DAF CF75 Series Service Manual

DIAGNOSTICS
2-2
©
200416
CE engine fuel system
1
ΧΦ65/75/85 series
4
2.2 FAULT-FINDING TABLE
SYMPTOM: ENGINE CAN BE STARTED, BUT DOES NOT RUN
Possible cause Remedy
Poor fuel quality Drain fuel, flush fuel system, replace the fuel filters
and fill fuel tank with fuel
Air in fuel system Check for drawing in of air:
- via the suction pipe
Fuel fine filter/coarse filter clogged Replace fuel fine filter and clean the system
No fuel supply/high-pressure pump or fuel lift pump
defective; no delivery
Check:
- the fuel level
- the rail pressure
- the pipes for blockage and leaks
- the fuel lift pump
- the high-pressure pump
SYMPTOM: ENGINE STALLS AND RUNS AGAIN AFTER RE-STARTING
Possible cause Remedy
Air in fuel system Check for drawing in of air:
- via the suction pipe
SYMPTOM: ENGINE STARTS POORLY
Possible cause Remedy
Poor fuel quality Drain fuel, flush fuel system, replace the fuel filters
and fill fuel tank with fuel
Air in fuel system Check for drawing in of air:
- via the suction pipe
Fuel fine filter/coarse filter clogged Replace fuel fine filter and clean the system
Injector(s) mechanically defective or clogged Replace the injectors
High-pressure pump or fuel lift pump delivery too
low
Check:
- the high-pressure pump
- the fuel lift pump
Internal fuel leak between fuel supply pipe(s) and
injector(s)
Check the quantity of return fuel
SYMPTOM: ENGINE RUNS AT (INCREASED) IDLING SPEED AND DOES NOT RESPOND TO AC-
CELERATOR PEDAL
Possible cause Remedy
Mechanical defect of accelerator pedal sensor Check:
- mechanical connection of sensor/accelerator
pedal
- accelerator pedal sensor
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DAF CF75 Series Specifications

General

Brand	DAF
Model	CF75 Series
Category	Trucks
Language	English