This PACCAR DPF sensor data page reproduces the P3758 entry from the 2013 PACCAR MX Diagnostic Service Manual, published by PACCAR for MX engines built to EPA2013 emissions standards. The DTC is a 2 trip MIL fault that sets when the EAS-3 ECU (D374) detects that the difference between the exhaust gas temperature sensor before DPF (F839) and the sensor after DPF (F840) does not match the expected value for present engine operating conditions, rather than a simple out-of-range reading.
PACCAR DPF sensor data — Document details
| Brand | PACCAR |
| Model coverage | PACCAR MX engines, EPA2013 |
| System/Group | DTCs / MX Engines (EPA2013) |
| Publication | 2013 PACCAR MX Diagnostic Service Manual |
| Year/Revision | 2013 |
| Pages | 11 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Table of contents
- Entry conditions: mass flow, EAS-3 sensor, and DPF pressure sensor status
- Step 1: Diesel Exhaust Fluid checks, DEF tank contamination
- Step 2: Investigate related trouble codes
- Step 3: DOC/DPF temperature sensors ECU module (D418) checks
- Step 4: Repair verification cycles
Applies to these models
This DPF sensor data procedure applies to PACCAR MX engines where the DOC/DPF temperature sensors ECU (D418) communicates over A-CAN and the diagnostic only runs once exhaust gas flow is high enough, with no active faults on mass-flow or DPF pressure sensors. Repair verification uses DAVIE Diagnostics after a steady-state cycle. For OEM aftertreatment parts, see the PACCAR official site.
Who needs this DPF sensor data manual
Technicians seeing an intermittent or inconsistent after-DPF reading need this DPF sensor data reference, since the possible cause is a temperature that stops tracking engine load rather than a hard sensor failure, and the fix escalates to the PACCAR Engine Support Center if all steps fail.
The full DPF sensor data PDF, including the DEF contamination check and the D418 resistance table, is available in the DiagTechPro manuals library; a free account is required to download.
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