DAF 95XF. Manual — part 37
2
XE engine
DIAGNOSIS
5-9
5.2 FAULT-FINDING TABLE FOR VEHICLE FUNCTIONS
FAULT: VEHICLE SPEED CONTROL IS NOT FUNCTIONING
Possible cause
Remedy
Fault in electrical components/wiring of:
-
wiring harness
-
combination switch
-
speed signal
-
proximity switch
Check the electrical system.
There is/are switch-off condition(s) for vehicle
speed control.
Check for presence of switch-off condition(s).
FAULT: ENGINE SPEED CONTROL IS NOT FUNCTIONING
Possible cause
Remedy
There is/are switch-off condition(s) for engine
speed control.
Check for presence of switch-off condition(s).
Fault in electrical components/wiring of:
-
wiring harness
-
combination switch
-
speed signal
Check the electrical system.
FAULT: DEFECTIVE PRE-GLOWING AND AFTER-GLOWING FUNCTIONS
Possible cause
Remedy
Fault in electrical components/wiring of:
-
wiring harness
-
preglowing control light
-
glow filaments
-
glow-filament relay
Check the electrical system.
There is/are switch-off condition(s) for the
pre-glowing and after-glowing functions.
Check for presence of switch-off condition(s).
1
ǹ 0008
2
DIAGNOSIS
XE engine
5-10
FAULT: INCORRECT SPEED DISPLAY ON REV COUNTER
Possible cause
Remedy
Fault in electrical components/wiring of:
-
wiring harness
-
crankshaft position sensor
-
electronic unit, UPEC
Check the electrical system.
FAULT: ENGINE CANNOT BE TURNED OFF WITH CONTACT KEY
Possible cause
Remedy
Fault in electrical components/wiring of wiring
harness.
Supply voltage to UPEC electronic unit is not
switched off.
Supply voltage after contact at the UPEC
electronic unit is not switched off by ignition lock.
Check the electrical system.
FAULT: WARNING LAMP DOES NOT LIGHT UP OR IS NOT EXTINGUISHED
Possible cause
Remedy
Fault in electrical components/wiring of:
-
wiring harness
-
electronic unit, UPEC
Check the electrical system.
FAULT: COMMUNICATION WITH DAVIE IMPOSSIBLE
Possible cause
Remedy
Fault in electrical components/wiring of:
-
wiring harness
-
diagnosis connector
Supply voltage after contact at the UPEC
electronic unit is not switched off by ignition lock.
No supply voltage on the UPEC electronic unit.
UPEC electronic unit defective.
Check the electrical system.
1
ǹ 0008
2
Cooling system XE engine
DIAGNOSIS
6-1
6. COOLING SYSTEM XE ENGINE
6.1 FAULT-FINDING TABLE
FAULT: ENGINE TEMPERATURE INCREASES
Possible cause
Remedy
Incorrect injectors installed.
Check whether the correct injectors have been
installed.
Inlet system failure.
Check the inlet system.
Lubrication system failure.
Check the lubricating-oil system.
Incorrect V-belt tension.
Check the V-belt tension or replace the V-belt.
Insufficient coolant.
Check the coolant level. Top up if necessary.
Coolant pipe torn or blocked.
Check the coolant pipes.
Intercooler, cooling system radiator
contaminated.
Check/clean the intercooler, the cooling system
radiator.
Wastegate setting is too high.
Check wastegate setting.
Air hose from turbocharger housing to wastegate
diaphragm leaking or not connected.
Check air hose. Replace if necessary.
Incorrect or malfunctioning pressure cap.
Check the pressure cap.
Thermostat opens insufficiently or not at all.
Check the thermostat and its operation.
Contaminated coolant filter.
Check the coolant filter. If necessary, replace
and clean the cooling system.
Defective water pump.
Check the water-pump shaft, bearings and
impeller. Replace the water pump, if necessary.
Defective viscous fan.
Check operation of viscous fan.
Poor fuel quality.
Drain fuel, rinse the fuel system, replace the fuel
filters and fill the fuel tank with fuel.
Sensor for engine coolant temperature, signal
fault/short-circuit/interruption.
Check:
-
engine coolant temperature sensor
-
wiring
1
ǹ 0008
2
DIAGNOSIS
Cooling system XE engine
6-2
FAULT: EXTERNAL COOLANT LEAKAGE
Possible cause
Remedy
Defective coolant pipes.
Check the coolant pipes.
Defective coolant pipes.
Check coolant pipes.
Leaking radiator.
Check the radiator. Pressure-test if necessary.
Leaking water pump.
Check the water pump. If necessary, measure
bearing play.
Defective oil cooler.
Check the oil cooler. Pressure-test if necessary.
Defective pressure cap.
Check the pressure cap. Pressure-test if
necessary.
Leaking heater.
Check heater pipes.
Leaking connection between coupling and water
pipe.
Check the connection between water pipe and
coupling for damage.
Replace the O-rings.
FAULT: INTERNAL COOLANT LEAKAGE
Possible cause
Remedy
Defective cylinder head gasket.
Check the cylinder head gasket.
Cracked cylinder heads or cylinder block.
Check the cylinder heads and engine block for
internal cracks. Pressure-test if necessary.
Leaking injector bushes.
Check cylinder heads. Pressure-test if
necessary.
Defective compressor cylinder head gasket.
Replace compressor cylinder head gasket.
Defective oil cooler.
Check whether there is coolant in the lubricating
oil system.
Defective freeze plugs in tappet area (cylinder
block) or at the top of the cylinder heads.
Replace the freeze plug(s).
1
ǹ 0008
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