This document is the MX injector solenoid P1226 diagnostic service manual for 2013 EPA engines. Published by PACCAR as part of their MX Diagnostic Service Manual series, it provides comprehensive fault code information, electrical diagrams, component testing procedures, and step-by-step troubleshooting guidance for mechanics and workshop technicians working on fuel injection systems.
The MX injector solenoid P1226 code indicates high voltage or a short circuit to the ECU supply on pins A2, A10, or A6 of the D420 controller. This manual equips technicians with the diagnostic procedures necessary to identify whether the fault originates from wiring, connectors, fuel injectors, or the PCI ECU itself.
Document details and specifications — MX injector solenoid
| Brand | PACCAR |
| Model coverage | MX Engines (EPA2013) |
| System/Group | Diagnostic Trouble Codes (DTCs) |
| Publication number | Not specified |
| Year/Revision | 2013 |
| Pages | 7 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Table of contents
- Code number P1226 and fault description
- Fault code information and readiness group classification
- Component description and control operation
- Injector calibration codes and programming requirements
- Location of components
- Diagnostic conditions and set/reset criteria
- Electrical diagrams: D420 PCI ECU and B460/B461 connectors
- Wiring harness pinout tables for cylinders 1–6
- Technical data: component resistance specifications at 20°C and 120°C
- Possible causes: faulty wiring, connectors, and injectors
- Diagnostic step-by-step procedure (Steps 1–8)
- Verification and drive cycle validation procedure
Applies to these models
This MX injector solenoid P1226 manual applies to 2013 PACCAR MX engine platforms equipped with EPA 2013 emissions control systems. It covers fuel injector solenoid valve diagnostics for cylinders 1, 2, and 3 (connectors B460, B461, B421–B426), the D420 PCI ECU, and related wiring harness assemblies. For official PACCAR documentation and support resources, visit PACCAR official website.
Who needs this injector solenoid P1226 diagnostic guide
Heavy-duty diesel mechanics, fleet service technicians, and workshop owners diagnosing fuel injection faults on 2013 PACCAR MX engines need this injector solenoid P1226 manual. It is essential for anyone using DAVIE diagnostic software to troubleshoot active or inactive P1226 fault codes and validate fuel injector repairs.
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