Cummins ISB CM850 (2003-06) Fault Code: 1713 PID: SPN: 3363 FMI: 0 Catalyst Tank Heater Circuit – Data Valid But Above Normal Operating Range – Moderately Severe Level. The catalyst tank heater is continuously in the on position.

This fault code is triggered when the catalyst tank heater is determined to be in the on position when the engine ECM is commanding the heater to be in the off position. To determin if the temperature sensors are reading a sensible value, they can be compared to each other at keyswitch ON, after an 8-hour period with the engine not running. At this point, the engine TMAP sensor should display a similar temperature to the tank. For example: ambient air temperature.

Possible causes:

1)Damaged catalyst solution OEM tank temperature/level sensor
2)Damaged catalyst solution tank heater relay
3)Failed ECM that is commanding the heater on continuously.

On-Board Diagnostics (OBD) Information:

1)The ECM illuminates the appropriate amber or red fault code lamp when the diagnostic runs and fails
2)The ECM turns OFF the appropriate fault lamp when the diagnostic runs and passes.

Possible repairs:

1)Replace the catalyst solution tank heater relay.
2)Replace the wiring harness.
3)Replace the ECM.
4)Replace the catalyst tank heater relay.