The 2013 MX exhaust temperature P3789 P3789 diagnostic service manual provides technicians with comprehensive troubleshooting procedures for exhaust gas temperature faults after the DPF filter. Published by PACCAR for MX engine platforms compliant with EPA 2013 emissions standards, this manual covers sensor diagnostics, wiring checks, and component replacement steps.
Fault code P3789 is classified as a “data valid but too high” severity condition affecting the exhaust temperature monitoring system. This MX exhaust temperature P3789 document guides mechanics through sensor voltage measurement, fuel dosing module leak testing, and DOC particulate inspection to identify root causes of excessive post-DPF temperatures.
Document details and specifications — MX exhaust temperature
| Brand | PACCAR |
| Model coverage | MX Engines |
| System/Group | DTCs / MX Engines (EPA2013) |
| Publication no. | P3789 |
| Year/Revision | 2013 |
| Pages | 6 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Table of contents
- Code number and fault description (P3789)
- Fault code information and recovery cycles
- Description of components: temperature sensors F838, F839, F840 and ECU D418
- Diagnostic conditions and set/reset criteria
- Electrical diagrams and wiring harness connector pinouts
- Technical data: component and wiring checks
- Possible causes: fuel injectors, engine oil leakage, fuel pressure sensor, injector solenoids
- Nine-step diagnostic procedure with visual inspection, sensor monitoring, and fuel dosing module testing
- DOC cleaning and crack inspection procedures
- Fault code verification and stationary regeneration test
Applies to these models
This MX exhaust temperature P3789 manual applies to 2013 PACCAR MX diesel engines equipped with DOC (Diesel Oxidation Catalyst) and DPF (Diesel Particulate Filter) aftertreatment systems meeting EPA 2013 emissions regulations. Diagnostic procedures reference EAS-3 ECU (D374) and DOC-DPF temperature sensors ECU (D418) components. For official PACCAR technical resources and engine support, visit PACCAR official.
Who needs this exhaust temperature P3789 manual
Diesel technicians, fleet maintenance managers, and workshop owners diagnosing exhaust temperature faults on PACCAR MX engines require this exhaust temperature P3789 guide. The manual is essential for mechanics performing DPF regeneration, sensor replacement, and DOC component inspection using DAVIE diagnostic software.
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