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Cummins ISX CM870 (2003-06) Fault Code: 341 PID: S253 SPN: 630 FMI: 2/2 Engine control module (ECM) data lost.

The ECM is connected to the battery by the ECM power harness. This direct link provides a constant power supply for the ECM. The location of the battery will vary with the OEM.

Possible repairs:

1)Charge or replace the battery.
2)Repair or replace the OEM harness.
3)Install the fuses correctly.

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