DAF LF45, LF55 Series. Manual — part 65

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1-11

ECS-DC3 fault codes

ECS-DC3

DAVIE XD diagnostics manual

17

654 - 7

Incorrect mechanical response from cylinder 4
injector (B134) due to:
-

faulty injector

-

internal fuel leakage

-

leakage in fuel supply system (high
pressure) to injector

Longer start time before engine fires.
Irregular engine running and reduced engine
output.

654 - 11

Short circuit in injector(s) of cylinder row #2,
cylinders 2, 4 and 6 in case of a CE engine,
cylinders 2 and 4 in case of a BE engine,
due to:
-

short circuit to earth or short circuit in the
injector wiring

-

engine having been switched off at an
engine speed over 1300 rpm

Longer start time before engine fires.
Irregular engine running and reduced engine
output.
Cylinder row is deactivated as long as the ignition
is still on. When the cause has been removed, the
cylinder row is only activated again when the
ignition has been switched off for about 10
seconds.

654 - 13

Pre-injection overlaps the beginning of main
injection due to:
-

defective ECU (D903)

Loud combustion knocking.

655 - 5

Measured current strength from cylinder 5
injector (B135) is too low. This is the current
between pins C11 and C16 of the ECU,
caused by:
-

interruption in injector wiring

-

bad connection point at injector

Irregular engine running and reduced engine
output.

655-7

Incorrect mechanical response from cylinder 5
injector (B135) due to:
-

faulty injector

-

internal fuel leakage

-

leakage in fuel supply system (high
pressure) to injector

Longer start time before engine fires.
Irregular engine running and reduced engine
output.

656 - 5

Measured current strength from cylinder 6
injector (B136) is too low. This is the current
between pins C10 and C15 of the ECU,
caused by:
-

interruption in injector wiring

-

bad connection point at injector

Irregular engine running and reduced engine
output.

656-7

Incorrect mechanical response from cylinder 6
injector (B136) due to:
-

faulty injector

-

internal fuel leakage

-

leakage in fuel supply system (high
pressure) to injector

Longer start time before engine fires.
Irregular engine running and reduced engine
output.

723 - 2

No signal from camshaft sensor due to:
-

faulty/soiled camshaft sensor (F558)

-

too large an air gap between camshaft
sensor and camshaft gear

-

short circuit, short circuit to supply, short
circuit to earth, contact resistance(s) or
interruption in wiring on pin A23 and/or pin
A30

Longer start time before engine fires.

723 - 7

Crankshaft sensor and camshaft sensor signals
do not correspond due to:
-

incorrect timing

-

short circuit or interruption in wiring

-

faulty/soiled crankshaft/camshaft sensor
(F552/F558)

-

Engine starts but will not fire.

-

Longer start time before engine fires.

-

Irregular engine running and reduced
engine output.

Fault code

Fault code description with possible cause

Symptom

ECS-DC3

1-12

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ECS-DC3 fault codes

17

DAVIE XD diagnostics manual

729 - 11

Fault in glow element circuit due to:
-

short circuit, short circuit to earth, short
circuit to supply, contact resistance(s) or
interruption in wiring to pin B16 of the ECU

-

faulty glow relay (G014)

Depending on the cause:
-

glow function cannot be activated

-

glow function is permanently activated

854-4

Low voltage or short circuit to earth on signal pin
B18 of the ECU for fuel heating (B182) due to:
-

faulty fuel heating element

-

short circuit to earth on pin B18 of the ECU

-

short circuit between pin B02 and pin B18 of
the ECU

Fuel heating is not activated.

974 - 3

Voltage on remote throttle circuit, signal pin B85,
is too high due to:
-

faulty remote throttle potentiometer

-

short circuit to supply on pin B85 of the ECU

-

interruption on pin B50 of the ECU

-

short circuit between pin B85 and pin B68 of
the ECU

Possibly the engine does not respond to remote
throttle operation.

974 - 4

Short circuit to earth on remote throttle circuit,
signal pin B85, or voltage is too low due to:
-

faulty remote throttle potentiometer

-

interruption on pin B85 and/or pin B68 of the
ECU

-

short circuit to earth on pin B85 and/or pin
B68 of the ECU

-

short circuit between pin B50 and pin B68 of
the ECU

-

short circuit between pin B50 and pin B85 of
the ECU

Possibly the engine does not respond to remote
throttle operation.

1073 - 11

Fault in exhaust brake circuit due to:
-

short circuit or interruption in wiring to pin
B11 of the ECU

-

short circuit or interruption in the coil of
exhaust brake valve (B192)

-

Exhaust brake cannot be activated.

-

Exhaust brake is permanently activated.

1077 - 14

Fuel rail pressure cannot be maintained at
maximum pump output (fuel pump control
solenoid valve fully opened) due to:
-

external fuel leakage of the fuel system's
high-pressure circuit

-

internal leakage of the fuel system's high-
pressure circuit due to:
-

bad sealing of rail pressure limiting
valve

-

injector(s) with excessive internal
leakage

-

leaking fuel supply line(s) to the
injector(s)

-

jammed plunger of fuel pump control
solenoid valve (B334)

-

defective fuel pump (capacity too low)

-

Engine starts but will not fire.

-

Longer start time before engine fires.

-

Possibly a delayed engine response when
operating the accelerator pedal when much
power is required.

Fault code

Fault code description with possible cause

Symptom

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1-13

ECS-DC3 fault codes

ECS-DC3

DAVIE XD diagnostics manual

17

1079 - 3

Voltage on inlet air boost pressure and
temperature sensor (F649) supply wire, pin A10,
is too high due to:
-

short circuit to supply on wiring to pin A10 of
the ECU or the power supply to the remote
throttle potentiometer, pin B68, of the ECU

-

incorrect ECU (D903) power supply

Reduced engine output.
The engine does not respond to remote throttle
operation, if applicable.

1079 - 4

Voltage on inlet air boost pressure and
temperature sensor (F649) supply wire, pin A10,
is too low due to:
-

short circuit to earth on wiring to pin A10 of
the ECU or the power supply to the remote
throttle potentiometer, pin B68, of the ECU

-

incorrect ECU (D903) power supply

-

short circuit to earth in inlet air boost
pressure and temperature sensor (F649)

-

short circuit to earth in remote throttle
potentiometer

Reduced engine output.
The engine does not respond to remote throttle
operation, if applicable.

1080 - 3

Voltage on fuel rail pressure sensor (F648)
supply wire, pin A12, is too high due to:
-

short circuit to supply on pin A12 of the ECU

-

incorrect ECU (D903) power supply

Reduced engine output.

1080 - 4

Voltage on fuel rail pressure sensor (F648)
supply wire, pin A12, is too low due to:
-

faulty rail pressure sensor

-

short circuit to earth on pin A12 of the ECU

-

incorrect ECU (D903) power supply

Reduced engine output.

1081 - 3

Voltage on accelerator pedal (F671) power
supply, pin B55 of the ECU, is too high due to:
-

faulty accelerator pedal position sensor

-

short circuit to supply in wiring to pin B55 of
the ECU

-

incorrect ECU (D903) power supply

Indistinct or no response to accelerator pedal.

1081 - 4

Voltage on accelerator pedal (F671) power
supply, pin B55 of the ECU, is too low due to:
-

faulty accelerator pedal position sensor

-

short circuit to earth in wiring to pin B55 of
the ECU

-

incorrect ECU (D903) power supply

Indistinct or no response to accelerator pedal.

1347 - 5

Current measured in the fuel pump control
solenoid valve (B334) circuit is too low due to:
-

interruption in wiring to pin B05 and/or pin
B07 of the ECU

-

fuel pump control solenoid valve connector
connected incorrectly or not at all

-

interruption in magnet coil of fuel pump
control solenoid valve

Irregular engine running and reduced engine
output.
Loud combustion knocking.

1347 - 6

Current measured in the fuel pump control
solenoid valve (B334) circuit is too high due to:
-

short circuit to earth in wiring to pin B05 and/
or pin B07 of the ECU

-

short circuit in wiring to pin B05 and/or pin
B07 of the ECU

-

short circuit in magnet coil of fuel pump
control solenoid valve

-

Engine starts but will not fire.

-

Longer start time before engine fires.

-

Reduced engine output.

Fault code

Fault code description with possible cause

Symptom

ECS-DC3

1-14

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ECS-DC3 fault codes

17

DAVIE XD diagnostics manual