This document is the 2013 PACCAR MX fuel temperature P1167 diagnostic service manual, published by PACCAR for technicians servicing EPA 2013 MX-series engines. The manual provides complete troubleshooting procedures, electrical schematics, and component specifications for diagnosing and repairing high fuel temperature faults in the low-pressure fuel supply gallery.
PACCAR MX fuel temperature P1167 is triggered when the PCI ECU (D420) detects fuel temperature exceeding 92°C (198°F) for more than 300 seconds. This diagnostic runs continuously during ignition-on operation and requires a 3 drive cycle recovery period. The fault affects automatic water draining and engine torque limitation functions.
Document details and specifications — PACCAR MX fuel
| Brand | PACCAR |
| Model coverage | MX Engines (EPA 2013) |
| System/Group | DTCs / MX Engines (EPA2013) |
| Publication no. | P1167 |
| Year/Revision | 2013 |
| Pages | 4 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Table of contents
- Fault code description and information
- Component description and location
- Diagnostic conditions and set/reset criteria
- Electrical diagrams (D420 PCI ECU, F803 connector)
- Technical data: fuel temperature sensor (F803) resistance values
- Component and wiring check procedures for ECU (D420)
- Possible causes and additional information
- Diagnostic step-by-step troubleshooting
- Verification drive cycle procedures
Applies to these models
This MX fuel temperature reference applies to 2013 EPA-compliant PACCAR MX engines equipped with the PCI ECU (D420) and fuel temperature sensor (F803) in the low-pressure fuel supply gallery. The diagnostic procedures and component specifications are specific to this engine family and model year. For official PACCAR resources and additional support documentation, visit PACCAR official website.
Who needs this MX fuel temperature manual
Diesel mechanics, powertrain technicians, and workshop owners servicing PACCAR MX trucks need this fuel temperature code P1167 manual to accurately diagnose fuel system faults, perform sensor testing, validate ECU wiring integrity, and execute repair verification cycles using DAVIE diagnostic software.
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