What Causes P023400 Turbocharger Overboost Condition?
1 Answers
If the wastegate or wastegate control valve malfunctions, it may cause the system to overboost. Possible causes include misfire conditions exceeding calibrated thresholds, knock sensor circuit faults, low-speed fuel pump relay failures, transmission fluid temperature exceeding normal range, turbocharger pressure regulator valve failure, etc. More details are as follows: 1. P0234 Turbocharger/Supercharger A Overboost Condition The turbocharger utilizes exhaust gas inertia to drive the turbine, which in turn drives the coaxial impeller to boost intake pressure, thereby increasing engine power. 2. To prevent turbocharger/supercharger overboost, when pressure reaches the preset maximum value, the air pressure activates the wastegate actuator (pneumatic-mechanical type) to divert some exhaust gas away from the turbine, thereby reducing turbine speed and boost pressure.