Двигатели Scania четвёртой серии. Руководство — часть 147
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Fault code 1206
Fault
The signal from engine speed sensor 2 has been
faulty from the beginning.
Cause
The control unit has not been able to locate a
plausible signal from engine speed sensor 2.
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 1207
Fault
The signal from engine speed sensor 2 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 sensors, connectors
and wiring.
Fault codes
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Fault code 2000
Fault
The voltage has been above 4.90 V (below -
40°C), i.e. the coolant temperature was below
its lower limit.
Cause
The voltage between pin 1 and 2 in connector
A7 is too high.
Remarks
If the voltage is outside the permitted range, the
control unit uses a pre-programmed
temperature value (60°C).
The idle speed cannot be adjusted as long as
the fault is active.
A cold engine results in poor starting and
uneven idle speed.
Action
Check the signal from the coolant temperature
sensor.
Check that the coolant and charge air are about
the same temperature when the engine is cold.
Measure the resistance of the coolant
temperature sensor.
Check any visible faults on the coolant
temperature sensor, connectors and wiring.
Then, erase the fault code memory and check
whether the fault code is generated again.
Fault codes
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Fault code 2001
Fault
The voltage has been below 0.44 V (above
130°C), i.e. the coolant temperature was above
its upper limit.
Cause
The voltage between pin 1 and 2 in connector
A7 is too low.
Remarks
If the voltage is outside the permitted range, the
control unit uses a pre-programmed
temperature value (60°C).
The idle speed cannot be adjusted as long as
the fault is active.
A cold engine results in poor starting and
uneven idle speed.
Action
Check the signal from the coolant temperature
sensor.
Check that the coolant and charge air are about
the same temperature when the engine is cold.
Measure the resistance of the coolant
temperature sensor.
Check any visible faults on the coolant
temperature sensor, connectors and wiring.
Then, erase the fault code memory and check
whether the fault code is generated again.
Fault codes
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Fault code 2002
Fault
Internal fault in the control unit.
Cause
The control unit could not process (convert) the
signal from the coolant temperature sensor.
Remarks
If the fault arises, the control unit uses a pre-
programmed temperature value (60°C).
The idle speed cannot be adjusted as long as
the fault is active.
A cold engine results in poor starting and
uneven idle speed.
Action
Clear the fault code memory. Start the engine
and accelerate the engine to full speed.
If the fault code is regenerated, renew the
control unit.
Fault codes
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