Cummins ISL CM850 (2003-06) Fault Code: 343 PID: SID 254 SPN: 629 FMI: 12 Engine Control Module Warning Internal Hardware Failure - Bad Intelligent Device or Component.

This fault code can only be caused by an internal ECM problem. Repairs are not possible for the ECM.

For Euro certified engines this fault code indicates that the Real Time Clock feature needs to re reset (if equipped).

Possible repairs:

1)Replace the ECM.

Cummins ISL CM850 (2003-06) Fault Code: 342 PID: SID 253 SPN: 630 FMI: 13 Electronic Calibration Code Incompatibility - Out of Calibration. An incompatable calibration between the primary and secondary OEM installed ECM's has been detected.

Cummins ISL CM850 (2003-06) Fault Code: 341 PID: SID 253 SPN: 530 FMI: 2 Engine Control Module Data Lost - Data Erratic, Intermittent or Incorrect. Severe loss of data from the ECM.

Cummins ISL CM850 (2003-06) Fault Code: 334 PID: 110 SPN: 110 FMI: 2 Engine Coolant Temperature - Data Erratic, Intermittent, or Incorrect. The engine coolant temperature reading is not changed with engine operating conditions.

Cummins ISL CM850 (2003-06) Fault Code: 332 PID: SID 4 SPN: 654 FMI: 5 Injector Solenoid Driver Cylinder 4 Circuit - Current Below Normal or Open Circuit. High resistance or no current detected at number 4 injector driver or RETURN pin.

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