This fault code 516 DTCs document is a troubleshooting manual for the Sensor Supply 6 Circuit on CM2250 engines. It explains the low-voltage or short-to-low-source condition affecting the 5-VDC supply to the fuel rail pressure sensor and the related amber warning lamp, MIL behavior, and engine power derate.
Official fault code 516 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 – Voltage Below Normal or Shorted to Low Source |
| Publication no. | 4022254 for ISB6.7 CM2250; associated bulletins also list 4022257, 4022250, 2883445, 4022256, and 4022255 |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 20-Jul-2010 |
| Pages | 10 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- 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 sensors and circuits connected to the sensor supply and return.
- Guided Step 3 – Check the ECM.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins CM2250 engine families listed in the procedure tables, including ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. The diagnostic centers on sensor supply 6, which is located in the ECM and provides a 5 volt supply to the fuel rail pressure sensor only. The procedure uses INSITE™ electronic service tool checks, fuel rail pressure sensor connector inspection, ECM connector inspection, engine wiring harness checks, calibration review, and fault clearing validation. More engine and service information is available from Cummins official website.
Who needs this fault code 516 DTCs manual
Workshop technicians, fleet mechanics, and diagnostic specialists need this manual when an active or intermittent Fault Code 516 appears with SPN 3514 and FMI 4/4. It helps separate a failed fuel rail pressure sensor, damaged harness, connector damage, short to ground, short to return, ECM power supply concern, or calibration issue.
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