2013 PACCAR MX-13 – P006B Pressure after BPV – Data erratic, intermittent, or incorrect at ignition ON

Fault code information

2 trip MIL
3 drive cycle recovery
Readiness group – None
Freeze frame type – Comprehensive

Description of component(s)

Description, pressure sensor after BPV (F823)
The exhaust gas pressure after the BPV valve is measured by the sensor (1) via a steel tube (2).
Effect on the system:
* Correction of the NOx sensor before the catalyst signal
A higher measured exhaust gas pressure after the BPV valve results in lower calculated NOx                         emissions by the engine.
* Calculates the exhaust gas temperature before the turbine
Lower measured exhaust gas pressure after the BPV valve results in higher calculated exhaust gas            temperature before the turbine.

Location of component(s)

Diagnostic condition

This diagnostic runs:
* when the ignition is keyed on (NO engine start), and
* ambient temperature is more than -20°C [-4°F]

Set condition of fault code

The PCI ECU (D420) detects that the measured pressure after BPV differs by more than 0.07 bar [1 psi] from the average of other pressure sensors on the engine for more than 5 seconds.

Reset condition of fault code

To validate the repair, key on the ignition (NO engine start) and wait for 10 seconds to allow the system to power up and the diagnostics to run.

Electrical diagram(s)

Technical data

Handle connectors and pins with care and use matching measuring probes.
Component & wiring check, ECU (D420)
Preparation
* Key off the ignition.
* Disconnect connector F823
* Measure on the front side of wiring harness connector F823

Possible causes

Pressure sensor after BPV deviation

Additional information

For this diagnostic, the pressure sensor after BPV (F823) reading is compared with an average of other pressure sensor readings on/off the engine.

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