The MX EPA 2013 P1026 P1026 diagnostic manual is a comprehensive service document published by PACCAR for technicians diagnosing back pressure valve faults on MX series engines. This 5-page technical guide covers the BPV actuator out-of-calibration condition, complete with wiring diagrams, electrical specifications, and step-by-step troubleshooting procedures.
P1026 is triggered when the BPV actuator detects that the open (100%) position falls outside the factory calibration range. The back pressure valve controls exhaust gas mass flow and creates backpressure in the exhaust system for emission control, engine braking, and EAS (Exhaust Aftertreatment System) heating.
Document details and specifications — MX EPA 2013
| Brand | PACCAR |
| Model coverage | MX series engines |
| System/Group | DTCs / MX Engines (EPA 2013) |
| Publication no. | P1026 |
| Year/Revision | 2013 |
| Pages | 5 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Table of contents
- P1026 fault code description and information
- BPV actuator component description and operation
- Control system overview (E-CAN communication)
- Unpowered and fail-safe position behavior
- System effects and functional role
- Diagnostic condition and set criteria
- Reset conditions
- Electrical diagrams and connector pinouts (D420, L096)
- Technical data: component and wiring checks
- Possible causes and additional information
- Step-by-step diagnostic procedure (Steps 1026a through 1026e)
- Verification drive cycle
Applies to these models
This manual applies to PACCAR MX series diesel engines equipped with EPA 2013 emission controls and BPV actuator assemblies (component L096). The MX EPA 2013 P1026 diagnostic procedures cover trucks using E-CAN communication between the PCI ECU and the intelligent BPV actuator module. For official PACCAR technical resources and engine support, visit PACCAR official website.
Who needs this EPA 2013 P1026 P1026 manual
Diesel mechanics, technicians, and workshop owners diagnosing back pressure valve faults on PACCAR MX engines require this manual. The EPA 2013 P1026 P1026 guide is essential for anyone performing electrical diagnostics, component replacement, or sensor calibration on Cummins-powered PACCAR trucks.
The complete EPA 2013 P1026 P1026 PDF is available in the DiagTechPro manuals library. A free account is required to download this technical document.
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