This is the 2013 PACCAR MX Diagnostic Service Manual covering fault code P1180, a MX fuel temperature code that alerts when fuel temperature is too high in the low-pressure supply gallery. Published by PACCAR for heavy-duty truck technicians, this 4-page technical document provides wiring schematics, electrical specifications, and diagnostic procedures for the PCI ECU (D420) and fuel temperature sensor (F803).
Mechanics and workshop owners use this guide to identify why the fault code sets, understand the impact on engine torque control, and systematically test components before replacement.
Document details and specifications — MX fuel temperature
| Brand | PACCAR |
| Model coverage | PACCAR MX engine trucks |
| System/Group | DTCs / MX Engines (EPA2013) |
| Publication number | P1180 |
| Year/Revision | 2013 |
| Pages | 4 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Table of contents
- Fault code description: Fuel temperature — Data valid but too high, moderately severe
- Description of component(s) and system effects
- Set condition of fault code with pressure and temperature thresholds
- Reset condition and validation procedure
- Electrical diagram: wiring harness connectors D420.A and F803
- Technical data: fuel temperature sensor (F803) resistance values (0–100°C)
- Component and wiring check procedures for ECU (D420)
- Possible causes and additional information
- Diagnostic step-by-step troubleshooting (Step 1: fuel level verification)
- Verification drive cycle validation procedure
Applies to these models
This MX fuel temperature code P1180 diagnostic manual applies to PACCAR MX-series diesel engines in 2013 model year and EPA 2013-compliant heavy-duty trucks equipped with PCI ECU control and low-pressure common rail fuel systems. Refer to PACCAR official website for complete engine and vehicle applications.
Who needs this MX fuel temperature code manual
Diesel mechanics and workshop service managers diagnosing high fuel temperature faults, torque reduction complaints, and water drain inhibition on PACCAR MX-powered trucks require this manual. The fuel temperature code reference is essential for understanding sensor operation, ECU signal integrity, and proper component testing without harness damage.
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