This code 339 DTCs document is a troubleshooting manual for the idle shutdown vehicle accessories relay driver circuit. It explains the fault reason, circuit behavior, diagnostic conditions, INSITE™ checks, relay and harness tests, ECM calibration review, and clearing steps for the code.
Official code 339 DTCs document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250 (2010-12) from file data; extract also lists ISX11.9 CM2250, ISX15 CM2250, and associated ISM11 CM876 procedures |
| System/Group | DTCs; Idle Shutdown Vehicle Accessories Relay Driver Circuit |
| Publication no. | Not shown; associated bulletin numbers include 4022196, 4022250, and 2883445 |
| Year/Revision | Unknown; last modified 11-Jun-2010 and 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
- FAULT CODE 339 – Idle Shutdown Vehicle Accessories Relay Driver – Voltage Below Normal or Shorted to Low Source
- 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 and electronic settings
- Guided Step 2 – Check the idle shutdown relay and circuit
- Guided Step 3 – Check the ECM and OEM harness
- Guided Step 4 – Check ECM calibration and clear fault codes
Applicable truck models
The file information identifies Cummins ISB6.7 CM2250 (2010-12) DTC coverage. The extracted procedure text references ISX11.9 CM2250 and ISX15 CM2250 for the idle shutdown vehicle accessories relay driver circuit, and the associated procedures table also lists ISM11 CM876 with Bulletin Number 4022196, ISX15 CM2250 with Bulletin Number 4022250, and ISX11.9 CM2250 with Bulletin Number 2883445. OEM vehicle coverage depends on the idle shutdown relay location, grounding configuration, and OEM harness wiring shown in the vehicle service manual. See the official Cummins website.
Who needs this code 339 DTCs manual
This manual is for diesel technicians, fleet maintenance staff, and workshop owners diagnosing an amber CHECK ENGINE lamp with low voltage or a short to low source on the idle shutdown relay driver circuit. It is useful when checking INSITE™ settings, connector condition, relay resistance, diagnostic supply voltage, OEM harness shorts, and ECM calibration status.
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