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√ Power Supply - Data Erratic, Intermittent or Incorrect (Fault Code: SPN 627 - FMI 2)

SPN627 FMI2 (Cummins QSB3.3)

Figure 1.1 - Power Supply Lost with Ignition On (SPN 627 - FMI 2)


SPN 627 - FMI 2
Power Supply Lost With Ignition On - Data Erratic, Intermittent, or Incorrect.

1). Connecting Adapter Tools (Nexiq USB-Link) to diagnostic port on Cummins Engine. Read More: How to Connecting CUMMINS Engines using Cummins INSITE Software. But in this case, I tried to connecting using "JPRO Commercial Vehicle Diagnostic" Software.

2). Once connected to the ECM, open "Active Faults" on Faults Status.
Figure 1.2 - 1 Active Fault Present (SPN 627 - FMI 2)

3). Troubleshooting: click on "Active" Status for "Fault Status Lookup Assistance Active".
Figure 1.3 - Fault Status Lookup Assistance Active

4). Details the Error Code: SPN 627 - FMI 2. Read More: SPN 627 - FMI 2 (Fault Code 1117).
Power Supply Lost With Ignition On - Data Erratic, Intermittent, or Incorrect. Supply voltage to the
ECM fell below +6.2-VDC momentarily, or the ECM was not allowed to power down correctly (retain battery voltage for 30 seconds after key OFF).

5). Fault Codes on Cummins INSITE Software;
Advanced ECM Data on Cummins INSITE Software (CUMMINS Engines)