suction pipe

-

via the fuel lift pump seal

Fuel filter clogged

Replace the fuel filter and clean the system

Turbocharger defective

Check turbocharger

Mechanical defect or clogging in injectors

Replace the injectors

Fuel quantity adjustment by ABS/ASR

Fuel lift pump delivery too low

Check the fuel lift pump and replace if necessary

DIAGNOSTICS

2-6

©

 200505

BE/CE engine, general

1

ΛΦ45/55 series

2

2.3 FAULT-FINDING TABLE, VEHICLE FUNCTIONS

SYMPTOM: VEHICLE SPEED CONTROL DOES NOT WORK

Possible cause

Remedy

Fault in electrical components/wiring of:

-

steering column switch

-

proximity switch

Check the electrical system

Condition(s) for disengaging vehicle speed control 

present

Check for presence of disengaging condition(s)

SYMPTOM: ENGINE SPEED CONTROL DOES NOT WORK

Possible cause

Remedy

Condition(s) for disengaging engine speed control 

present

Check for presence of disengaging condition(s)

Fault in electrical components/wiring of:

-

wiring harness

-

steering column switch

Check the electrical system

SYMPTOM: PRE-GLOWING AND AFTER-GLOWING FUNCTION DOES NOT WORK

Possible cause

Remedy

Fault in electrical components/wiring of:

-

wiring harness

-

warning lamp, pre-glowing

-

glow element

-

relay, glow element

Check the electrical system

SYMPTOM: ENGINE CANNOT BE SWITCHED OFF WITH IGNITION KEY

Possible cause

Remedy

Power supply to electronic unit not cut off.

Power supply to electronic unit after contact not cut 

off with contact switch.

Check the electrical system

SYMPTOM: FAULT INDICATOR LAMP DOES NOT GO ON OR DOES NOT GO OFF

Possible cause

Remedy

Fault in electrical components/wiring of:

-

wiring harness

-

electronic unit

Check the electrical system

©

 200505

2-7

BE/CE engine, general

DIAGNOSTICS

ΛΦ45/55 series

2

1

SYMPTOM: NO COMMUNICATION POSSIBLE WITH DAVIE

Possible cause

Remedy

Fault in electrical components/wiring of:

-

wiring harness

-

diagnostic connector

Power supply to electronic unit after contact not cut 

off with contact switch.

No supply voltage to the electronic unit

Electronic unit defective

Check the electrical system

DIAGNOSTICS

2-8

©

 200505

BE/CE engine, general

1

ΛΦ45/55 series

2