This document is a code 286 DTCs troubleshooting manual for SAE J1939 multiplexing configuration errors on CM2150 engines. It explains the circuit description, fault conditions, diagnostic steps, harness checks, and fault clearing process used with INSITE™ electronic service tool.
Official code 286 DTCs document details
| Brand | Cummins |
| Model coverage | ISB, ISC and ISL with CM2150; file group lists ISB6.7 CM2150 (2007-09) |
| System/Group | SAE J1939 Multiplexing Configuration; DTCs |
| Publication no. | Not shown in extract |
| 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
- FAULT CODE 286
- 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 for ECM communication with INSITE™ electronic service tool.
- Guided Step 2 – Check the fault codes.
- Guided Step 3 – Check the OEM VECU and engine ECM for proper multiplexing configuration.
- Guided Step 4 – Check the service data link harness.
- Guided Step 5 – Check the OEM harness.
- Guided Step 6 – Clear the fault code.
Applicable truck models
This PDF applies to Cummins ISB, ISC and ISL engines with CM2150 electronic control, with the file category identifying ISB6.7 CM2150 (2007-09). The document covers vehicles using SAE J1939 Data link multiplexing between the Cummins® engine ECM and an OEM VECU or transmission ECU; the J1939 wiring and VECU location vary by OEM, so the OEM troubleshooting and repair manual remains required for vehicle-specific wiring details. For manufacturer information, visit Cummins official website.
Who needs this code 286 DTCs manual
Workshop technicians need this manual when the amber CHECK ENGINE light is active and Fault Code 286 reports an SAE J1939 Multiplexing Configuration Error – Out of Calibration. It is useful for checking whether multiplexed switches, accelerators, or sensors are enabled correctly, whether source addresses match, and whether the service data link or OEM harness has dirty pins, damaged pins, opens, shorts, or resistance outside the stated 50 ohms to 70 ohms range.
The procedure starts by confirming ECM communication with INSITE™ electronic service tool, then checks active fault status and compares OEM VECU multiplexing configuration with the Cummins engine ECM setup under SAE J1939 Multiplexing in Features and Parameters. Later guided steps inspect the service data link connector, measure resistance between SAE J1939 Data link (+) and (-), inspect the ECM and OEM harness connector pins, test for shorts greater than 100k ohms, and clear inactive fault codes after the fault becomes inactive. Shop Talk also directs users to verify ECM calibration, review calibration revision history on QuickServe™ Online, and recalibrate if necessary.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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