DAF 95XF. Manual — part 164

©

200438

1-9

UPEC fault codes

UPEC

DAVIE XD diagnostics manual

2

51-8

Conflict between position of idling switch and
output signal of potentiometer in accelerator
pedal sensor (F672) due to:
-

short circuit to supply on pin B16 of the ECU

-

short circuit between pin B17 and pin B25 of
the ECU

-

short circuit to earth on pin B17 of the ECU

-

moisture in connector connection

-

No response to accelerator pedal

-

Engine runs at increased idling speed

Conflict between position of idling switch and
output signal of potentiometer in accelerator
pedal sensor (F672) due to:
-

interruption on pin B17 and/or pin B25 of the
ECU

-

When the accelerator pedal is depressed
the idling speed of the engine increases
gradually.

52-8

After the ignition had been switched on, the brake
pedal was operated several times (20x) while the
accelerator pedal was still being operated

-

No noticeable system limitation

53-1

Short circuit to supply of vehicle speed signal of
MTCO (B525) on pin B29 of the ECU

-

Cruise control cannot be activated

-

Variable vehicle speed limitation function
cannot be activated

-

Engine brake can be activated with the
vehicle stationary

-

Control function for engine speed control
cannot be activated

53-2

Short circuit to earth of vehicle speed signal of
MTCO (B525) on pin B29 of the ECU

-

Cruise control cannot be activated

-

Variable vehicle speed limitation function
cannot be activated

-

Engine brake can be activated with the
vehicle stationary

-

Control function for engine speed control
cannot be activated

53-8

Unacceptable vehicle speed signal of MTCO
(B525) on pin B29 of the ECU due to:
-

interruption on pin B29

-

excessive vehicle speed for example due to
incorrectly programmed K factor in MTCO

-

loose pulse ring in gearbox

-

Cruise control cannot be activated

-

Variable vehicle speed limitation function
cannot be activated

-

Engine brake can be activated with the
vehicle stationary

-

Control function for engine speed control
cannot be activated

54-1

Too high a voltage on the atmospheric pressure
sensor in the ECU due to:
-

internal fault in ECU

-

No noticeable system limitation in UPEC

54-2

Too low a voltage on the atmospheric pressure
sensor in the ECU due to:
-

internal fault in ECU

-

No noticeable system limitation in UPEC

54-4

Internal ECU fault relating to the atmospheric
pressure sensor

-

No noticeable system limitation in UPEC

55-8

Frequency of speed signal of electronically
controlled fan clutch (B335) on pin B30 of the
ECU is too high due to:
-

mechanically blocked fan clutch

-

No noticeable system limitation in UPEC

Fault code

Fault code description with possible cause

Symptom

UPEC

1-10

©

200438

UPEC fault codes

2

DAVIE XD diagnostics manual

55-9

Unacceptable frequency of speed signal of
electronically controlled fan clutch (B335) on pin
B30 of the ECU in relation to engine speed due
to:
-

interruption on pin B30

-

short circuit to supply or to earth on pin B30

-

fan leakage

-

no supply voltage

-

Reduced engine power (coolant
temperature may increase excessively as a
result of which the coolant overheating
safety may be activated)

56-1

Irregular engine running detected by the ECU due
to:
-

fuel leak of injector pipe of cylinder 1

-

defective/clogged injector of cylinder 1

-

air in fuel system

-

internal leakage of pump unit of cylinder 1

-

clogged injector pipe of cylinder 1

-

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

-

Irregular engine running and reduced
engine power

56-2

Irregular engine running detected by the ECU due
to:
-

fuel leak of injector pipe of cylinder 5

-

defective/clogged injector of cylinder 5

-

air in fuel system

-

internal leakage of pump unit of cylinder 5

-

clogged injector pipe of cylinder 5

-

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

-

Irregular engine running and reduced
engine power

56-3

Irregular engine running detected by the ECU due
to:
-

fuel leak of injector pipes of cylinders 1 and 5

-

defective/clogged injectors of cylinders 1
and 5

-

air in fuel system

-

internal leakage of pump units of cylinders 1
and 5

-

clogged injector pipes of cylinders 1 and 5

-

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

-

Irregular engine running and reduced
engine power

56-4

Irregular engine running detected by the ECU due
to:
-

fuel leak of injector pipe of cylinder 3

-

defective/clogged injector of cylinder 3

-

air in fuel system

-

internal leakage of pump unit of cylinder 3

-

clogged injector pipe of cylinder 3

-

too low a combustion pressure in cylinder 3
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

©

200438

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

©

200438

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