Cummins ISB CM850 (2003-06) Fault Code: 1712 PID: SPN: 3363 FMI: 1 Catalyst Tank Heater Circuit ? Data Valid But Below Normal Operating Range ? Moderately Severe Level. The catalyst solution temperature did not increase when the catalyst tank heater was commanded on.

Cummins ISB CM850 (2003-06) Fault Code: 1712 PID: SPN: 3363 FMI: 1 Catalyst Tank Heater Circuit ? Data Valid But Below Normal Operating Range ? Moderately Severe Level. The catalyst solution temperature did not increase when the catalyst tank heater was commanded on.

This fault code is triggered when the catalyst tank heater is commanded on by the engine ECM, but no corresponding temperature increase in the catalyst tank temperature was recorded by the catalyst temperature sensor.

Possible causes:

1)Failed catalyst tank heater relay
2)Faulty power supply to the catalyst tank heater
3)Faulty ground circuit to the catalyst tank heater
4)Faulty wiring between the catalyst tank heater relay and the catalyst tank heater
5)Failed catalyst tank heater.

On-Board Diagnostics (OBD) Information (Euro 4 Certified Engines):

1)The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
2)The ECM turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. The MIL lamp and fault code can also be cleared using the INSITE? service tool.
3)The fault code will be cleared from memory after 40 consecutive drive cycles where the diagnostic runs and passes.

On-Board Diagnostics (OBD) Information (Euro 4 Stage 1+ Certified Engines):

1)The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
2)An engine torque derate will be activated after 50 hours of engine operation with the fault code active.
3)The ECM turns OFF the malfunction indicator lamp (MIL) after 1 ignition cycle that the diagnostic runs and does not fail. The MIL lamp cannot be cleared using the INSITE? service tool.
4)The fault code will be cleared from memory after 400 days or 9600 hours of engine operation.

Possible repairs:

1)Repair or replace the OEM wiring to the catalyst tank heater relay.
2)Repair or replace the OEM wiring between the catalyst tank heater relay and the catalyst tank heater.
3)Replace the catalyst tank heater relay.