Fault code: 4351 SCANIA

Error identification:

There is no signal from either engine speed sensor.

Cause:

The fault can be due to that none of the speed sensors are connected or that both speed sensors are defective.

The fault code can be set when starting with a poor battery.

The fault can also arise if the starter motor is not connected to the control unit or if there is a fault on the control unit output to the starter motor.

Notes:

Fuel injection is switched off as long as there is no signal from either engine speed sensor.

Action:

If the engine turns when the starter motor is activated, check the engine speed sensors, harness-to-harness connectors and electrical cables.

If the engine does not turn when the starter motor is activated, check that the starter motor functions as it should.