This Cummins 1242 troubleshooting document explains Fault Code 1242 for the accelerator pedal or lever position sensor circuit on CM2150 engines. It covers the code reason, ECM response, sensor voltage checks, OEM harness inspections, and INSITE™ steps used to clear inactive fault codes.
Official Cummins 1242 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL with CM2150 |
| System/Group | DTCs; accelerator pedal sensor |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 14 |
| File size | 0.3 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 readings.
- 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) fault code diagnostics. The extract also identifies ISB, ISC, and ISL with CM2150 accelerator pedal sensor coverage, but the accelerator pedal position sensor location is directed to the original equipment manufacturer troubleshooting and repair manual. See the official manufacturer site at Cummins official website.
Who needs this Cummins 1242 troubleshooting manual
This manual is useful for diesel mechanics, fleet technicians, and workshop owners diagnosing a red STOP ENGINE lamp where accelerator position sensor number 1 and number 2 read different values. It is especially relevant when the engine will only idle and INSITE™ is needed to read, verify, disable, and clear the fault.
The diagnostic procedure states that Fault Code 1242 sets when the ECM detects more than a 2 percent difference between accelerator position sensor 1 and accelerator position sensor 2. It describes a hall-effect accelerator pedal position sensor with 5 volt supply, return, and signal circuits, then checks for related active codes including Fault Codes 131, 132, 1239, and 1241. The guided tests include connector inspection for loose connectors, corroded pins, bent or broken pins, pushed back or expanded pins, moisture, damaged seals, dirt, broken connector shells, wire insulation damage, and damaged locking tabs. Voltage checks call for 4.75 to 5.25-VDC on accelerator pedal position 1 and position 2 supply and return circuits. Harness tests check pin-to-pin short circuits in the OEM harness, with a greater than 100k ohms specification before proceeding. Repair actions point to OEM Wiring Harness Procedure 019-071, connector and pin inspection Procedure 019-361, and resistance measurement Procedure 019-360. The final steps connect all components, use INSITE™ electronic service tool, confirm Fault Code 1242 is inactive, and clear inactive fault codes.
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