The EPA CAN troubleshooting U1854B guide is a comprehensive diagnostic document published by PACCAR for technicians servicing MX-series engines with EPA 2004 and EPA 2013 compliance. This manual provides step-by-step troubleshooting procedures for CAN-related diagnostic trouble codes (U-codes) on PACCAR MX EPA engines, covering electrical component diagnostics, network resistance testing, and fault isolation methods.
The EPA CAN troubleshooting U1854B procedures assume proper supply power and ground to the PCI ECU before beginning diagnostics. The guide emphasizes using DAVIE diagnostics software to clear DTCs and perform quick checks, and warns that disconnecting PCI connectors during troubleshooting will generate multiple errors. This PACCAR MX EPA CAN manual is essential for identifying single and multiple failure modes affecting the CAN network.
Document details and specifications — EPA CAN troubleshooting
| Brand | PACCAR |
| Model coverage | MX_EPA13, MX_EPA04 |
| System/Group | DTCs / MX Europe Engines (EPA 2004) |
| Publication number | U1854B |
| Year/Revision | 18 August 2017 |
| Pages | 7 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Table of contents — EPA CAN troubleshooting
- General troubleshooting — CAN
- Step 1: Investigate related DTCs
- Step 1A: Investigate related DTCs — P-code check with DAVIE
- 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 U1854B guide applies to PACCAR MX-series engines with EPA 2004 and EPA 2013 emissions certification (MX_EPA04 and MX_EPA13). The procedures cover CAN network diagnostics for the PCI ECU, EAS-3 ECU, and related aftertreatment components including the VTG turbocharger actuator, NOx sensors, and humidity sensors. Technicians must use DAVIE diagnostic software and reference Rapido technical data for pin locations and current component specifications. For additional information, visit PACCAR official.
Who needs this PACCAR MX EPA CAN manual
Diesel mechanics, workshop technicians, and fleet maintenance managers diagnosing CAN network faults and U-code diagnostic trouble codes on PACCAR MX EPA engines require this EPA CAN troubleshooting U1854B guide. The manual is essential for professionals performing electrical diagnostics on engine control systems, aftertreatment networks, and CAN bus termination resistance verification.
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