DAF CF65, CF75, CF85 Series . Manual - part 186

©

 200351

2-5

CE engine, general

DIAGNOSTICS

ΧΦ65/75/85 series

2

1

Injector defective

Check the injectors.

Fuel lift pump delivery too low

Check the fuel lift pump and replace if necessary

SYMPTOM: WHITE/BLUE SMOKE IS EMITTED

Possible cause

Remedy

SYMPTOM: BLACK SMOKE IS EMITTED

Possible cause

Remedy

Injector defective

Check 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

©

 200351

CE engine, general

1

ΧΦ65/75/85 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:
-

combi-switch

-

proximity switch

Check the electrical system

Condition(s) for disengaging vehicle speed control 
present

Check for presence of condition(s) for disengaging

SYMPTOM: ENGINE SPEED CONTROL DOES NOT WORK

Possible cause

Remedy

Condition(s) for disengaging engine speed control 
are present

Check for presence of condition(s) for disengaging

Fault in electrical components/wiring of:
wiring harness
-

combi-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 plugs

-

glow plug relay

Check the electrical system

Condition(s) for disengaging pre-glowing and after-
glowing function present

Check for presence of condition(s) for disengaging

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 OFF

Possible cause

Remedy

Fault in electrical components/wiring of:
-

wiring harness

-

Electronic unit

Check the electrical system

©

 200351

2-7

CE engine, general

DIAGNOSTICS

ΧΦ65/75/85 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

©

 200351

CE engine, general

1

ΧΦ65/75/85 series

2