This PACCAR MX P1040 emissions diagnostic manual is the official 2013 service reference for technicians troubleshooting pressure sensor faults on PACCAR MX engines compliant with EPA 2013 emissions standards. Published by PACCAR, this five-page guide covers the complete diagnostic workflow, electrical schematics, and step-by-step repair procedures for the fault code P1040, which indicates “Pressure after BPV – Data valid but too low.”
Document details and specifications — PACCAR MX P1040
| Brand | PACCAR |
| Model coverage | PACCAR MX Engines |
| System/Group | DTCs / MX Engines (EPA 2013) |
| Publication number | Not specified |
| Year/Revision | 2013 |
| Pages | 5 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Table of contents
- P1040 Fault Code Description and Information
- Description of Component(s) – Exhaust Gas Pressure Sensor and BPV Valve
- Effect on System – NOx Sensor Correction and Temperature Calculation
- Location of Component(s)
- Diagnostic Conditions and Fault Set/Reset Parameters
- Electrical Diagram(s) – Wiring Harness Connectors D420 and F823
- Technical Data – Component and Wiring Check Procedures
- Diagnostic Step-by-Step Troubleshooting Tree (Steps 1–6)
- Verification Drive Cycle Requirements
Applies to these models
This PACCAR MX P1040 emissions reference applies to all PACCAR MX engines manufactured to EPA 2013 emissions standards. The manual addresses the pressure sensor mounted after the bypass valve (BPV) system and includes diagnostic protocols specific to MX-series powertrains. For additional technical support and engine specifications, visit PACCAR official website.
Who needs this MX P1040 emissions manual
Diesel engine mechanics and workshop owners servicing PACCAR MX-powered trucks should reference this MX P1040 emissions manual when diagnosing active fault codes related to low exhaust pressure readings. Technicians performing OBD compliance checks and emissions system repairs will find the electrical schematics, component locations, and six-step troubleshooting procedure essential for rapid root-cause identification and efficient repair execution.
The complete MX P1040 emissions diagnostic manual is available in the DiagTechPro manuals library. A free account is required to download the full PDF.
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