This Cummins ISB6.7 1239 manual is a 13-page diagnostic PDF for Fault Code 1239 on CM2150 engines. It explains the accelerator pedal or lever position sensor 2 circuit fault, the ECM response, possible causes, and guided checks using INSITE™ electronic service tool.
Official Cummins ISB6.7 1239 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL with CM2150; ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; Accelerator Pedal Sensor |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 13 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- FAULT CODE 1239
- 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 accelerator pedal position sensor and circuit.
- Guided Step 3 – Check the ECM and OEM harness.
- Guided Step 4 – Clear the fault code.
Applicable truck models
This document applies to Cummins ISB, ISC, and ISL engines with CM2150 controls, including the ISB6.7 CM2150 coverage group shown for 2007-09 service information. The accelerator pedal position sensor is located on the accelerator pedal, and the document directs users to the OEM troubleshooting and repair manual for vehicle-specific component location and repair instructions. For official manufacturer information, visit Cummins.
Who needs this Cummins ISB6.7 1239 manual
Workshop owners, diesel mechanics, and fleet technicians need this ISB fault code manual when diagnosing SPN 2623 FMI 3/3, an accelerator pedal or lever position sensor 2 circuit voltage above normal fault. The guide is useful when an amber CHECK ENGINE lamp is active and the engine is limited to severe derate or limp home power.
The procedure covers sensor supply faults, connector pin inspection, 4.75 to 5.25 VDC supply and return circuit testing, circuit response checks, OEM harness open-circuit tests, pin-to-pin short tests above 100k ohms, ECM connector inspection, and inactive fault clearing. It also notes possible causes such as a signal circuit shorted to battery or 5 volt supply, an open accelerator pedal return circuit, accelerator supply shorted to battery, or a failed accelerator pedal position sensor. Full PDF available in the DiagTechPro manuals library, free account required to download.
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