This Cummins 343 troubleshooting document is a 15-page diagnostic procedure for Fault Code 343 on CM2150-controlled Cummins engines. It explains the ECM internal hardware warning, the unswitched battery supply circuit, related symptoms, and guided checks using INSITE™ electronic service tool and a multimeter.
Official Cummins 343 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL with CM2150 |
| System/Group | DTCs; Unswitched Battery Supply; Electronic Control Module Warning Internal Hardware Failure |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 15 |
| File size | 0.4 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 – Read the fault codes.
- Guided Step 2 – Check the batteries and the power connector.
- Guided Step 3 – Check the OEM power harness.
- Guided Step 4 – Recalibrate the ECM.
- Guided Step 5B – Clear the inactive fault codes.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 engines in the 2007-09 coverage group and to the fault-code context identified in the extract as ISB, ISC, and ISL with CM2150 – Unswitched Battery Supply. The OEM battery location, power harness routing, fuses, and repair references depend on the truck manufacturer, so the procedure repeatedly directs the technician to the OEM troubleshooting and repair manual for vehicle-specific locations and harness information. For manufacturer information, visit Cummins official website.
Who needs this Cummins 343 troubleshooting manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this manual when Fault Code 343 is active or has more than 3 inactive counts. It supports checks for battery voltage, cranking voltage, ECM connector pins, OEM fuse condition, add-on wiring at the positive battery terminal, battery supply circuit resistance, keyswitch input wiring, ECM recalibration, and inactive fault-code clearing.
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