PACCAR MX P0471 is the fault-code chapter of the 2013 PACCAR MX Diagnostic Service Manual covering pressure before turbine data that is erratic, intermittent or incorrect at ignition on. It is a two-trip MIL code with three drive cycle recovery and a comprehensive freeze frame type. Exhaust gas pressure is measured through a steel tube ahead of the EGR valve, and the signal drives the VTG turbocharger, EGR flow, the BPV valve and the engine brake.
Document details at a glance
| Brand | PACCAR |
|---|---|
| Model coverage | PACCAR MX engines, EPA 2013 emissions level |
| System group | DTCs, MX Engines EPA2013 |
| Source publication | 2013 PACCAR MX Diagnostic Service Manual, pages 276 to 280 |
| Pages | 5 |
| File size | 0.5 MB |
| Format | |
| Language | English |
What the PACCAR MX P0471 chapter covers
- Diagnostic conditions: ignition switched on with no engine start, ambient temperature above -20°C
- Set condition: the reading differs by more than 0.36 bar (5.2 psi) from the average of other pressure sensors for over 5 seconds
- The note that a lower measured pressure produces a higher calculated exhaust gas temperature before the turbine
- Pin functions with C38 ground, C61 power supply and C83 the pressure before turbine signal
- A 5 V circuit check at the harness connector with the ignition keyed on
- Possible cause given as pressure sensor before turbine deviation
Diagnostic step sequence and verification
Inside PACCAR MX P0471 the procedure runs as follows. Five steps run from a connector inspection to a targeted look at the P3 sensor for moisture or build-up, cleaned before anything electrical is condemned. Electrical checks then confirm supply and signal voltages and cable continuity. If those are good the sensor is replaced and rechecked in DAVIE, and a surviving fault goes to the PACCAR Engine Support Call Center on 1-800-477-0251.
Trucks and engines it applies to
The chapter covers EPA 2013 PACCAR MX engines with VTG turbochargers in Kenworth and Peterbilt trucks, and verification is a 10 second key-on check with the brakes set. Model programmes and dealer support for these engines are listed on the PACCAR corporate site.
Who needs the PACCAR MX P0471 chapter
Technicians chasing turbo, EGR or engine brake complaints need this chapter, because one deviating pressure signal quietly affects all four control functions.
The complete PDF of the PACCAR MX P0471 chapter is filed in the DiagTechPro manuals library, where a free account is required to download it alongside the rest of the MX Engines EPA2013 fault-code set.
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