Fault code: EMS 4444 SCANIA

Error identification:

Permanent electrical fault in one or more of the injector solenoid valves or in the electrical cables to the injectors.

Cause:

Fault in the solenoid valve to one or more injectors or in the electrical cables to the injectors. A possible cause of the fault may be a short circuit to battery voltage in the electrical cables to the injectors.

Notes:

The fault only occurs when the engine is running. The control unit continuously tries to use the injectors irrespective of malfunctions.

The fault is on one or more of the connected injectors.

Action:

Run Safety precautions for the fuel system.

Disconnect the electrical cable connections both from the control unit and from the solenoid value on defective injectors.

Measure the resistance in the solenoid valve.

Measure the resistance between the solenoid valve s positive and negative terminal, respectively, and the cylinder block. The value obtained should be infinite resistance (∞ ohms).

Check the electrical cable pin connections in the switch to the control unit and the cable grommet in the cylinder head.

Measure the resistance between the positive cable and negative cable (disconnected from the injector and the control unit). The value obtained should be infinite resistance (∞ ohms).

Measure the resistance between the positive and negative cables, respectively, and the cylinder block. The value obtained should be infinite resistance (∞ ohms).

Connect the electrical cables to the engine control unit and measure the resistance between the positive or negative cable and the control unit earth. The obtained value must be infinite or very high resistance.

If the operating time since the fault code was generated exceeds 10 hours, drain the EGR cooler as there is a risk that condensed water will form in the air-cooled EGR cooler when the EGR system has been switched off. Drain according to the instructions in Workshop Manual, sub-group 01-65.

Check the relay circuit.

Check the injectors in the group.

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

After repair, start the engine to clear fault codes.