DAF 95XF. Manual — part 163

©

200438

1-5

UPEC fault codes

UPEC

DAVIE XD diagnostics manual

2

34-8

The valve inside the pump unit (B136) does not
open fast enough due to:
-

mechanical problems

-

internal contamination

-

No noticeable system limitation in UPEC

35-1

Short circuit to supply on pump unit connections,
pin A24 and/or pin A25 of the ECU

-

Engine stalls and/or engine starts but does
not fire

35-2

Short circuit to earth or interruption in the pump
unit (B132) on pin A33 of the ECU, causing the
pump unit of cylinder 2 to be switched off

-

Engine running on 5 cylinders

-

Reduced engine output

Short circuit to earth on pump unit connections,
pin A24 and/or pin A25 of the ECU

-

Engine stalls and/or engine starts but does
not fire

Short circuit to supply of the pump unit (B132) on
pin A33 of the ECU

-

Engine stalls and/or engine starts but does
not fire

Interruption in the pump unit (B132) on pin A24 of
the ECU, causing the pump unit of cylinders 1, 2
and 3 to be switched off

-

Engine running on 3 cylinders

-

Engine does not supply power

35-4

The valve inside the pump unit (B132) does not
close due to:
-

jammed valve

-

internal contamination

-

internal wear

-

Engine running on 5 cylinders

-

Reduced engine output

The valve inside the pump unit (B132) does not
close fast enough due to:
-

internal contamination

-

internal wear

-

Reduced engine output

35-8

The valve inside the pump unit (B132) does not
open fast enough due to:
-

mechanical problems

-

internal contamination

-

No noticeable system limitation in UPEC

36-1

Short circuit to supply on pump unit connections,
pin A24 and/or pin A25 of the ECU

-

Engine stalls and/or engine starts but does
not fire

36-2

Short circuit to earth or interruption in the pump
unit (B134) on pin A28 of the ECU, causing the
pump unit of cylinder 4 to be switched off

-

Engine running on 5 cylinders

-

Reduced engine output

Short circuit to earth on pump unit connections,
pin A24 and/or pin A25 of the ECU

-

Engine stalls and/or engine starts but does
not fire

Short circuit to supply of the pump unit (B134) on
pin A28 of the ECU

-

Engine stalls and/or engine starts but does
not fire

Interruption in the pump unit (B134) on pin A25 of
the ECU, causing the pump unit of cylinders 4, 5
and 6 to be switched off

-

Engine running on 3 cylinders

-

Engine does not supply power

36-4

The valve inside the pump unit (B134) does not
close due to:
-

jammed valve

-

internal contamination

-

internal wear

-

Engine running on 5 cylinders

-

Reduced engine output

The valve inside the pump unit (B134) does not
close fast enough due to:
-

internal contamination

-

internal wear

-

Reduced engine output

Fault code

Fault code description with possible cause

Symptom

UPEC

1-6

©

200438

UPEC fault codes

2

DAVIE XD diagnostics manual

36-8

The valve inside the pump unit (B134) does not
open fast enough due to:
-

mechanical problems

-

internal contamination

-

No noticeable system limitation

41-1

Voltage level of crankshaft sensor (F552) sine-
wave signal on pins A1 and A13 of the ECU is too
low due to:
-

too large an air gap between flywheel and
crankshaft sensor

-

contact resistance in connection points

-

short circuit or interruption

-

No engine speed signal on pin B5 of the
ECU

Excessive oscillation of crankshaft sensor (F552)
sine-wave signal on pin A1 of the ECU due to:
-

irregularity in flywheel circumference

-

faulty fitting of the flywheel

-

No noticeable system limitation in UPEC

41-2

Too low a voltage level of camshaft sensor (F558)
sine-wave signal on pins A2 and A14 of the ECU
due to:
-

too large an air gap between pulse disc and
camshaft sensor

-

contact resistance in connection points

-

short circuit or interruption

-

Longer start time before engine fires

Excessive oscillation of camshaft sensor (F558)
sine-wave signal on pins A2 and A14 of the ECU
due to:
-

irregularity in pulse disc circumference

-

faulty fitting of the pulse disc

-

Longer start time before engine fires

41-8

Incorrect or unacceptable sine-wave signals of
both the crankshaft sensor (F552) and camshaft
sensor (F558) due to:
-

contact resistance in connection points

-

defective ECU

-

interruption or short circuit in crankshaft
sensor and camshaft sensor

-

Engine stalls and/or engine starts but does
not fire

42-1

Signal of crankshaft sensor (F552) on pins A1 en
A13 of ECU fails due to:
-

poor connection/bad contact

-

faulty sensor

-

No engine speed signal on pin B5

42-2

Synchronisation of crankshaft sensor signal and
camshaft sensor signals is not correct due to:
-

loose pulse disc

-

incorrect timing setting

-

signal disturbance caused by external
influences

-

Engine starts but will not fire

42-4

Missing or unacceptable sine-wave signal of
crankshaft sensor (F552) due to:
-

interruption on pin A1 and/or A13 of the ECU

-

short circuit to earth on pin A1 of the ECU

-

short circuit to supply on pin A1 of the ECU

-

short circuit between pins A1 and A13 of the
ECU

-

No engine speed signal on pin B5 of the
ECU

Fault code

Fault code description with possible cause

Symptom

©

200438

1-7

UPEC fault codes

UPEC

DAVIE XD diagnostics manual

2

42-8

Unacceptable sine-wave signal of crankshaft
sensor (F552) due to:
-

missing hole in flywheel, for example due to
fouling

-

No noticeable system limitation in UPEC

43-1

Interruption or short circuit/short circuit to supply/
short circuit to earth in the camshaft sensor
(F558) on pin A2 and/or A14 of the ECU

-

Longer start time before engine fires

43-2

Unacceptable sine-wave signal of camshaft
sensor (F558) due to:
-

loose pulse plate

-

Longer start time before engine fires

43-4

Missing or unacceptable sine-wave signal of
camshaft sensor (F558) due to:
-

interruption on pin A2 and/or A14 of the ECU

-

short circuit to earth on pin A2 of the ECU

-

short circuit to supply on pin A2 of the ECU

-

short circuit between pins A2 and A14 of the
ECU

-

Longer start time before engine fires

43-8

Synchronisation signal from camshaft sensor
(F558) faulty or missing under dynamic
conditions due to:
-

contact resistance in connection points of
camshaft sensor

-

faulty camshaft sensor

-

mechanical damage of the pulse plate or
camshaft sensor

-

interruption on pin A14 of the ECU

-

too low a voltage level of camshaft signal

-

Longer start time before engine fires

44-1

Excessive engine speed caused by:
-

downhill driving

-

incorrect changing down into a lower gear

-

No noticeable system limitation in UPEC

45-1

Signal measurement via coolant temperature
sensor (F566) not correct due to:
-

interruption on pin A22 and/or A5 of the ECU

-

Thermometer gives no reading

-

ECU switches to default replacement value
for engine coolant temperature

45-2

Signal measurement via coolant temperature
sensor (F566) not correct due to:
-

short circuit to earth on pin A22 of the ECU

-

short circuit between pins A22 and A5 of the
ECU

-

Thermometer gives no reading

-

ECU switches to default replacement value
for engine coolant temperature

45-4

No signal measurement via coolant temperature
sensor (F566) due to:
-

internal ECU fault

-

Thermometer gives no reading

-

ECU switches to default replacement value
for coolant temperature

46-1

Boost pressure signal measurement via inlet air
boost pressure/temperature sensor (F649) not
correct due to:
-

short circuit to supply on pin A12 and/or A23
of the ECU

-

Reduced engine output

-

ECU switches to default replacement value
for boost pressure

46-2

Boost pressure signal measurement via inlet air
boost pressure/temperature sensor (F649) not
correct due to:
-

interruption on pin A23 and/or A12 of the
ECU

-

short circuit to earth on pin A23 and/or A12
of the ECU

-

Reduced engine output

-

ECU switches to default replacement value
for boost pressure

Fault code

Fault code description with possible cause

Symptom

UPEC

1-8

©

200438

UPEC fault codes

2

DAVIE XD diagnostics manual

46-4

No boost pressure signal measurement via inlet
air boost pressure/temperature sensor (F649)
due to:
-

internal ECU fault

-

Reduced engine output

-

ECU switches to default replacement value
for boost pressure

47-1

Inlet air temperature signal measurement via inlet
air boost pressure/temperature sensor (F649) not
correct due to:
-

interruption on pin A21 and/or A17 of the
ECU

-

ECU switches to default replacement value
for inlet air temperature

47-2

Inlet air temperature signal measurement via inlet
air boost pressure/temperature sensor (F649) not
correct due to:
-

short circuit to earth on pin A21 of the ECU

-

short circuit between pins A21 and A17 of
the ECU

-

ECU switches to default replacement value
for inlet air temperature

47-4

No inlet air temperature signal measurement via
inlet air boost pressure/temperature sensor
(F649) due to:
-

internal ECU fault

-

ECU switches to default replacement value
for inlet air temperature

48-1

Signal measurement via fuel temperature sensor
(F565) not correct due to:
-

interruption on pin A6 and/or A11 of the ECU

-

ECU switches to default replacement value
for fuel temperature

48-2

Signal measurement via fuel temperature sensor
(F565) not correct due to:
-

short circuit to earth on pin A11 of the ECU

-

short circuit between pins A11 and A6 of the
ECU

-

ECU switches to default replacement value
for fuel temperature

48-4

No fuel temperature signal measurement via fuel
temperature sensor (F565) due to:
-

internal ECU fault

-

ECU switches to default replacement value
for fuel temperature

51-1

Signal measurement on potentiometer in
accelerator pedal sensor (F672) not correct due
to:
-

short circuit to supply on pin B23 of the ECU

-

interruption on pin B35 of the ECU

-

short circuit between pin B16 and pin B23 of
the ECU

-

moisture in connector connection

-

Indistinct response to accelerator pedal

-

Engine runs at increased idling speed

51-2

Signal measurement on potentiometer in
accelerator pedal sensor (F672) not correct due
to:
-

interruption on pin B16 and/or pin B23 of the
ECU

-

short circuit to earth on pin B16 and/or pin
B23 of the ECU

-

short circuit between pin B16 and pin B35 of
the ECU

-

short circuit between pin B23 and pin B35 of
the ECU

-

moisture in connector connection

-

Indistinct response to accelerator pedal

-

Engine runs at increased idling speed

51-4

No signal measurement on potentiometer in
accelerator pedal sensor (F672) due to:
-

internal ECU fault

-

Indistinct response to accelerator pedal

-

Engine runs at increased idling speed

Fault code

Fault code description with possible cause

Symptom