The PACCAR MX P1573 boost diagnostic manual is a 5-page technical reference published by PACCAR for mechanics and workshop technicians troubleshooting boost temperature faults on 2013 MX engines. This guide covers the complete diagnostic workflow for fault code P1573, which triggers when boost temperature exceeds 127°C (261°F) for more than 120 seconds. The manual provides electrical schematics, component specifications, and step-by-step repair procedures aligned with PACCAR’s DAVIE diagnostic system.
The PACCAR MX P1573 code description identifies “Boost temperature – Data valid but too high” as a critical emissions-related fault. Understanding how boost temperature affects smoke limits, NOx emissions, DEF dosing, and DPF regeneration is essential for proper diagnosis and repair on these EPA 2013-compliant engines.
Document details and specifications — PACCAR MX P1573
| Brand | PACCAR |
| Model coverage | MX Engines (EPA 2013) |
| System/Group | DTCs / MX Engines |
| Publication number | P1573 |
| Year/Revision | 2013 |
| Pages | 5 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Table of contents
- Code number P1573 and fault code description
- Fault code information (MIL trip count and recovery cycles)
- Effect on system (smoke limit, NOx emissions, DEF dosing, DPF regeneration, BPV valve control)
- Location of components
- Diagnostic conditions and set/reset criteria
- Electrical diagrams and wiring harness connectors (D420, F804)
- Technical data and resistance values for boost temperature sensor
- Possible causes (contaminated intercooler, faulty cooling fan, boost temperature deviation)
- Diagnostic step-by-step procedure (Steps 1573a through 1573e)
- Verification drive cycle requirements
Applies to these models
This diagnostic manual applies to PACCAR MX engines manufactured in 2013 with EPA 2013 emissions compliance. The boost temperature sensor (F804) is located in the inlet manifold near cylinder 2 and communicates with the PCI ECU (D420). The fault code P1573 can be verified and cleared only through DAVIE diagnostic software. For additional technical support on the PACCAR MX P1573 code, contact the Engine Support Call Center at 1-800-477-0251. PACCAR official website
Who needs this PACCAR MX P1573 boost manual
Diesel engine technicians, shop foremen, and fleet service managers working on PACCAR MX trucks must reference this PACCAR MX P1573 diagnostic guide when addressing high boost temperature fault codes. The manual is particularly critical for shops performing emissions compliance repairs and those utilizing DAVIE diagnostic equipment.
The full PACCAR MX P1573 boost diagnostic manual is available in the DiagTechPro manuals library. A free account is required to download the PDF.
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