DAF LF45, LF55 Series. Manual — part 11

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1-11

UPEC fault codes

UPEC

DAVIE XD diagnostics manual

2

56-5

Irregular engine running detected by the ECU due
to:
-

fuel leak of injector pipes of cylinders 1 and 3

-

defective/clogged injectors of cylinders 1
and 3

-

air in fuel system

-

internal leakage of pump units of cylinders 1
and 3

-

clogged injector pipes of cylinders 1 and 3

-

too low a combustion pressure in cylinders 1
and 3 caused by a mechanical defect of the
engine (valve seal etc.)

-

Irregular engine running and reduced
engine power

56-6

Irregular engine running detected by the ECU due
to:
-

fuel leak of injector pipes of cylinders 3 and 5

-

defective/clogged injectors of cylinders 3
and 5

-

air in fuel system

-

internal leakage of pump units of cylinders 3
and 5

-

clogged injector pipes of cylinders 3 and 5

-

too low a combustion pressure in cylinders 3
and 5 caused by a mechanical defect of the
engine (valve seal etc.)

-

Irregular engine running and reduced
engine power

56-7

Irregular engine running detected by the ECU due
to:
-

fuel leak of injector pipes of cylinders 1, 3
and 5

-

defective/clogged injectors of cylinders 1, 3
and 5

-

air in fuel system

-

internal leakage of pump units of cylinders 1,
3 and 5

-

clogged injector pipes of cylinders 1, 3 and 5

-

too low a combustion pressure in cylinders
1, 3 and 5 caused by a mechanical defect of
the engine (valve seal etc.)

-

Irregular engine running and reduced
engine power

56-8

Irregular engine running detected by the ECU due
to:
-

fuel leak of injector pipe of cylinder 6

-

defective/clogged injector of cylinder 6

-

air in fuel system

-

internal leakage of pump unit of cylinder 6

-

clogged injector pipe of cylinder 6

-

too low a combustion pressure in cylinder 6
caused by a mechanical defect of the engine
(valve seal etc.)

-

Irregular engine running and reduced
engine power

Fault code

Fault code description with possible cause

Symptom

UPEC

1-12

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UPEC fault codes

2

DAVIE XD diagnostics manual

56-9

Irregular engine running detected by the ECU due
to:
-

fuel leak of injector pipes of cylinders 1 and 6

-

defective/clogged injectors of cylinders 1
and 6

-

air in fuel system

-

internal leakage of pump units of cylinders 1
and 6

-

clogged injector pipes of cylinders 1 and 6

-

too low a combustion pressure in cylinders 1
and 6 caused by a mechanical defect of the
engine (valve seal etc.)

-

Irregular engine running and reduced
engine power

56-10

Irregular engine running detected by the ECU due
to:
-

fuel leak of injector pipes of cylinders 5 and 6

-

defective/clogged injectors of cylinders 5
and 6

-

air in fuel system

-

internal leakage of pump units of cylinders 5
and 6

-

clogged injector pipes of cylinders 5 and 6

-

too low a combustion pressure in cylinders 5
and 6 caused by a mechanical defect of the
engine (valve seal etc.)

-

Irregular engine running and reduced
engine power

56-11

Irregular engine running detected by the ECU due
to:
-

fuel leak of injector pipes of cylinders 1, 5
and 6

-

defective/clogged injectors of cylinders 1, 5
and 6

-

air in fuel system

-

internal leakage of pump units of cylinders 1,
5 and 6

-

clogged injector pipes of cylinders 1, 5 and 6

-

too low a combustion pressure in cylinders
1, 5 and 6 caused by a mechanical defect of
the engine (valve seal etc.)

-

Irregular engine running and reduced
engine power

56-12

Irregular engine running detected by the ECU due
to:
-

fuel leak of injector pipes of cylinders 3 and 6

-

defective/clogged injectors of cylinders 3
and 6

-

air in fuel system

-

internal leakage of pump units of cylinders 3
and 6

-

clogged injector pipes of cylinders 3 and 6

-

too low a combustion pressure in cylinders 3
and 6 caused by a mechanical defect of the
engine (valve seal etc.)

-

Irregular engine running and reduced
engine power

Fault code

Fault code description with possible cause

Symptom

©

1-13

UPEC fault codes

UPEC

DAVIE XD diagnostics manual

2

56-13

Irregular engine running detected by the ECU due
to:
-

fuel leak of injector pipes of cylinders 1, 3
and 6

-

defective/clogged injectors of cylinders 1, 3
and 6

-

air in fuel system

-

internal leakage of pump units of cylinders 1,
3 and 6

-

clogged injector pipes of cylinders 1, 3 and 6

-

too low a combustion pressure in cylinders
1, 3 and 6 caused by a mechanical defect of
the engine (valve seal etc.)

-

Irregular engine running and reduced
engine power

56-14

Irregular engine running detected by the ECU due
to:
-

fuel leak of injector pipes of cylinders 3, 5
and 6

-

defective/clogged injectors of cylinders 3, 5
and 6

-

air in fuel system

-

internal leakage of pump units of cylinders 3,
5 and 6

-

clogged injector pipes of cylinders 3, 5 and 6

-

too low a combustion pressure in cylinders
3, 5 and 6 caused by a mechanical defect of
the engine (valve seal etc.)

-

Irregular engine running and reduced
engine power

56-15

Irregular engine running detected by the ECU due
to:
-

fuel leak of injector pipes of cylinders 1, 3, 5
and 6

-

defective/clogged injectors of cylinders 1, 3,
5 and 6

-

air in fuel system

-

internal leakage of pump units of cylinders 1,
3, 5 and 6

-

clogged injector pipes of cylinders 1, 3, 5
and 6

-

too low a combustion pressure in cylinders
1, 3, 5 and 6 caused by a mechanical defect
of the engine (valve seal etc.)

-

Irregular engine running and reduced
engine power

57-1

Irregular engine running detected by the ECU due
to:
-

fuel leak of injector pipe of cylinder 2

-

defective/clogged injector of cylinder 2

-

air in fuel system

-

internal leakage of pump unit of cylinder 2

-

clogged injector pipe of cylinder 2

-

too low a combustion pressure in cylinder 2
caused by a mechanical defect of the engine
(valve seal etc.)

-

Irregular engine running and reduced
engine power

Fault code

Fault code description with possible cause

Symptom

UPEC

1-14

©

UPEC fault codes

2

DAVIE XD diagnostics manual

57-2

Irregular engine running detected by the ECU due
to:
-

fuel leak of injector pipe of cylinder 4

-

defective/clogged injector of cylinder 4

-

air in fuel system

-

internal leakage of pump unit of cylinder 4

-

clogged injector pipe of cylinder 4

-

too low a combustion pressure in cylinder 4
caused by a mechanical defect of the engine
(valve seal etc.)

-

Irregular engine running and reduced
engine power

57-3

Irregular engine running detected by the ECU due
to:
-

fuel leak of injector pipes of cylinders 2 and 4

-

defective/clogged injectors of cylinders 2
and 4

-

air in fuel system

-

internal leakage of pump units of cylinders 2
and 4

-

clogged injector pipes of cylinders 2 and 4

-

too low a combustion pressure in cylinders 2
and 4 caused by a mechanical defect of the
engine (valve seal etc.)

-

Irregular engine running and reduced
engine power

61-8

Internal CAN fault in ECU

-

System reaction depending on the missing V
CAN data

62-2

No CAN message received from ABS/EBS ECU
relating to the engine torque control due to:
-

communication problem with ABS/EBS ECU

-

No noticeable system limitation in UPEC

Communication problem via V-CAN on pin B11 or
pin B12 of the ECU due to:
-

interruption on pin B11 or B12 of the ECU

-

short circuit to supply on pin B11 or B12 of
the ECU

-

Rev counter gives no reading

-

Thermometer gives no reading

Communication problem via V-CAN on pin B12 of
the ECU due to:
-

short circuit to earth on pin B12 of the ECU

-

Rev counter gives no reading

63-2

No CAN message received from ABS/EBS ECU
relating to the engine braking function due to:
-

communication problem with ABS/EBS ECU

-

No noticeable system limitation in UPEC

Communication problem via V-CAN on pin B11 or
pin B12 of the ECU due to:
-

interruption on pin B11 or B12 of the ECU

-

short circuit to supply on pin B11 or B12 of
the ECU

-

Rev counter gives no reading

-

Thermometer gives no reading

Communication problem via V-CAN on pin B12 of
the ECU due to:
-

short circuit to earth on pin B12 of the ECU

-

Rev counter gives no reading

Fault code

Fault code description with possible cause

Symptom