DAF LF45, LF55 Series. Manual — part 284
©
200416
2-5
Fuel system
DIAGNOSTICS
ΛΦ45/55 series
4
1
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
Injector(s) mechanically defective or clogged
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
Fuel fine filter/coarse filter clogged
Replace the fuel 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
DIAGNOSTICS
2-6
©
200416
Fuel system
1
ΛΦ45/55 series
4
©
200416
3-1
Inlet/exhaust system
DIAGNOSTICS
ΛΦ45/55 series
4
1
3. INLET/EXHAUST SYSTEM
3.1 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
3-2
©
200416
Inlet/exhaust system
1
ΛΦ45/55 series
4
3.2 FAULT-FINDING TABLE
SYMPTOM: REDUCED POWER AT ALL ENGINE SPEEDS
Possible cause
Remedy
Air filter element blocked
Replace the air filter element
Turbocharger defective/wastegate control incor-
rect
Check the turbocharger/wastegate control
Air leak in inlet system
Pressure-test the inlet system
SYMPTOM: REDUCED POWER ABOVE A CERTAIN ENGINE SPEED
Possible cause
Remedy
Air filter element partially blocked
Check/replace the air filter element
Air leak in inlet system
Pressure-test the inlet system
SYMPTOM: FUEL CONSUMPTION TOO HIGH
Possible cause
Remedy
Turbocharger defective
Check the turbocharger
Air leak in inlet system
Pressure-test the inlet system
SYMPTOM: REDUCED MAXIMUM ENGINE SPEED
Possible cause
Remedy
Turbocharger defective
Check the turbocharger
SYMPTOM: RISING AND FALLING TURBOCHARGER SOUNDS
Possible cause
Remedy
Blocked turbocharger air intake
Check air intake and remove any obstacles
Compressor side of turbocharger contaminated
Clean compressor side with a non-corrosive clean-
ing agent or a soft brush. Check the intake side for
carbon deposits or other contamination
Turbocharger damaged
Replace the turbocharger and identify the cause
SYMPTOM: BLACK SMOKE EMERGES FROM EXHAUST
Possible cause
Remedy
Air filter element blocked
Replace the air filter element
Air leakage between turbocharger and inlet mani-
fold
Check flexible pipes and pressurise intake unit
Air leakage between the inlet manifold and cylinder
head
Check for leakage. Replace gaskets, if necessary
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