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Fault code: 4912 SCANIA

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Finding the fault code

Enter the fault code





Fault code 4912

For this fault code there are several descriptions depending on the system to which this code refers and its version or version of this system that is installed on the machine

EMS Engine Management System

Engine speed

Error identification:

The engine speed has exceeded a limit value for a certain period.


Cause:

The fault may be caused by a poor gear change or by fuel dilution of the oil.


Notes:

The exhaust brake has been activated to brake the engine speed. The maximum engine torque is reduced by approximately 30% as long as the fault is active. In addition, the engine s high idle speed is lower than usual.


Action:

Inform the driver of the risks of engine damage at high rotational speeds. Check that there are no fuel leaks.

EMS Engine Management System

Error identification

The engine speed sensor produces disruptions in the signal. The rotational speed sensor pulses are outside their anticipated range.


Cause:

The fault code may be generated when starting in extremely cold weather or with a poor battery.


Notes:

The rotational speed signal is extremely important for several engine control unit functions. If the rotational speed signal is incorrect, several other functions can get an incorrect signal, resulting in malfunction.


Action:

Check the rotational speed sensor, harness-to-harness connectors and electrical cables.

Check the battery voltage.

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