This injector solenoid fault P1222 code P1222 diagnostic service manual provides technicians with complete troubleshooting procedures for cylinder 4 short circuit faults detected between ECU D420 pins A11 and A12. Published by PACCAR for the 2013 MX engine series, this document covers fuel injector solenoid valve diagnosis, electrical testing, and component replacement procedures essential for workshop repair operations.
The fault code sets when high side voltage on the injector falls between 20% to 80% of threshold value, or when current through the sense resistor on driver bank A exceeds 25 amperes. This injector solenoid fault P1222 code requires visual inspection of connectors and electrical continuity testing before component replacement.
Document details and specifications — injector solenoid fault
| Brand | PACCAR |
| Model coverage | MX Engines (EPA2013) |
| System/Group | DTCs / MX Engines |
| Year/Revision | 2013 |
| Pages | 5 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Table of contents
- P1222 Code number and Fault code description
- Fault code information and diagnostic conditions
- Description of components and control operation
- Injector codes and calibration procedures
- Location of components
- Set and reset conditions
- Electrical diagrams and wiring harness connectors
- Technical data and component resistance specifications
- Diagnostic step-by-step troubleshooting procedures
- Verification drive cycle validation
Applies to these models
This diagnostic guide applies to 2013 PACCAR MX engine vehicles equipped with EPA2013 fuel injection systems. The manual specifically addresses injector solenoid valve testing for cylinders 1–6, with detailed connector pinout data for D420 ECU, B460/B461 harness connectors, and B421–B426 individual solenoid assemblies. For official PACCAR technical resources and engine specifications, visit PACCAR official website.
Who needs this injector solenoid fault P1222 code manual
Diesel engine mechanics and workshop owners diagnosing cylinder 4 fuel injection faults on PACCAR MX engines require this solenoid fault P1222 code reference. Technicians performing electrical continuity testing, solenoid resistance measurement, or ECU pin diagnostics depend on the wiring diagrams and technical specifications contained in this guide.
The complete solenoid fault P1222 code P1222 manual is available in the DiagTechPro manuals library. Create a free account to download the full 5-page PDF document and access related PACCAR diagnostic service bulletins.
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