This document is a Cummins 2185 fault code troubleshooting manual for the sensor supply 4 circuit on CM2250 engines, including ISB6.7 CM2250 coverage. It explains the high-voltage fault condition, accelerator pedal position sensor supply circuit, OEM harness checks, ECM calibration review, and clearing steps using INSITE™ electronic service tool.
Official Cummins 2185 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, GX CM2250, and other associated CM2220, CM2150, and CM876 engine models |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Accelerator Pedal or Lever Position Sensor Supply |
| Publication no. | 4022254 for ISB6.7 CM2250 in the associated procedures table |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 28-Dec-2010 |
| Pages | 8 |
| File size | 0.2 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 ECM and OEM harness.
- Guided Step 3 – Check ECM calibration and clear fault codes.
Applicable truck models
This PDF applies to Cummins electronic engine platforms listed in the fault-code procedure, with the file grouping focused on ISB6.7 CM2250 (2010-12) DTC diagnostics. The extract also names ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, GX CM2250, ISF2.8 CM2220, ISF3.8 CM2220, ISB4.5, ISD4.5, ISD6.7 CM2150, ISL8.9 CM2150, ISM11 CM876, and ISZ13 CM2150 in the associated ECM and ECM Calibration Code procedure table. For current engine and support information, see the Cummins official website.
Who needs this Cummins 2185 fault code manual
Mechanics and workshop owners need this manual when an amber CHECK ENGINE light or MIL is tied to SPN 3512 FMI 3/3 and the engine will only idle. It is useful for checking whether the 5 VDC accelerator pedal position sensor supply is shorted to battery, shorted to keyswitch power, affected by OEM harness wiring, or requires ECM calibration review.
The procedure states that the diagnostic runs continuously with the keyswitch ON and sets when sensor supply 4 voltage is more than 5.25 VDC for more than 1 second. Guided checks include reading active faults with INSITE™ electronic service tool, disconnecting the OEM harness from the ECM connector, measuring resistance between the accelerator pedal position +5 volt SUPPLY pin and ECM battery SUPPLY (+) pins, checking the ECM keyswitch SIGNAL pin, comparing ECM code and revision number against calibration revision history, and then operating the engine under the listed clearing conditions.
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