DAF CF65, CF75, CF85 Series . Manual - part 413

©

 200416

7-1

Engine brake, XE/PE engine

DIAGNOSTICS

ΧΦ65/75/85 series

4

1

7. ENGINE BRAKE, XE/PE ENGINE

7.1 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

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©

 200416

Engine brake, XE/PE engine

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ΧΦ65/75/85 series

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7.2 FAULT-FINDING TABLE

SYMPTOM: EXHAUST BRAKE DOES NOT ENGAGE

Possible cause

Remedy

Compressor delivers insufficient air pressure

Check the operation of the compressor

Air leak in the air pipe from air dryer to exhaust 
brake valve

Check air pipe

Butterfly valve stuck in butterfly valve housing

Check free movement of butterfly valve

Electrical fault

Check electrical circuit

SYMPTOM: EXHAUST BRAKE REMAINS ENGAGED

Possible cause

Remedy

Butterfly valve stuck in butterfly valve housing

Check free movement of butterfly valve

Electrical fault

Check electrical circuit

SYMPTOM: DEB DOES NOT ENGAGE

Possible cause

Remedy

Electrical fault

Check electrical circuit

Engine oil pressure too low

Check engine oil pressure

SYMPTOM: DEB REMAINS ENGAGED

Possible cause

Remedy

Electrical fault

Check electrical circuit

Solenoid valve mechanically blocked

Check solenoid valve

Damaged solenoid valve sealing rings

Replace all solenoid valve sealing rings

SYMPTOM: DEB OPERATES IRREGULARLY

Possible cause

Remedy

Electrical fault

Check electrical circuit

Incorrect setting of DEB clearance

Check the DEB clearance

Main piston stuck in DEB housing

Check free movement of main piston

Operating piston stuck in DEB housing

Check free movement of operating piston

Damaged solenoid valve sealing rings

Replace all solenoid valve sealing rings

Solenoid valve oil strainer is blocked

Clean solenoid valve oil strainer

Control valve stuck in DEB housing

Check free movement of control valve

Defective control valve

Check the operation of the control valve

Lubricating oil too thick

Run the engine at operating temperature

Lubricating oil diluted with fuel

Check lubricating oil for dilution

©

 200416

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Engine brake, XE/PE engine

DIAGNOSTICS

ΧΦ65/75/85 series

4

1

Air bubbles in the oil

Check the engine's oil level/oil specification

Oil duct sealing plugs in DEB housing

Clean/replace sealing plugs

SYMPTOM: DEB OPERATES IRREGULARLY

Possible cause

Remedy

DIAGNOSTICS

7-4

©

 200416

Engine brake, XE/PE engine

1

ΧΦ65/75/85 series

4