DAF 95XF. Manual — part 36
2
XE engine
DIAGNOSIS
5-5
FAULT: REDUCED POWER AT ALL SPEEDS
Possible cause
Remedy
Poor fuel quality.
Drain fuel, rinse the fuel system, replace the fuel
filters and fill the fuel tank with fuel.
Fuel filter blocked.
Replace the fuel filter.
Accelerator pedal sensor, mechanical defect.
Check:
-
mechanical connection sensor/accelerator
pedal
-
accelerator pedal sensor
Fault in electrical components/wiring of:
-
accelerator pedal sensor
-
sensor for engine coolant temperature
-
boost pressure sensor
-
fuel temperature sensor
-
contacts
-
contact resistance in connector joints
Check the electrical system.
Air filter clogged.
Replace or clean the air filter.
Turbocharger defective/incorrect waste-gate
control.
Check wastegate or wastegate control.
Electro-pneumatic boost pressure valve
mechanically defective.
Check electro-pneumatic boost pressure valve.
Air leaks in inlet system.
Pressure-test the inlet system.
Mechanical defect or clogging of 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 output too low.
Check the fuel lift pump and replace, if
necessary.
1
ǹ 0008
2
DIAGNOSIS
XE engine
5-6
FAULT: REDUCED POWER ABOVE A PARTICULAR SPEED
Possible cause
Remedy
Fuel filter partially blocked.
Replace the fuel filter.
Air filter partially clogged.
Replace or clean the air filter.
Electro-pneumatic boost pressure valve
mechanically defective.
Check electro-pneumatic boost pressure valve.
Fault in electrical components/wiring of sensor
for electro-pneumatic boost pressure valve.
Check the electrical system.
Air leaks 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 output too low.
Check the fuel lift pump and replace, if
necessary.
FAULT: WHITE/BLUE SMOKE DEVELOPMENT
Possible cause
Remedy
Poor fuel quality.
Drain fuel, rinse the fuel system, replace the fuel
filters and fill the fuel tank with fuel.
Air in the fuel system.
Check the fuel system for drawing in air:
-
through suction pipe
-
through sealing ring of fuel lift pump
Fuel filter blocked.
Replace the fuel filter and clean the system.
Fault in electrical components/wiring of:
-
crankshaft position sensor
-
sensor for engine coolant temperature
Check the electrical system.
Mechanical defect or clogging of pump units.
Replace the pump units.
Injector defective.
Check the injectors.
Fuel lift pump output too low.
Check the fuel lift pump and replace, if
necessary.
1
ǹ 0008
2
XE engine
DIAGNOSIS
5-7
FAULT: BLACK SMOKE DEVELOPMENT
Possible cause
Remedy
Fault in electrical components/wiring of:
-
crankshaft position sensor
-
air inlet temperature sensor
-
fuel temperature sensor
-
boost pressure sensor
Check the electrical system.
Injector defective.
Check the injectors.
FAULT: FUEL CONSUMPTION TOO HIGH
Possible cause
Remedy
Poor fuel quality.
Drain fuel, rinse the fuel system, replace the fuel
filters and fill the fuel tank with fuel.
Fuel filter blocked.
Replace the fuel filter and clean the system.
Fault in electrical components/wiring of:
-
sensor for engine coolant temperature
-
boost pressure sensor
-
fuel temperature sensor
Check the electrical system.
Air leaks in inlet system.
Pressure-test the inlet system.
Mechanical defect or clogging of pump units.
Replace the pump units.
Injector defective.
Check the injectors.
Leaks in fuel system.
Check for leaks.
1
ǹ 0008
2
DIAGNOSIS
XE engine
5-8
FAULT: REDUCED MAXIMUM SPEED
Possible cause
Remedy
Air in the fuel system.
Check the fuel system for drawing in air:
-
through suction pipe
-
through sealing ring of fuel lift pump
Fuel filter blocked.
Replace the fuel filter and clean the system.
Crankshaft position sensor, signal fault.
Check:
-
crankshaft position sensor
-
wiring
Fault in electrical components/wiring of sensor
for
-
accelerator pedal sensor
-
engine coolant temperature sensor
Check the electrical system.
Turbocharger defective.
Check the turbocharger.
Mechanical defect or clogging of pump units.
Replace the pump units.
Fuel quantity adjusted by ABS/ASR.
Fuel lift pump output too low.
Check the fuel lift pump and replace, if
necessary.
1
ǹ 0008
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