PACCAR MX P0304 is the fault-code chapter of the 2013 PACCAR MX Diagnostic Service Manual covering a major decrease in combustion in cylinder 4 relative to the other cylinders. The wording matters: this is the major-decrease series, a step above the codes that stop short of complete failure. The page itself is one sheet, and every field under the description directs the reader to the Engine Support Center.
Document details at a glance
| Brand | PACCAR |
|---|---|
| Model coverage | PACCAR MX engines, EPA 2013 emissions level |
| System group | DTCs, MX Engines EPA2013 |
| Source publication | 2013 PACCAR MX Diagnostic Service Manual, page 236 |
| Pages | 1 |
| File size | 0.3 MB |
| Format | |
| Language | English |
What the PACCAR MX P0304 chapter covers
- The exact severity wording that distinguishes a major decrease from a partial one
- Its place in the major-decrease series that runs alongside the milder contribution codes
- Confirmation that no diagnostic or set condition is published
- Confirmation that no electrical diagram or technical data table is printed
- Confirmation that no possible-cause list or step sequence exists
- The single published action: contact the Engine Support Center
Diagnostic step sequence and verification
Inside PACCAR MX P0304 the procedure runs as follows. Nothing is printed to follow, so the evidence has to come from adjacent chapters. Cylinder 4 is wired through connector B461 and solenoid valve B424 in the injector chapters, which give the resistance figures and the diode-check routine for that circuit. The cylinder unbalance chapter adds that the PCI ECU judges an imbalance over more than 500 crankshaft revolutions.
Trucks and engines it applies to
The entry covers EPA 2013 PACCAR MX engines in Kenworth and Peterbilt trucks, and it is read with DAVIE in the same session as the injector and crankshaft codes. Model programmes and dealer support for these engines are listed on the PACCAR corporate site.
Who needs the PACCAR MX P0304 chapter
Technicians triaging a severe misfire want this page early, because the major-decrease wording changes the urgency and points the job toward PACCAR support rather than a parts swap.
The complete PDF of the PACCAR MX P0304 chapter is filed in the DiagTechPro manuals library, where a free account is required to download it alongside the rest of the MX Engines EPA2013 fault-code set.
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