DAF CF65, CF75, CF85 Series . Manual — part 189
©
200351
5-3
PE/XE engine, general
DIAGNOSTICS
ΧΦ65/75/85 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
Check 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
Mechanical defect or clogging in pump units
Replace the pump units
Injector defective
Check the injectors
Fuel lift pump delivery too low
Check the fuel lift pump and replace if necessary
Pressure relief valve on pump housing does not
shut off
Check the pressure relief valve
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
Air filter clogged
Replace or clean the air filter
DIAGNOSTICS
5-4
©
200351
PE/XE engine, general
1
ΧΦ65/75/85 series
2
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 pump units
Replace the pump units
Injector defective
Check the injectors
Pressure relief valve on pump housing does not
shut off
Check the pressure relief valve
Fuel lift pump delivery too low
Check the fuel lift pump and replace if necessary
SYMPTOM: REDUCED POWER AT ALL ENGINE SPEEDS
Possible cause
Remedy
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
Pressure relief valve on pump housing does not
shut off
Check the pressure relief valve
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 pump units
Replace the pump units
Injector defective
Check the injectors
Fuel lift pump delivery too low
Check the fuel lift pump and replace if necessary
SYMPTOM: BLACK SMOKE IS EMITTED
Possible cause
Remedy
Injector defective
Check the injectors
©
200351
5-5
PE/XE engine, general
DIAGNOSTICS
ΧΦ65/75/85 series
2
1
SYMPTOM: ENGINE CONSUMES TOO MUCH FUEL
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 and clean the system
Air leak in inlet system
Pressure-test the inlet 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 fuel lift pump seal
Fuel filter clogged
Replace the fuel filter and clean the system
Turbocharger defective
Check turbocharger
Mechanical defect or clogging in pump units
Replace the pump units
Fuel quantity adjustment by ABS/ASR
Fuel lift pump delivery too low
Check the fuel lift pump and replace if necessary
DIAGNOSTICS
5-6
©
200351
PE/XE engine, general
1
ΧΦ65/75/85 series
2
5.3 FAULT-FINDING TABLE, VEHICLE FUNCTIONS
SYMPTOM: CRUISE CONTROL DOES NOT WORK
Possible cause
Remedy
Steering column switch, mechanically defective/
interruption
Check the steering column switch in all positions
Condition(s) for disengaging cruise control present Check for presence of condition(s) for disengaging
The function has not been parametrised in the unit Adjust identity card
SYMPTOM: ENGINE SPEED CONTROL DOES NOT WORK
Possible cause
Remedy
Condition(s) for disengaging engine speed control
are present
Check for presence of condition(s) for disengaging
Steering column switch, mechanically defective/
interruption
Check the steering column switch in all positions
The customer parameter settings have not been
met
Check the customer parameter settings using
DAVIE
SYMPTOM: ENGINE CANNOT BE SWITCHED OFF WITH IGNITION KEY
Possible cause
Remedy
Fault in electrical components and/or wiring Power
supply to UPEC electronic unit not cut off.
Power supply to UPEC electronic unit after contact
not cut off with ignition switch
Check the electrical system
SYMPTOM: FAULT INDICATOR LAMP DOES NOT GO ON OR DOES NOT GO OFF
Possible cause
Remedy
Fault in electrical components and/or wiring of:
-
UPEC electronic unit
Check the electrical system
SYMPTOM: NO COMMUNICATION POSSIBLE WITH DAVIE
Possible cause
Remedy
Fault in electrical components and/or wiring of:
-
diagnostic connector
Power supply to UPEC electronic unit after contact
not cut off with ignition switch No power supply to
the UPEC electronic unit UPEC electronic unit
defective
Check the electrical system
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