This is the official 2013 PACCAR MX Diagnostic Service Manual covering CAN communication codes U1144 and fault detection procedures. Published by PACCAR as part of their EPA 2013 emissions diagnostic documentation, this guide provides technicians with complete troubleshooting protocols for communication faults in CAN-networked engine control systems.
Fault code U1144 specifically addresses CAN communication failures related to tachograph message transmission rates. This CAN communication codes U1144 document contains electrical diagrams, diagnostic conditions, and step-by-step repair procedures essential for workshop-level diagnostics on medium-duty and heavy-duty trucks equipped with PACCAR MX engines.
Document details and specifications — CAN communication codes
| Brand | PACCAR |
| Model coverage | MX Engines (EPA 2013) |
| System/Group | DTCs / MX Engines (EPA2013) |
| Year/Revision | 2013 |
| Pages | 4 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Table of contents
- Code U1144 – CAN communication Message (TD) rate too low from tachograph
- Fault code information and readiness group classification
- Component description and diagnostic conditions
- Electrical diagrams and technical data
- Possible causes: CAN network breakdown, wiring interruption, short circuits
- Step-by-step diagnostic procedure (Steps 1144a through 1144d)
- Visual inspection protocol
- Data check verification
- Component repair and replacement guidance
- Engine Support Call Center contact information
- Drive cycle verification procedure
Applies to these models
This CAN communication codes U1144 manual applies to PACCAR MX diesel engines compliant with EPA 2013 emissions standards. The diagnostic procedures cover CAN bus network faults, tachograph communication failures, and related electrical system issues on trucks equipped with PACCAR engine management systems. For complete PACCAR product information, visit PACCAR official website.
Who needs this communication codes U1144 manual
Diesel mechanics, engine diagnostic technicians, and workshop owners servicing heavy-duty trucks with PACCAR MX engines need this reference. The guide is essential for anyone performing CAN network troubleshooting, emission system diagnostics, or electrical fault resolution on EPA 2013 compliant PACCAR powerplants.
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