DAF LF45, LF55 Series. Manual — part 63

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1-3

ECS-DC3 fault codes

ECS-DC3

DAVIE XD diagnostics manual

17

100 - 1

In the case of engine oil pressure and
temperature sensor (F647):
Engine oil pressure signal on pin A33 of the ECU
is too low due to:
-

incorrect supply voltage on engine oil
pressure and temperature sensor

-

too little engine oil in the oil sump

-

wrong/faulty engine oil pressure and
temperature sensor

-

high engine load with low engine speeds; if
this is the case the oil pressure may fall
below the threshold value of the engine
protection system if the engine is in poor
mechanical condition

Limitation of maximum engine torque and
maximum engine speed.

In the case of control switch for engine oil
pressure (F011):
Engine oil pressure signal on pin A15 of the ECU
is too high (engine oil pressure is low) due to:
-

faulty control switch for engine oil pressure

-

short circuit between pin A09 and pin A15 of
the ECU

-

short circuit to supply on pin A15 of the ECU

-

too little engine oil in the oil sump

Limitation of maximum engine torque and
maximum engine speed.

100 - 3

Voltage on signal pin A33 of the ECU for the
engine oil pressure and temperature sensor
(F647) is higher than expected due to:
-

faulty engine oil pressure and temperature
sensor

-

short circuit to supply on pin 33 of the ECU

-

interruption on pin A19 of the ECU

-

short circuit between pin A09 and pin A33 of
the ECU

-

wrong/faulty engine oil pressure and
temperature sensor

The ECU continues its calculations with a default
replacement value for the lubricating oil pressure.

Fault code

Fault code description with possible cause

Symptom

ECS-DC3

1-4

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ECS-DC3 fault codes

17

DAVIE XD diagnostics manual

100 - 4

In the case of engine oil pressure and
temperature sensor (F647):
Low voltage on signal pin A33 of the ECU for the
engine oil pressure and temperature sensor due
to:
-

faulty engine oil pressure and temperature
sensor

-

interruption on pin A09 and/or pin A33 of the
ECU

-

short circuit to earth on pin A09 and/or pin
A33 of the ECU

-

short circuit between pin A09 and pin A19 of
the ECU

-

short circuit between pin A33 and pin A19 of
the ECU

-

wrong/faulty engine oil pressure and
temperature sensor (F647)

The ECU continues its calculations with a default
replacement value for the lubricating oil pressure.

In the case of control switch for engine oil
pressure (F011):
Voltage on signal pin A15 of the ECU for control
switch for engine oil pressure is low (engine oil
pressure is high) while the engine is not running,
due to:
-

faulty control switch for engine oil pressure

-

incorrect supply voltage on control switch for
engine oil pressure (F011)

-

interruption on pin A09 and/or A15 of the
ECU

-

short circuit to earth on pin A09 and/or pin
A15 of the ECU

No noticeable system limitation in ECS-DC3.

100 - 18

In the case of engine oil pressure and
temperature sensor (F647):
Engine oil pressure signal on pin A33 of the ECU
is below the threshold value of the engine
protection system due to:
-

incorrect supply voltage on engine oil
pressure and temperature sensor

-

high engine load with low engine speeds; if
this is the case the oil pressure may fall
below the threshold value of the engine
protection system if the engine is in poor
mechanical condition

-

too little engine oil in the oil sump

Limitation of maximum engine output and
maximum engine speed.

In the case of control switch for engine oil
pressure (F011):
Engine oil pressure signal on pin A15 of the ECU
is too high (engine oil pressure is low) due to:
-

faulty control switch for engine oil pressure

-

short circuit between pin A09 and pin A15 of
the ECU

-

short circuit to supply on pin A15 of the ECU

-

too little engine oil in the oil sump

Limitation of maximum engine torque and
maximum engine speed.

Fault code

Fault code description with possible cause

Symptom

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1-5

ECS-DC3 fault codes

ECS-DC3

DAVIE XD diagnostics manual

17

102 - 2

Boost pressure sensor signal (F649), the signal
on pin A28 of the ECU, is high while other engine
parameters (e.g. speed and load) indicate that it
should be low, due to:
-

incorrect supply voltage on inlet air boost
pressure and temperature sensor

-

interruption(s) or contact resistance(s) in the
wiring between the inlet air boost pressure
and temperature sensor and the ECU

-

oil in intercooler and/or defective
turbocompressor oil seals

Reduced engine output.

102 - 3

Voltage on pin A28 of the ECU for boost pressure
sensor (F649) is too high due to:
-

incorrect supply voltage on inlet air boost
pressure and temperature sensor

-

short circuit to supply on pin A28 of the ECU

-

interruption on pin A21 of the ECU

-

short circuit between pin A10 and pin A28 of
the ECU

-

incorrectly installed turbocompressor

Reduced engine output.

102 - 4

Voltage on signal pin A28 of the ECU for boost
pressure sensor (F649) is too low due to:
-

incorrect supply voltage on inlet air boost
pressure and temperature sensor

-

interruption on pin A10 and/or A28 of the
ECU

-

short circuit to earth on pin A10 and/or A28
of the ECU

-

short circuit between pin A10 and pin A21 of
the ECU

-

short circuit between pin A28 and pin A21 of
the ECU

-

incorrectly installed turbocompressor

Possibly reduced engine output.

105 - 0

Inlet air temperature signal, the signal on pin A29
of the ECU, indicates that the inlet air
temperature is above the threshold value of the
engine protection system due to:
-

contaminated intercooler

-

wrong/faulty inlet air boost pressure and
temperature sensor (F649)

Limitation of maximum engine output and
maximum engine speed.

105 - 3

Voltage on pin A29 of the ECU for inlet air
temperature is too high due to:
-

wrong/faulty inlet air boost pressure and
temperature sensor (F649)

-

interruption in wiring on pin A21 and/or pin
A29 of the ECU

-

short circuit between pin A10 and pin A29 of
the ECU

The ECU continues its calculations with a default
replacement value for the inlet air temperature.

105 - 4

Low voltage or short circuit to earth on signal pin
A29 of the ECU for inlet air temperature due to:
-

wrong/faulty inlet air boost pressure and
temperature sensor (F649)

-

short circuit to earth on pin A29 of the ECU

-

short circuit between pins A21 and A29 of
the ECU

ECU switches to default replacement value.

Fault code

Fault code description with possible cause

Symptom

ECS-DC3

1-6

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ECS-DC3 fault codes

17

DAVIE XD diagnostics manual

105 - 16

Inlet air temperature value, the signal on pin A29
of the ECU, is above the threshold value of the
engine protection system due to:
-

contaminated intercooler

-

wrong/faulty inlet air boost pressure and
temperature sensor (F649)

Limitation of maximum engine torque and
maximum engine speed.

108 - 11

Incorrect atmospheric air pressure sensor signal
due to:
-

internal fault in ECU (D903); the
atmospheric air pressure sensor is in the
ECU

Blacker exhaust smoke. Limitation of maximum
engine torque and maximum engine speed.

110 - 0

Coolant temperature signal, the signal on pin A36
of the ECU, is above the threshold value of the
engine protection system due to:
-

fouled radiator

-

faulty thermostat

Possible limitation of maximum engine torque
and maximum engine speed.

110 - 3

Voltage on pin A36 of the ECU for engine coolant
temperature sensor (F566) is too high due to:
-

faulty engine coolant temperature sensor

-

interruption in wiring of pin A18 and/or A36
of the ECU

Longer start time before engine fires.
No temperature indication on coolant
temperature gauge on DIP.

110 - 4

Voltage on signal pin A36 of the ECU for engine
coolant temperature sensor (F566) is too low due
to:
-

faulty engine coolant temperature sensor

-

short circuit to earth on pin A36 of the ECU

-

short circuit between pin A36 and pin A18 of
the ECU

Longer start time before engine fires.
No temperature indication on coolant
temperature gauge on DIP.

110 - 16

Engine coolant temperature signal (F566), via pin
A36 of the ECU, is way above the threshold value
of the engine protection system due to:
-

faulty engine coolant temperature sensor

-

fouled radiator

-

faulty thermostat

Limitation of maximum engine output and
maximum engine speed.

157 - 3

Voltage on signal pin A27 of the ECU for fuel rail
pressure sensor (F648) is too high due to:
-

faulty rail pressure sensor

-

short circuit to supply on pin A27 of the ECU

-

interruption on pin 20 of the ECU

-

short circuit between pin A12 and pin A27 of
the ECU

Limitation of maximum engine output and
maximum engine speed. Loud combustion
knocking.

157 - 4

Low voltage or short circuit to earth on signal pin
A27 of the ECU for fuel rail pressure sensor
(F648) due to:
-

faulty rail pressure sensor

-

interruption on pin A12 and/or A27 of the
ECU

-

short circuit to earth on pin A12 and/or A27
of the ECU

-

short circuit between pin A12 and pin A20 of
the ECU

-

short circuit between pin A27 and pin A20 of
the ECU

Limitation of maximum engine output and
maximum engine speed. Loud combustion
knocking.

Fault code

Fault code description with possible cause

Symptom