Fault code: EMS 49666 SCANIA

Error identification:

It has taken longer than expected for the control unit to build up the current in the solenoid valve. The control unit uses the battery voltage and the engine temperature to calculate how long it should take to build up the current.

Cause:

The fault is due to resistance being too high, which can be due to:

• Open circuit between the control unit and the solenoid valve.

• Damaged electrical cables.

• Open circuit internally in the control unit.

Notes:

The control unit attempts to get the engine to continue using the faulty cylinder as long as possible. If fault codes are generated for more than one cylinder, maximum engine torque will be reduced by approx. 30%.

Action:

Check the circuit components, harness-to-harness connectors and electrical cables.

Check the resistance of the solenoid valve. Resistance should be 0.4 – 0.6 ohms. Also check the resistance between the solenoid valve connection and the engine. If the resistance is below 100 ohms, there is probably a short circuit.

Clear the fault code memory.

If the fault remains, first renew the unit injector and if necessary the control unit.