DAF CF65, CF75, CF85 Series . Manual - part 185

 

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DAF CF65, CF75, CF85 Series . Manual - part 185

 

 

©

 200351

2-1

CE engine, general

DIAGNOSTICS

ΧΦ65/75/85 series

2

1

2. 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

©

 200351

CE engine, general

1

ΧΦ65/75/85 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.

©

 200351

2-3

CE 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

Fault in electrical components/wiring of the engine 
coolant temperature sensor

Check the electrical system

Injector defective

Check the injectors.

Crankshaft position sensor defective

Check the crankshaft position sensor

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

Check the injectors.

Fuel lift pump delivery too low

Check the fuel lift pump and replace if necessary

Pressure relief valve on common rail does not shut 
off

Check the pressure relief valve

DIAGNOSTICS

2-4

©

 200351

CE engine, general

1

ΧΦ65/75/85 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 connections

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

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 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 injectors

Replace the injectors

 

 

 

 

 

 

 

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