DAF CF65 Series Service Manual page 47

4
series
SYMPTOM: ENGINE RUNS AT (INCREASED) IDLING SPEED AND DOES NOT RESPOND TO AC-
Possible cause
Mechanical defect of accelerator pedal sensor
SYMPTOM: DIESEL KNOCK DURING ACCELERATION
Possible cause
Poor fuel quality
Air in fuel system
Injector defective
Possible cause
Poor fuel quality
Air in fuel system
Fuel fine filter/coarse filter clogged
Mechanical defect or clogging in pump units
Injector defective
Fuel lift pump delivery too low
Pressure relief valve on pump housing does not
shut off
SYMPTOM: REDUCED POWER AT ALL ENGINE SPEEDS
Possible cause
Poor fuel quality
Fuel fine filter/coarse filter clogged
Mechanical defect or clogging in pump units
Mechanical defect of accelerator pedal sensor
©
200416
CELERATOR PEDAL
SYMPTOM: IRREGULAR RUNNING OF ENGINE
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Fuel system, XE/PE engine
Remedy
Check:
- mechanical connection of sensor/accelerator
pedal
- accelerator pedal sensor
Remedy
Drain fuel, flush fuel system, replace the fuel filters
and fill fuel tank with fuel
Check for drawing in of air:
- via the suction pipe
- via the seal of the fuel lift pump
Check the injectors
Remedy
Drain fuel, flush fuel system, replace the fuel filters
and fill fuel tank with fuel
Check for drawing in of air:
- via the suction pipe
- via the seal of the fuel lift pump
Replace fuel fine filter and clean the system
Replace the pump units
Check the injectors
Check:
- the fuel lift pump and replace if necessary
- the gallery pressure
Check the gallery pressure
Remedy
Drain fuel, flush fuel system, replace the fuel filters
and fill fuel tank with fuel
Replace fuel fine filter and clean the system
Replace the pump units
Check:
- mechanical connection of sensor/accelerator
pedal
- accelerator pedal sensor
DIAGNOSTICS
5-3
1