Fabia CBZA P334B

A friend of mine replaced the turbocharger in his Fabia because he had a fault code indicating a problem with the boost pressure control valve (P334B 00 [167]) – specifically, a mechanical error.

It might not have even been necessary, as the issue could potentially be resolved with a spacer and an update.

Anyway, he tried to adjust the boost pressure regulator. Unfortunately, it didn't work.
I tried it again myself: I deleted the learned values and performed the initial adaptation of the boost pressure sensor, but without success. As soon as you trigger a misfire event, the error code reappears in the memory.

Here are some measurements.
Engine off.

IDE00396-ENG100630 Charging pressure sensor: Feedback - VP_BPA[0] 3.0566 V
IDE03930-ENG102033 Charging pressure sensor: Operating status - STATE_BPA[0] OPM.
IDE03931-ENG102825 Charging pressure regulator: Actual position - POSN_BPA[0] 26.923%
IDE03932-ENG103291 Charging pressure control valve: Target position - POSN_SP_BPA[0] 92.80 %.
IDE03933-ENG102500 Charging pressure control: Target value PWM_BPA[0] -7.999 %.
IDE03934-ENG102232 Charging pressure regulator: Adaptation for the lower limit - VP_BPA_AD_BOL[0] 3.9000 V
IDE03935-ENG100094 Charging pressure sensor: Adaptation for the upper limit - VP_BPA_AD_TOL[0] 0.8000 V
IDE04929-ENG103909 Initial adaptation of boost pressure control valve: Deviation from reference value 1-POSN_RAW_DELTA_1_EOL_BPA -0.00 %.
IDE04930-ENG102435 Initial adaptation of boost pressure control valve: Deviation from reference value 2-POSN_RAW_DELTA_2_EOL_BPA -0.00 %.
IDE04931-ENG99923 Initial adaptation of boost pressure control unit: Adaptation value - FAC_EOL_FOC_ADJ_BPA 0.00 %.



Idle.

IDE00021 Motor speed: 747 rpm.
IDE00025 Coolant temperature: 67°C
IDE00396-ENG100630 Charging pressure sensor: Feedback - VP_BPA[0] 2.9346 V
IDE03931-ENG102825 Charging pressure regulator: Actual position - POSN_BPA[0] 30.951%
IDE03932-ENG103291 Charging pressure control valve: Target position - POSN_SP_BPA[0] 92.80 %.
IDE03933-ENG102500 Charging pressure control: Target value PWM_BPA[0] -7.999 %.
IDE03934-ENG102232 Charging pressure regulator: Adaptation for the lower limit - VP_BPA_AD_BOL[0] 3.9000 V
IDE03935-ENG100094 Charging pressure sensor: Adaptation for the upper limit - VP_BPA_AD_TOL[0] 0.8000 V
IDE04929-ENG103909 Initial adaptation of boost pressure control valve: Deviation from reference value 1-POSN_RAW_DELTA_1_EOL_BPA -0.00 %.
IDE04930-ENG102435 Initial adaptation of boost pressure control valve: Deviation from reference value 2-POSN_RAW_DELTA_2_EOL_BPA -0.00 %.
IDE04931-ENG99923 Initial adaptation of boost pressure control unit: Adaptation value - FAC_EOL_FOC_ADJ_BPA 0.00 %.



At 2400 RPM.

IDE00021 Motor speed: 2387 rpm.
IDE00025 Coolant temperature: 70°C
IDE00396-ENG100630 Charger pressure sensor: Feedback - VP_BPA[0] 0.9961 V
IDE03931-ENG102825 Charging pressure regulator: Actual position - POSN_BPA[0] 92.871%
IDE03932-ENG103291 Charging pressure control valve: Target position - POSN_SP_BPA[0] 92.80 %.
IDE03933-ENG102500 Charging pressure control: Target value - PWM_BPA[0] 8.191 %.
IDE03934-ENG102232 Charging pressure regulator: Adaptation for the lower limit - VP_BPA_AD_BOL[0] 3.9000 V
IDE03935-ENG100094 Charging pressure sensor: Adaptation for the upper limit - VP_BPA_AD_TOL[0] 0.8000 V
IDE04929-ENG103909 Initial adaptation of boost pressure control valve: Deviation from reference value 1-POSN_RAW_DELTA_1_EOL_BPA -0.00 %.
IDE04930-ENG102435 Initial adaptation of boost pressure control valve: Deviation from reference value 2-POSN_RAW_DELTA_2_EOL_BPA -0.00 %.
IDE04931-ENG99923 Initial adaptation of boost pressure control unit: Adaptation value - FAC_EOL_FOC_ADJ_BPA 0.00 %.