DAF CF65, CF75, CF85 Series . Manual - part 189

 

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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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