This document is a Cummins accelerator pedal sensor troubleshooting procedure for Fault Code 1242 on ISB6.7 CM2350 engines. It explains the dual accelerator position sensor circuit, why the red STOP ENGINE lamp can activate, and how to test the OEM harness, connectors, sensor supply circuits, signal wires, and ECM calibration status.
Official Cummins accelerator pedal sensor document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2350 (2013-17) |
| System/Group | DTCs; accelerator pedal or lever position sensor 1 and 2 |
| Publication no. | Fault Code: 1242; PID: P091; SPN: 91; FMI: 2/2 |
| Year/Revision | Unknown; copyright 2017 |
| Pages | 10 |
| File size | 0.4 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 the fault codes.
- Step 2A) Inspect the accelerator pedal position sensor and connector pins.
- Step 2B) Check the circuit response.
- Step 2C) Check the accelerator pedal position 1 sensor supply voltage and return circuit.
- Step 2D) Check the accelerator pedal position 2 sensor supply voltage and return circuit.
- Step 2E) Check the fault codes.
- Step 3A) Inspect the ECM and OEM harness connector pins.
- Step 3B) Check for a pin-to-pin short circuit in the OEM harness.
- Step 3C) Check for a pin-to-pin short circuit in the OEM harness.
- Step 4A) Check if an ECM calibration update is available.
- Step 4B) Disable the fault code.
Applicable truck models
This file applies to Cummins ISB6.7 CM2350 engines listed for 2013-17 service coverage, with the accelerator pedal or lever position sensor mounted to the accelerator pedal assembly. The extract directs technicians to the OEM service manual and OEM wiring diagram for connector pin identification because the harness and pedal installation are vehicle-supplied. See the manufacturer at Cummins official website.
Who needs this Cummins accelerator pedal sensor manual
Workshop technicians need this Cummins accelerator pedal sensor manual when Fault Code 1242 is active and the engine will only idle or has limp-home throttle control. It is useful for checking whether accelerator position sensor 1 and accelerator position sensor 2 differ by more than 2 percent, whether Fault Codes 131, 132, 1239, or 1241 are also active, and whether the OEM harness has a pin-to-pin short circuit.
The procedure covers inspection for loose connectors, corroded pins, moisture, missing seals, broken connector shells, damaged locking tabs, and wire insulation damage. It also gives voltage checks for the 5-volt supply and return circuits, resistance checks above 100k ohms on the signal circuits, guidance for replacing a damaged accelerator pedal, and a final ECM Calibration Revision History comparison before clearing the code.
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