This fault code 1242 DTCs document is a diagnostic troubleshooting manual for accelerator pedal or lever position sensor 1 and 2 data that is erratic, intermittent, or incorrect. It explains the circuit, fault conditions, ECM response, guided checks, harness inspections, calibration review, and fault clearing steps for CM2250 applications.
Official fault code 1242 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; associated CM2250 listings include ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Accelerator Pedal or Lever Position Sensor 1 and 2 Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 in the associated procedures table |
| Year/Revision | Last Modified: 20-Jan-2011; overview section Last Modified: 11-Jun-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 2B – Check the circuit response.
- Guided Step 2D – Check the accelerator pedal position 2 sensor supply voltage and return circuit.
- Guided Step 2E – Check the fault codes.
- Guided Step 3B – Check for a pin-to-pin short circuit in the OEM harness.
- Guided Step 4 – Check ECM calibration and clear fault
Applicable truck models
This file applies to Cummins electronic engines using the accelerator pedal position sensor circuit described in the procedure, with the file group identifying ISB6.7 CM2250 coverage. The extract also lists associated ECM calibration code procedures for ISF2.8 CM2220 E, ISF2.8 CM2220 AN, ISF3.8 CM2220 AN, ISB4.5, ISB6.7, ISD4.5, and ISD6.7 CM2150 SN, ISL8.9 CM2150 SN, ISM11 CM876 SN, ISZ13 CM2150, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. For vehicle-specific accelerator pedal location and wiring details, the procedure directs technicians to the OEM service manual and the circuit diagram or wiring diagram. Manufacturer information is available from Cummins official website.
Who needs this fault code 1242 DTCs manual
Workshop technicians need this file when the ECM detects accelerator position sensor number 1 and number 2 reading different values by more than 2 percent and the engine will only idle. It is also useful for diagnosing related active codes 131, 132, 1239, and 1241 before replacing a pedal, repairing connector pins, checking 4.75-VDC to 5.25-VDC sensor supply voltage, testing for greater than 100k ohms between pins, or reviewing ECM calibration with INSITE™ electronic service tool.
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