2013 PACCAR MX-13 – P0471 Pressure before turbine – 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)

Location of component(s)

Diagnostic condition

This diagnostic runs:
* when the ignition is switched 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 before turbine sensor reading differs by more than 0.36 bar [5.2 psi] from the average of other pressure sensor readings 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

Possible causes

Pressure sensor before turbine deviation

Additional information

For this diagnostic, the pressure sensor before turbine (F826) reading is compared with an average of other pressure sensor readings on/off the engine.