Двигатели Scania четвёртой серии. Руководство — часть 144

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03:04-06

Fault code 1101

Fault

The signal from engine speed sensor 1 is too
low.

Cause

The engine speed signal is below the level it
ought to be at for the current engine speed.

The fault code may be due to the distance
between the sensor and the flywheel being too
great.

The control unit increases the sensitivity of the
sensor to avoid more fault codes. Therefore, the
fault code will not be regenerated even if the
fault still remains. This increase in the
sensitivity of the sensor may lead to other fault
codes being generated. These fault codes can
be ignored.

The control unit can increase the sensitivity of
the sensor in two stages. The automatic
adjustment by the control unit does not affect
the function of the control unit in any way.

Remarks

The fault does not affect the operation of the
engine, i.e. no limited power output.

Action

If the fault has occurred more than twice, check
the engine speed sensor, the distance between
the engine speed sensor and the flywheel
(maximum 1.5 mm permitted), also check the
connectors and wiring.

Fault codes

03:04-06

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15

Fault code 1102

Fault

Open circuit in the signal from engine speed
sensor 1.

Cause

The signal from engine speed sensor 1 has
indicated an implausible engine speed increase
during the time the control unit waited for the
space in the pulse pattern to pass.

If the fault code for no signal, fault code 1107,
has been generated at the same time, then the
signal must have been absent for several engine
rotations, otherwise the fault is due to a
temporary disturbance.

This fault code can be generated when starting
in extreme cold or when starting with a poor
battery.

Remarks

If one of the engine speed sensors is faulty the
maximum torque is reduced by approximately
30% (as long as the fault is active) and the high
idling speed is reduced.

If both engine speed sensors are faulty the
engine will shut down.

Action

Check the engine speed sensor, connectors and
wiring.

Fault codes

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03:04-06

Fault code 1103

Fault

Disturbance of the signal from engine speed
sensor 1.

Cause

The signal from engine speed sensor 1 has
indicated an implausible engine speed increase
during the time the control unit waited for the
space in the pulse pattern to pass.

If the fault code for no signal, fault code 1107,
has been generated at the same time, then the
signal must have been absent for several engine
rotations, otherwise the fault is due to a
temporary disturbance.

This fault code can be generated when starting
in extreme cold or when starting with a poor
battery

Remarks

If one of the engine speed sensors is faulty the
maximum torque is reduced by approximately
30% (as long as the fault is active) and the high
idling speed is reduced.

If both engine speed sensors are faulty the
engine will shut down.

Action

Check the engine speed sensor, connectors and
wiring.

Fault codes

03:04-06

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17

Fault code 1104

Fault

Disturbance of the signal from engine speed
sensor 1.

Cause

The signal from engine speed sensor 1 has
indicated an implausible engine speed increase
between two subsequent pulses.

If the fault code for no signal, fault code 1107,
has been generated at the same time, then the
signal must have been absent for several engine
rotations, otherwise the fault is due to a
temporary disturbance.

This fault code can be generated when starting
in extreme cold or when starting with a poor
battery

Remarks

If one of the engine speed sensors is faulty the
maximum torque is reduced by approximately
30% (as long as the fault is active) and the high
idling speed is reduced.

If both engine speed sensors are faulty the
engine will shut down.

Action

Check the engine speed sensor, connectors and
wiring.

Fault codes