This PACCAR P3445A engine brake diagnostic document is a technical service manual published by PACCAR for technicians working on MX EPA engine platforms. The guide covers fault code P3445, which is triggered when the PCI ECU (unit D420) detects abnormally low current in the engine brake control circuit. It provides mechanics and workshop owners with complete diagnostic procedures, set conditions, and repair verification steps needed to resolve this specific diagnostic trouble code on PACCAR medium and heavy-duty trucks equipped with EPA-compliant MX engines.
The PACCAR P3445A engine brake manual is essential for any workshop performing emissions diagnostics on PACCAR trucks. This document explains when the PACCAR P3445A engine brake is triggered, the exact diagnostic conditions required to run the test, and how to verify a successful repair after component replacement or wiring correction.
Document details and specifications — PACCAR P3445A engine
| Brand | PACCAR |
| Model coverage | MX EPA engine platforms (EPA 2004, EPA 2013) |
| System/Group | DTCs / MX Europe Engines (EPA 2004) |
| Publication number | P3445 / M033178 |
| Year/Revision | 08.20.2016 (issued 17 August 2017) |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Table of contents
- Set conditions
- Diagnostic condition
- Corresponding OBD readiness monitor
- Reset condition
- Repair verification
- Possible cause
- Additional information
Applies to these models
The P3445A engine brake procedures apply to PACCAR trucks and heavy-duty vehicles equipped with MX EPA engines, specifically those using EPA 2004 and EPA 2013 emissions standards. The document covers diagnostics for the PCI ECU (D420) control module and engine brake solenoid circuits. For more information on PACCAR engines and diagnostic resources, visit PACCAR official website.
Who needs this P3445A engine brake manual
Diesel mechanics, fleet technicians, and workshop owners diagnosing engine brake control faults on PACCAR MX EPA trucks require the P3445A engine brake guide. The document provides the troubleshooting logic needed to identify whether faults stem from open wiring circuits or solenoid malfunctions, guiding technicians through the complete repair verification cycle.
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