This document is a Cummins 1117 fault code troubleshooting manual for power supply lost with ignition on diagnostics. It covers Fault Code 1117, PID S251, SPN 627, FMI 2, the ECM power supply circuit, fault conditions, repair checks, and final validation for Cummins ISB6.7 CM2350 engines.
Official Cummins 1117 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2350 (2013-17) |
| System/Group | DTCs; ECM power supply lost with ignition on |
| Publication no. | Not stated in extract |
| Year/Revision | Unknown; copyright 2017 shown |
| Pages | 10 |
| File size | 0.7 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code: 1117
- PID: S251
- SPN: 627
- FMI: 2
- LAMP: None
- Power Supply Lost with Ignition On – Data Erratic, Intermittent, or Incorrect
- Circuit Description
- Component Location
- Reason
- Effect
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Troubleshooting Steps
- Step 1A) Check for fault codes.
- Step 2A) Check the batteries and the power connector.
- Step 2B) Check the battery voltage.
- Step 3A) Inspect the harness and the ECM connector pins.
- Step 3B) Check for an open circuit in the battery power circuit.
- Step 3B-1) Verify that the OEM fuse is installed correctly.
- Step 3B-2) Check if the OEM fuse is blown.
- Step 3B-3) Check the add-on or the accessory wiring at the (+) terminal of the battery.
- Step 3C) Check the resistance of the battery supply circuit.
- Step 3D) Check the keyswitch input-to-ECM wire.
- Step 3E) Check the keyswitch input circuit.
- Step 4A) Check if an ECM calibration update is available.
- Step 4B) Disable the fault code.
Applicable truck models
This file applies to Cummins ISB6.7 CM2350 engines from the 2013-17 coverage group. The extract states that ECM battery location and OEM harness routing vary by original equipment manufacturer, so the technician must reference the appropriate OEM wiring diagram when troubleshooting circuits supplied by the OEM. For manufacturer information, visit Cummins official website.
Who needs this Cummins 1117 fault code manual
This Cummins 1117 fault code manual is for mechanics, fleet technicians, and workshop owners diagnosing intermittent ECM battery supply loss, incomplete ECM power-down, or active and inactive counts for Fault Code 1117. It supports checks for battery terminals, cranking voltage, ECM connector pins, OEM fuses, add-on wiring, battery supply resistance, keyswitch input wiring, calibration revisions, and fault clearing.
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