This is the 2013 PACCAR MX Diagnostic Service Manual covering PACCAR MX sensor supply P0698 and P0699, published by PACCAR for engine control diagnostics on heavy-duty trucks. The document provides fault code descriptions, diagnostic conditions, set and reset criteria, and possible causes for internal ECU PCI 5V reference sensor power supply failures.
The PACCAR MX sensor supply document addresses two critical sensor voltage faults that trigger the malfunction indicator lamp (MIL) and reduce engine performance until resolved.
Document details and specifications — PACCAR MX sensor
| Brand | PACCAR |
| Model coverage | PACCAR MX Engines |
| System/Group | DTCs / MX Engines (EPA2013) |
| Publication number | Not listed |
| Year/Revision | 2013 |
| Pages | 2 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Table of contents
- P0698 — ECU PCI 5V sensor supply – Voltage too low or short circuit to ground
- P0699 — ECU PCI 5V sensor supply – Voltage too high or short circuit to supply
- Fault code information and recovery procedures
- Diagnostic conditions and set/reset criteria
- Possible causes and additional information
- Verification drive cycle requirements
Applies to these models
This service manual applies to all PACCAR MX engines meeting 2013 EPA emissions standards. The MX sensor supply P0698 and P0699 are internal ECU PCI reference voltage faults that do not require external component diagnostics. For complete technical support, visit PACCAR official website.
Who needs this MX sensor supply manual
Diesel mechanics, truck technicians, and workshop owners diagnosing fault codes on PACCAR MX-equipped heavy trucks need this MX sensor supply reference. Both codes trigger MIL illumination, reduce engine torque, and prevent multiple OBD monitors from running, making proper diagnosis essential for safe truck operation.
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Using this document effectively
Use PACCAR MX sensor supply — Diagnostic Service Manual 2013 EPA as a reference alongside the exact machine identification, engine family, control module, and publication revision shown on the equipment. Confirm that the model and production range match before following any table, connector view, test sequence, or specification. Record the original fault code and operating conditions before clearing codes or disconnecting components.
