This document is a Cummins fault 343 troubleshooting manual for ECM warning internal hardware failure diagnostics. It explains how Fault Code 343 is set when internal ECM diagnostics detect a read or write error, and it links the fault to ECM power supply errors, possible hard starting, engine dying, or inaccurate fault, trip, and maintenance monitor data.
Official Cummins fault 343 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250 listed in file data; extract also references ISX11.9 CM2250, ISX15 CM2250, QSB6.7 CM2250, QSL9 CM2250, GX CM2250, ISB4.5, ISD4.5, ISD6.7 CM2150, ISL8.9 CM2150, ISM11 CM876, ISZ13 CM2150, ISF2.8 CM2220, and ISF3.8 CM2220. |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Electronic Control Module (ECM) |
| Publication no. | Not shown as a single publication number; associated bulletin numbers include 4022250, 2883445, 4022256, 4022255, 4022188, 4022190, 4022196, 4022133, 4022178, and 4021704. |
| Year/Revision | Last Modified: 04-Jan-2011; overview page Last Modified: 11-Jun-2010 |
| Pages | 17 |
| 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 2B – Check the battery voltage.
- Guided Step 3 – Check the OEM power harness.
- Guided Step 4 – Recalibrate the ECM.
- Guided Step 5 – Check ECM calibration and clear fault codes.
Applicable truck models
The extract identifies Cummins engine control module procedures across CM2250, CM2150, CM876, and CM2220 applications, including ISX11.9 CM2250, ISX15 CM2250, QSB6.7 CM2250, QSL9 CM2250, GX CM2250, ISB4.5, ISB6.7, ISD4.5, ISD6.7 CM2150, ISL8.9 CM2150, ISM11 CM876, ISZ13 CM2150, ISF2.8 CM2220, and ISF3.8 CM2220. The troubleshooting path applies to ECM battery supply, OEM power harness, keyswitch input, ECM calibration code, and INSITE electronic service tool checks described in the document. Manufacturer information is available from Cummins official website.
Who needs this Cummins fault 343 manual
This Cummins fault 343 manual is useful for diesel technicians, fleet maintenance teams, and workshop owners diagnosing amber CHECK ENGINE or MIL complaints related to ECM power supply errors. It supports inspections of battery connections, cranking voltage, OEM fuses, ECM connector pins, supply circuit resistance, keyswitch wiring, ECM recalibration, and final fault clearing with INSITE.
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