DAF LF45, LF55 Series. Manual — part 158
©
200505
2-1
BE/CE engine, general
DIAGNOSTICS
ΛΦ45/55 series
2
1
2. BE/CE ENGINE, GENERAL
2.1 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
2-2
©
200505
BE/CE engine, general
1
ΛΦ45/55 series
2
2.2 FAULT-FINDING TABLE, ENGINE FUNCTIONS
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
-
via the fuel lift pump seal
Fuel filter clogged
Replace the fuel filter and clean the system
While carrying out an engine test with DAVIE,
communication with DAVIE was interrupted
Remove the battery earth lead and then refit it
No fuel supply/fuel lift pump defective; no delivery Check:
-
the fuel level
-
the pipes for blockage and leaks
-
the fuel lift 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
-
via the fuel lift pump seal
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
-
via the fuel lift pump seal
Fuel filter clogged
Replace the fuel filter and clean the system
Battery voltage too low
Charge the batteries
Mechanical defect or clogging in injector
Replace the injector
Fuel lift pump delivery too low
Check the fuel lift pump and replace if necessary
Internal leakage between the fuel supply pipe and
the injector
Check the fuel supply pipe/injector connections for
internal leaks
©
200505
2-3
BE/CE engine, general
DIAGNOSTICS
ΛΦ45/55 series
2
1
SYMPTOM: ENGINE RUNS AT (INCREASED) IDLING SPEED AND DOES NOT RESPOND TO
ACCELERATOR PEDAL
Possible cause
Remedy
Mechanical defect of accelerator pedal sensor
Check:
-
the mechanical connection between the
sensor and the accelerator pedal
-
the accelerator pedal sensor
Fuel quantity adjustment by ABS/ASR
Engine brake input signal present
Check the electrical system of the engine brake
SYMPTOM: DIESEL KNOCK DURING ACCELERATION
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
-
via the fuel lift pump seal
Injector defective
Inspect the injectors
SYMPTOM: IRREGULAR RUNNING OF ENGINE
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
-
via the fuel lift pump seal
Fuel filter clogged
Replace the fuel filter
Connection points on injectors mixed up
Connect the correct connection points to the
correct injector
Mechanical defect or clogging in injectors
Replace the injectors
Injector defective
Inspect the injectors
Fuel lift pump delivery too low
Check the fuel lift pump and replace if necessary
Pressure relief valve on fuel rail does not shut off
Check the pressure relief valve
DIAGNOSTICS
2-4
©
200505
BE/CE engine, general
1
ΛΦ45/55 series
2
SYMPTOM: REDUCED POWER AT ALL ENGINE SPEEDS
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
Mechanical defect of accelerator pedal sensor
Check:
-
the mechanical connection between the
sensor and the accelerator pedal
-
the accelerator pedal sensor
Fault in electrical components/wiring of:
-
contacts
-
contact resistors in connector contacts
Check the electrical system
Air filter clogged
Replace or clean the air filter
Turbocharger defective/wastegate control
incorrect
Check the turbocharger/wastegate control
Air leak in inlet system
Pressure-test the inlet system
Mechanical defect or clogging in injectors
Replace the injectors
Fuel lift pump delivery too low
Check the fuel lift pump and replace if necessary
SYMPTOM: REDUCED POWER ABOVE A CERTAIN ENGINE SPEED
Possible cause
Remedy
Fuel filter partially clogged
Replace the fuel filter
Air filter partially clogged.
Replace or clean the air filter
Air leak in inlet system
Pressure-test the inlet system
Fuel lift pump delivery too low
Check the fuel lift pump and replace if necessary
SYMPTOM: WHITE/BLUE SMOKE IS EMITTED
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
-
via the fuel lift pump seal
Fuel filter clogged
Replace the fuel filter and clean the system
Mechanical defect or clogging in injectors
Replace the injectors
Injector defective
Inspect the injectors
Fuel lift pump delivery too low
Check the fuel lift pump and replace if necessary
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