DAF CF65, CF75, CF85 Series . Manual - part 412

©

 200416

5-5

Fuel system, XE/PE engine

DIAGNOSTICS

ΧΦ65/75/85 series

4

1

SYMPTOM: ENGINE OVERHEATED

Possible cause

Remedy

Poor fuel quality

Drain fuel, flush fuel system, replace the fuel filters 
and fill fuel tank with fuel

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

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 seal of the fuel lift pump

Fuel fine filter/coarse filter clogged

Replace the fuel filter and clean the system

Mechanical defect or clogging in pump units

Replace the pump units

Fuel lift pump delivery too low

Check:
-

the fuel lift pump and replace if necessary

-

the gallery pressure

DIAGNOSTICS

5-6

©

 200416

Fuel system, XE/PE engine

1

ΧΦ65/75/85 series

4

©

 200416

6-1

XE/PE engine inlet/exhaust system

DIAGNOSTICS

ΧΦ65/75/85 series

4

1

6. XE/PE ENGINE INLET/EXHAUST SYSTEM

6.1 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

6-2

©

 200416

XE/PE engine inlet/exhaust system

1

ΧΦ65/75/85 series

4

6.2 FAULT-FINDING TABLE

SYMPTOM: REDUCED POWER AT ALL ENGINE SPEEDS

Possible cause

Remedy

Air filter clogged

Replace or clean the air filter

Turbocharger defective/wastegate control incor-
rect

Check the turbocharger/wastegate control

Air leak in inlet system

Pressure-test the air inlet system

SYMPTOM: REDUCED POWER ABOVE A CERTAIN ENGINE SPEED

Possible cause

Remedy

Air filter partially clogged

Replace or clean the air filter

Air leak in inlet system

Pressure-test the air inlet system

SYMPTOM: FUEL CONSUMPTION TOO HIGH

Possible cause

Remedy

Turbocharger defective

Check turbocharger

Air leak in inlet system

Pressure-test the air inlet system

SYMPTOM: REDUCED MAXIMUM ENGINE SPEED

Possible cause

Remedy

Turbocharger defective

Check turbocharger