DAF CF65, CF75, CF85 Series . Manual — part 412
©
200416
5-5
Fuel system, XE/PE engine
DIAGNOSTICS
ΧΦ65/75/85 series
4
1
SYMPTOM: ENGINE OVERHEATED
Possible cause
Remedy
Poor fuel quality
Drain fuel, flush fuel system, replace the fuel filters
and fill fuel tank with fuel
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 fine filter/coarse filter clogged
Replace fuel fine filter and clean the system
Mechanical defect or clogging in pump units
Replace the pump units
Injector defective
Check 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 seal of the fuel lift pump
Fuel fine filter/coarse filter clogged
Replace the fuel filter and clean the system
Mechanical defect or clogging in pump units
Replace the pump units
Fuel lift pump delivery too low
Check:
-
the fuel lift pump and replace if necessary
-
the gallery pressure
DIAGNOSTICS
5-6
©
200416
Fuel system, XE/PE engine
1
ΧΦ65/75/85 series
4
©
200416
6-1
XE/PE engine inlet/exhaust system
DIAGNOSTICS
ΧΦ65/75/85 series
4
1
6. XE/PE ENGINE INLET/EXHAUST SYSTEM
6.1 INTRODUCTION
If there is a fault in the system, it is usually
detected by the electronic unit in the form of a
fault code. This fault code can be read out using
DAVIE. The fault-finding table contains possible
causes of symptoms not detected by the
electronic unit.
DIAGNOSTICS
6-2
©
200416
XE/PE engine inlet/exhaust system
1
ΧΦ65/75/85 series
4
6.2 FAULT-FINDING TABLE
SYMPTOM: REDUCED POWER AT ALL ENGINE SPEEDS
Possible cause
Remedy
Air filter clogged
Replace or clean the air filter
Turbocharger defective/wastegate control incor-
rect
Check the turbocharger/wastegate control
Air leak in inlet system
Pressure-test the air inlet system
SYMPTOM: REDUCED POWER ABOVE A CERTAIN ENGINE SPEED
Possible cause
Remedy
Air filter partially clogged
Replace or clean the air filter
Air leak in inlet system
Pressure-test the air inlet system
SYMPTOM: FUEL CONSUMPTION TOO HIGH
Possible cause
Remedy
Turbocharger defective
Check turbocharger
Air leak in inlet system
Pressure-test the air inlet system
SYMPTOM: REDUCED MAXIMUM ENGINE SPEED
Possible cause
Remedy
Turbocharger defective
Check turbocharger
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