This Cummins ISB6.7 1139 document covers Fault Code 1139 for the ISB6.7 CM2350 engine family and explains the injector cylinder 1 diagnostic logic. It identifies SPN 651 FMI 7 with an amber lamp and describes a mechanical system not responding or out of adjustment condition related to injector timing or quantity.
Official Cummins ISB6.7 1139 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2350 (2013-17) |
| System/Group | DTCs; Injector Solenoid Driver Cylinder 1 |
| Publication no. | Fault Code: 1139; PID: S001; SPN: 651; FMI: 7 |
| Year/Revision | Unknown; copyright 2017 shown in file extract |
| Pages | 7 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- 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 an active fault code.
- Step 1B) Check for injector circuit fault codes.
- Step 2B) Perform a single cylinder cutout diagnostic test.
- Step 3B) Inspect the fuel rail pressure sensor and connector pins.
- Step 3C) Check the fuel rail pressure sensor circuit.
- Step 4A) Monitor Commanded Fuel Rail Pressure and Measured Fuel Rail Pressure.
- Step 4B) Measure the high-pressure fuel pump fuel drain flow.
- Step 4C) Check the fuel drain line restriction.
- Step 5A) Check if an ECM calibration update is available.
- Step 5B) Disable the fault code.
Applicable truck models
This file applies to Cummins ISB6.7 CM2350 engines in the 2013-17 coverage range shown in the document group. The extract does not list specific truck makes or chassis models; it focuses on the ECM, engine harness, pass-through connectors, internal injector harnesses, fuel rail pressure sensor, high-pressure fuel pump, fuel pump actuator, and OEM fuel drain lines. For current engine information, visit the Cummins official website.
Who needs this Cummins ISB6.7 1139 manual
Workshop technicians, diesel mechanics, and fleet repair managers need this manual when diagnosing Fault Code 1139, rough operation, engine knock, engine misfire, or a complaint that can be attributed to a single cylinder. The procedure uses a diagnostic tool to read codes, run a single cylinder cutout diagnostic test, monitor Commanded Fuel Rail Pressure and Measured Fuel Rail Pressure, inspect connector pins, check drain flow and restriction, and confirm ECM calibration status.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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