This document is a EPA CAN troubleshooting U1822B guide covering step-by-step diagnostic procedures for CAN-related diagnostic trouble codes on PACCAR MX engines with EPA 2004 and EPA 2013 emissions standards. Published by PACCAR, this technical manual provides mechanics and workshop owners with systematic fault isolation methods for V-CAN, E-CAN, and A-CAN network problems affecting the PCI ECU and related components.
Document details and specifications — EPA CAN troubleshooting
| Brand | PACCAR |
| Model coverage | MX EPA13, MX EPA04 engines |
| System/Group | DTCs / MX Europe Engines (EPA 2004) |
| Publication no. | M032001 |
| Year/Revision | 08.14.2015 (valid 08-18-2017) |
| Pages | 7 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Table of contents
- General troubleshooting – CAN (MX_EPA13, MX_EPA04)
- Step 1: Investigate related DTCs
- Step 1A: Investigate related DTCs with DAVIE diagnostics
- Step 1B: Visual inspection, aftermarket communication or smart devices
- Step 2: CAN-related component and power checks
- Step 2A: Visual inspection, connections, wiring, CAN components and power
- Step 2B: Electrical checks, supply voltage, CAN components
- Step 3: Isolate faulty CAN network or component
- Step 3A: Electrical checks, resistance, V-CAN network
- Step 3B: Electrical checks, resistance, V-CAN termination resistors
- Step 3C: Electrical checks, resistance, E-CAN termination resistors
- Step 3D: Electrical checks, resistance, A-CAN termination resistors
- Step 4: Clear CAN-related DTCs
- Step 4A: Clear DTCs using DAVIE diagnostics
Applies to these models
This EPA CAN troubleshooting U1822B manual applies to PACCAR MX engines certified under EPA 2004 and EPA 2013 emissions standards, covering the PCI ECU, EAS-3 ECU, and all associated CAN network components including V-CAN, E-CAN, and A-CAN circuits. The procedure addresses U-code DTCs related to CAN communication failures, aftertreatment systems, turbocharger actuators, NOx sensors, and humidity sensors. For official PACCAR technical resources and engine documentation, visit PACCAR official website.
Who needs this EPA CAN troubleshooting U1822B manual
Diesel technicians, fleet maintenance managers, and workshop owners servicing PACCAR MX-powered trucks require this CAN troubleshooting U1822B guide to diagnose and resolve CAN network communication faults. The manual is essential for technicians using DAVIE diagnostics software who must isolate electrical failures in PCI ECU, EAS-3 ECU, and termination resistor circuits.
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