This document is a fault code 515 DTCs troubleshooting file for the sensor supply 6 circuit on CM2250 engines. It explains the high-voltage or short-to-high-source fault affecting the 5-VDC supply to the fuel rail pressure sensor, including lamp action, derate effect, INSITE checks, ECM connector inspection, harness repair direction, calibration review, and clearing conditions.
Official fault code 515 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Sensor Supply 6 Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250; associated bulletin numbers also include 4022257, 4022250, 2883445, 4022256, and 4022255 |
| Year/Revision | Last Modified: 11-Jun-2010 and 20-Jul-2010 |
| Pages | 8 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Fault Code: 515
- 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
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the ECM.
- Guided Step 3 – Check ECM calibration and clear fault codes.
Applicable truck models
The procedure applies to Cummins CM2250 engine families listed in the file, including ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. The fault concerns sensor supply 6, a dedicated 5 volt ECM supply for the fuel rail pressure sensor; the document states that high voltage can be caused by a short to battery voltage in the engine harness or connectors, or by a malfunctioning ECM. For manufacturer information, visit Cummins official website.
Who needs this fault code 515 DTCs manual
This manual is for diesel mechanics, fleet technicians, and workshop owners diagnosing an active or intermittent Sensor Supply 6 Circuit – Voltage Above Normal or Shorted to High Source fault. It is useful when checking INSITE fault status, ECM connector condition, engine harness damage, calibration revision, and fault clearing after repair.
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