Fault code: EMS 4608 SCANIA

Error identification:

The engine speed signals from the two engine speed sensors have supplied conflicting data as to where in the working cycle the engine is.

Cause:

If fault code 4608 has been registered but not fault code 4352, this may be because the cables to one of the engine speed sensors are mixed up. The control unit cannot determine which one.

If, however both fault code 4608 and fault code 4352 have been registered, this may be because the engine has turned several revolutions backwards, e.g. if the engine stalled when driving uphill.

If fault codes 4608 and 4352 are generated when you try to start the engine, this may be due to the engine speed sensors being mixed up.

Notes:

If fault code 4608 has been registered but not fault code 4352, the maximum engine torque is reduced by 30% as long as the fault is active. In addition, the engine s high idle speed is lower than usual.

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

Action:

Check sensors, harness-to-harness connectors and electrical cables.