This fault code 3343 DTCs document is a troubleshooting PDF for Engine Charge-Air Cooler Efficiency on CM2250 engines. It explains the intake manifold temperature sensor circuit, the fault setting logic, lamp behavior, clearing conditions, and guided diagnostic steps using INSITE™ electronic service tool.
Official fault code 3343 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250 (2010-12); extract also lists ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSB6.7 CM2250, QSL9 CM2250, and GX CM2250 in associated procedure coverage. |
| System/Group | DTCs; Intake Manifold Pressure/Temperature Sensor Circuit; Engine Charge-Air Cooler Efficiency |
| Publication no. | Not shown in the extract |
| Year/Revision | Year unknown; last modified 11-Jun-2010 and 08-Dec-2010 |
| Pages | 7 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 3343
- 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 – Verify Intake Manifold Temperature Sensor Condition.
- Guided Step 1A – Check for active fault codes.
- Guided Step 1B – Monitor the intake manfiold air temperature reading.
- Guided Step 2 – Check ECM calibration and clear fault codes.
- Guided Step 2A – Check if an ECM calibration update is available.
- Guided Step 2B – Disable the fault code.
Applicable truck models
The file applies to Cummins CM2250 engine diagnostics where Fault Code 3343 is used for Engine Charge-Air Cooler Efficiency – Data Valid But Below Normal Operating Range – Moderately Severe Level. The extract identifies ISB6.7 CM2250 (2010-12) as the library group and also references ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSB6.7 CM2250, QSL9 CM2250, and GX CM2250 in the associated procedures table. It covers an intake manifold 1 temperature sensor located in the air intake manifold, with ECM 5 volt signal monitoring, thermistor resistance behavior, and a diagnostic condition where intake manifold temperature is greater than 111°C [232°F] for 5 seconds. For manufacturer information, visit Cummins official website.
Who needs this fault code 3343 DTCs manual
Workshop owners, diesel mechanics, and fleet technicians need this fault code 3343 DTCs manual when diagnosing an amber CHECK ENGINE lamp or MIL related to charge-air cooler efficiency. The procedure points technicians toward active Fault Codes 153, 154, or 436, intake manifold temperature comparison against a known value or mechanical gauge, sensor replacement under Procedure 019-159, ECM calibration review under Procedure 019-032, and final fault clearing with INSITE™ electronic service tool.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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