Fault code: EMS 57088 SCANIA

Error identification:

The torque on the front bank, cylinders 1-3, is too high in comparison with the rear bank, cylinders 4-6.

Cause:

The fault may be due to one of the solenoid valves for fuel volume or injection timing causing incorrect engine torque for one bank. This may be caused by:

• One of the solenoid valves on the front bank providing too much fuel (torque too high) to cylinders 1-3.

• One of the solenoid valves on the rear bank providing too little fuel (torque too low) to cylinders 4-6.

If the engine gives a higher output than normal just before the fault code is generated, there is probably a fault with one of the solenoid valves on the front bank.

If the engine gives a lower output than normal just before the fault code is generated, there is probably a fault with one of the solenoid valves on the rear bank.

The fault code may also be generated even if there is no fault on any of the solenoid valves. In some cases the fault code was caused by defective unit injectors or oscillations in the powertrain due to the driving conditions.

Notes:

The engine may run unevenly.

The maximum engine torque is reduced by 30% to protect the engine.

The fault must be present for six seconds for the fault code to be generated. If the fault disappears, the engine will function normally again after three seconds.

Action:

To determine whether one of the solenoid valves is causing the fault, proceed as follows: Change over the solenoid valves so that both solenoids on the front bank are fitted on the rear bank and vice versa. Test drive the vehicle. Put the engine under load by driving at full load.

If fault code 57090 has now been set, then one of the solenoid valves is probably the cause. Renew the solenoid valves on one bank. Clear the fault code memory. Test drive the vehicle. Put the engine under load by driving at full load.

If the fault remains, renew the solenoid valves on the other bank.

To see whether there is something wrong with one of the unit injectors, look at cylinder balancing in Scania Diagnos.