Cummins ISC CM2150 (2007-09) Fault Code: 698 PID: 21 SPN: 1136 FMI: 4 ECM Internal Temperature Sensor Circuit - Voltage Below Normal or Shorted to Low Source. Low signal voltage or an open circuit detected at the internal ECM temperature sensor.
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, recalibrate the ECM.
This sensor is located internally to the ECM. No troubleshooting is possible for this fault code. If the fault code is active, the ECM must be replaced.
Possible repairs:
1)Replace the ECM.
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