The PACCAR MX P1087 fuel diagnostic code manual is the official 2013 Diagnostic Service Manual covering low-pressure fuel system faults on PACCAR MX engines. Published by PACCAR, this 11-page technical resource provides mechanics with step-by-step diagnosis and repair procedures for the P1087 code, which triggers when fuel pressure drops below safe operating thresholds for more than 50 seconds during engine operation. The manual includes wiring diagrams, sensor specifications, and verified repair verification cycles.
Document details and specifications — PACCAR MX P1087
| Brand | PACCAR |
| Model coverage | MX Engines (EPA 2013) |
| System/Group | DTCs / MX Engines (EPA2013) |
| Publication no. | P1087 |
| Year/Revision | 2013 |
| Pages | 11 |
| File size | 0.8 MB |
| Format | |
| Language | English |
Table of contents
- Code number P1087: Fuel pressure—Data valid but too low, moderately severe
- Fault code information: 1 trip MIL, 3 drive cycle recovery
- Description of components: Fuel pressure sensor (F801), Fuel temperature sensor (F803)
- Location of components with diagrams
- Diagnostic conditions and set conditions
- Reset conditions and validation procedures
- Electrical diagrams and wiring harness connector pinouts
- Technical data: Component and wiring checks
- Possible causes and items to check
- Diagnostic step-by-step troubleshooting procedure
- Step 1: Investigate related trouble codes (P2541, P2542)
- Step 2: Fuel system low-pressure checks
- Step 2.A: Visual inspection of connections and wiring
- Step 2.B: DAVIE monitor fuel pressure readings
- Step 2.C: Visual inspection of low-pressure circuit
- Step 3: Repair verification and DAVIE quick check
- PACCAR Engine Support Center contact information
Applies to these models
This PACCAR MX P1087 fuel diagnostic manual applies to PACCAR MX-series engines meeting 2013 EPA emissions standards. The procedures cover diagnosis of the fuel pressure sensor (F801) and fuel temperature sensor (F803) circuits, low-pressure fuel supply system checks, and fuel lift pump performance assessment. The manual references specific job IDs for fuel system maintenance, including strainer replacement (job 66976) and fuel filter element service (job 66433). For more information on PACCAR engines and technical support, visit PACCAR official website.
Who needs this PACCAR MX P1087 fuel manual
Heavy-duty diesel mechanics and workshop owners working on PACCAR MX-powered trucks require this P1087 fuel pressure diagnostic guide to accurately isolate and repair low fuel pressure faults. The manual is essential for technicians performing DAVIE diagnostics and wiring continuity checks on fuel system sensors.
The complete PACCAR MX P1087 fuel manual is available in the DiagTechPro manuals library. A free account is required to download the full 11-page PDF and access related fuel system service bulletins.
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