This document is the 2013 PACCAR MX Diagnostic Service Manual covering PACCAR MX fuel filter for EPA 2013 emissions-compliant engines. Published by PACCAR, it provides detailed diagnostic procedures and troubleshooting steps for fault codes P1191 and P1194, which indicate fuel filter blockage conditions detected by the PCI ECU (D420) engine control unit.
The PACCAR MX fuel filter are triggered when fuel temperature exceeds 95°C (203°F) and fuel pressure drops below acceptable thresholds. Mechanics and workshop technicians use this manual to diagnose clogged fuel filters, verify sensor operation, and execute proper repair validation procedures on PACCAR MX-powered trucks.
Document details and specifications — PACCAR MX fuel
| Brand | PACCAR |
| Model coverage | PACCAR MX Engines (EPA 2013) |
| System/Group | DTCs / MX Engines |
| Year/Revision | 2013 |
| Pages | 6 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Table of contents
- P1191 – Fuel filter – Clogged
- Code number and fault code description
- Fault code information and readiness group
- Description of component(s)
- Diagnostic condition
- Set condition of fault code
- Reset condition of fault code
- Possible causes
- Additional information
- Diagnostic Step-by-Step procedure (Steps 1–4)
- Verification Drive Cycle
- P1194 – Fuel filter – Very clogged
- Complete diagnostic breakdown for P1194
Applies to these models
This PACCAR MX fuel filter manual applies to PACCAR MX engines manufactured to meet 2013 EPA emission standards. It covers trucks equipped with the PCI ECU (D420) control module, fuel pressure sensor (F801), and fuel temperature sensor (F803). Diagnostic procedures and component replacement instructions are specific to PACCAR MX powertrains. For official engine support and additional technical resources, visit PACCAR official website.
Who needs this MX fuel filter manual
Professional truck mechanics and workshop owners diagnosing PACCAR MX engine faults need this MX fuel filter guide. It is essential for technicians troubleshooting active or inactive diagnostic trouble codes P1191 and P1194, inspecting fuel system components, and validating repairs using DAVIE diagnostic software and proper drive cycle procedures.
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