Cummins ISB6.7 CM2150 (2007-09) Fault Code: 1676 PID: SPN: 3249 FMI: 2 Aftertreatment Exhaust Gas Temperature 2 – Data Erratic, Intermittent, or Incorrect. The aftertreatment diesel particulate filter inlet temperature sensor is not changing with engine operating conditions.
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe™ Online for applicable fixes to the calibration stored in the ECM. If necessary, calibrate the ECM.
Possible causes:
1)Stuck in-range aftertreatment diesel particulate filter inlet temperature sensor
2)High resistance in the aftertreatment diesel particulate filter inlet temperature sensor signal or return wires.
Possible repairs:
1)If no short is found, replace the temperature sensor that is reading higher or lower than the other sensors.
2)Replace the aftertreatment diesel particulate filter inlet temperature sensor.
3)Replace the OEM harness.
4)Replace the aftertreatment harness.
5)Replace all interconnects.
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SERVICE MANUAL 3000 AND 4000 SERIES GEN 4 GENERATION – ALLISON
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