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
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