Двигатели Scania четвёртой серии. Руководство - часть 145

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03:04-06

Fault code 1105

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 decrease 
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

03:04-06

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19

Fault code 1106

Fault

The signal from engine speed sensor 1 has been 
faulty since starting the engine.

Cause

The control unit has not been able to find a 
plausible signal from engine speed sensor 1.

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

Remarks

The engine will not start if the fault is active on 
both engine speed sensors.

Action

Check the engine speed sensors, connectors 
and wiring.

Fault code 1107

Fault

The signal from engine speed sensor 1 is 
missing.

Cause

The signal from the engine speed sensor has 
been missing for some time.

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.

Action

Check the engine speed sensor, connectors and 
wiring.

Fault codes

20

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03:04-06

Fault code 1200

Fault

When comparing the engine position engine 
speed sensor 1 and 2 supply different data.

Cause

The engine speed signals from engine speed 
sensor 1 and 2 have supplied conflicting data as 
to where in the working cycle the engine is.

Remarks

If there is only a fault code for one of the 
engine speed sensors, this may be due to the 
two cables for the engine speed sensor being 
mixed up.

If there is a fault code for both engine speed 
sensors the engine may have turned several 
revolutions backwards, e.g. if the engine stalled 
on a slope.

If the fault code is generated as soon as you try 
to start the engine, this may be due to the 
engine speed sensors being mixed up i.e. 
engine speed sensor 1 is in the engine speed 
sensor 2 position and vice versa.

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 sensors, connectors 
and wiring.

Fault codes

03:04-06

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21

Fault code 1201

Fault

The signal from engine speed sensor 2 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