Here is a fault script: Code 4530: Charge pressure control error / TCU pos / Air-filling control / Air charge control, anomaly / Air-filling control, deviation / Air-filled deviation Our cars have three control valves for the exhaust/charge stages. Two on the exhaust side and one on the air side. Just some background to start. I know it is readily available, but thought I'll throw some tidbits here anyway. -One is a turbine control valve that gradually switches, via a pressure converter, from high pressure (small turbine) to low pressure (large turbine). Here is an official text: 'The turbine control valve opens a bypass channel on the exhaust side to the low pressure stage (past the high pressure stage). It is operated pneumatically by a vacuum unit and can be variably adjusted. An Electro-pneumatic pressure converter (EPDW) applies vacuum to the vacuum unit. In development, the turbine control valve is referred to as the main control valve.' -Another controls the wastegate also through a pressure converter. Here is an official text: 'On reaching the nominal engine output, the wastegate opens to avoid high boost and turbine pressures. A part of the exhaust gas flows via the tailgate past the turbine of the low pressure stage. It is operated pneumatically by a vacuum unit. The wastegate can be variable adjusted.' -And last is a compressor bypass valve that is controlled by an electronic changeover valve (either on or off). Sep 10, 2011 Function check of the exhaust recirculation control valve and the charge-air pressure actuator. Activation of the charge-air pressure. Jan 17, 2012. 4191 - Charge Air Pressure Activator, Activation 3F57 - Charge Air. So, I'm inclined to think that while the mechanics of the turbo were changed, that the actuator and related electronics weren't and may be problematic. Thinking of a screw adjustment on the actuator arm. Right now, I can see. I drive a bmw 335d. Said fault code is 41A2.charging.actuator. And its best to have the boost pressure measured to check that the turbo is healthy Also. Here is an official text: 'The compressor bypass valve controls the bypass of the high pres- sure stage on the air intake side. It is operated pneumatically by a vacuum unit. The compressor bypass valve is either fully opened or completely closed. An electric changeover valve (EUV) applies vacuum to the vacuum unit.' Here is a diagram: The pressure converters that control the turbine control and wastage control valves are infinitely adjustable. Look like this: The electric changeover valve that control the compressor bypass valve on the air side is either on or off: And here is a vacuum routing diagram. The diesel tech has one, but it's a bit outdated and more convoluted, so realoem it is: #1 are pressure converters. The one further back is a turbine control valve and the one forward is a wastegate control one. #4 is a compressor bypass control valve.
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