This is the PACCAR MX P1115 coolant diagnostic service manual, a comprehensive technical reference for mechanics diagnosing coolant temperature faults on 2013 PACCAR MX engines complying with EPA emissions standards. Published by PACCAR, this guide covers fault detection, electrical schematics, component testing procedures, and step-by-step repair validation.
The document provides complete diagnostic coverage for DTC P1115, which triggers when the engine control unit detects coolant temperature exceeding 110°C (230°F) for more than 10 seconds, affecting fuel injection timing, engine torque limiting, and driver warning systems.
Document details and specifications — PACCAR MX P1115
| Brand | PACCAR |
| Model coverage | MX Series Engines (EPA 2013) |
| System/Group | DTCs / MX Engines (EPA2013) |
| Publication number | P1115 |
| Year/Revision | 2013 |
| Pages | 4 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Table of contents
- Fault code description and information (P1115)
- Component description and location (coolant temperature sensor F566)
- Diagnostic conditions and set/reset criteria
- Electrical diagrams and wiring harness connectors (D420.A, F566)
- Technical data: component and circuit resistance values
- Possible causes and additional component information
- Diagnostic step-by-step procedure (Steps 1–7)
- Verification drive cycle for repair validation
Applies to these models
This PACCAR MX P1115 coolant manual applies exclusively to 2013 PACCAR MX diesel engines equipped with the PCI ECU (D420) and factory coolant temperature sensor (F566) mounted in the coolant return gallery at the right rear cylinder block. Covers EPA 2013 emissions-compliant variants. For additional technical support, visit PACCAR official website.
Who needs this MX P1115 coolant manual
This MX P1115 coolant diagnostic reference is essential for certified diesel technicians, workshop owners, and fleet maintenance departments troubleshooting coolant overheat faults, sensor malfunction, or engine management system errors on PACCAR MX-equipped trucks. Mechanics require this guide to accurately interpret fault codes, perform electrical continuity testing, validate thermostat operation, and execute proper repair verification cycles.
The complete MX P1115 coolant PDF is available in the DiagTechPro manuals library. Free account registration is required to download this technical resource.
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