This Cummins accelerator pedal fault document is a diagnostic troubleshooting manual for Fault Code 1241 on Cummins ISB6.7 CM2150 applications. It explains the accelerator pedal or lever position sensor 2 circuit, the low-voltage fault condition, and the guided checks used to isolate sensor, connector, harness, or ECM causes.
Official Cummins accelerator pedal fault document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL accelerator or pedal sensor coverage |
| System/Group | DTCs; Accelerator Pedal or Lever Position Sensor 2 Circuit |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 16 |
| File size | 0.4 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 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 file applies to Cummins ISB6.7 CM2150 (2007-09) diagnostic trouble code work, with the extract identifying Fault Code 1241, SPN 2623, FMI 4/4. The text also names ISB, ISC, and ISL accelerator or pedal sensor coverage, but it directs component location and pedal repair information to the OEM troubleshooting and repair manual. For brand reference, visit the Cummins official website.
Who needs this Cummins accelerator pedal fault manual
This manual is for diesel mechanics, fleet technicians, and workshop owners diagnosing low voltage on accelerator pedal position sensor 2. It is useful when an amber CHECK ENGINE light, severe engine derate, limp home power only, or intermittent accelerator response points to Fault Code 1241.
The procedure covers a hall-effect accelerator position sensor with two position sensors, both supplied with 5 volts from the ECM. It states that the ECM sets the code when throttle pedal signal voltage is less than 0.35-VDC for more than 1 second, and it lists possible causes such as a signal shorted to engine ground or return wires, a malfunctioning accelerator pedal position sensor, or an open circuit in the signal, supply, or return wiring.
The guided tests use INSITE™ electronic service tool checks, connector inspections, voltage measurement from the 5 volt SUPPLY pin to the RETURN pin, and resistance tests in the OEM harness. Specifications shown include 4.75 to 5.25 VDC for supply voltage, less than 10 ohms for open-circuit checks, and greater than 100k ohms for pin-to-pin and pin-to-ground short checks. The document also tells technicians to verify ECM calibration on QuickServe® Online, check for Fault Code 1696, inspect ECM and OEM harness connector pins, repair the OEM Wiring Harness where required, and clear inactive fault codes after the repair.
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