T6 2018 CXEB Underboost

[Ben...]

Just replaced intake manifold (genuine) due to swirl flaps stuck. After putting it all back together and running it down the road it seemed fine. Set off up hill and went flat out and the glow plug light started flashing and vehicle went into limp mode, recycled the ignition and full power again. Plugged vehicle up and fault code P029900 Turbo/Supercharger underboost, checked all boost pipe connections and vac lines and all seem to be okay. Bit stuck.

 

[mmi]

Can you make a log of

(1) engine off (ignition on)

a) charge pressure sensor in manifold​

b) charge pressure sensor in charge cooler inlet​

c) specified/commanded charge pressure,​

d) turbine actuator position​

e) turbine actuator commanded position​

(2) the same engine idling

Possibly something useful in these

Wastegate actuator adaption CXEB

Meanwhile - it seems that we can run the G581 into different position via engine's Basic Settings > IDE00457 - Test of turbocharger. Test runs for 60 seconds sweeping the actuator a couple of times. However, I'm not sure if OBDeleven can make a log while test is running. At least in the...

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[T6_measured] 01-Engine - Built-in tests for turbocharger

HOW-TO run engine's built-in test for turbocharger Engine running VCDS > Select > Engine > Basic Settings > IDE00457 - Test of turbocharger Select "Measuring Values" Pick up e.g. the following data items for monitoring: IDE00021 Engine RPM IDE07375 Charge pressure before throttle valve...

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