Boost pressure sensor is used to detect the intake manifold pressure and which is governed by the waste gate valve of variable turbine geometry.(VGT-turbocharger) In order to output a voltage signal to the ECM which is directly proportional to the applied intake pressure, the boost pressure sensor must measure the instaneous pressure in the intake manifold. The boost pressure is calculated from a stepoint value map depending on engine speed and fuel quantity. The boost pressure is subdivided into recognition of driving style, stepoint value calculation, boost pressure governor (closed-loop control), boost pressure open-loop control, controlled adaption of governor parameter and monitoring, and shut-off.
If the boost pressure sensor is reading an extremely low or high intake air pressure during two driving cycles, these codes will be set.
If the ECM is reading an uncharacteristic boost pressure sensor supply voltage as compared to the engine load during driving cycles, this code will be set.
DTC NO.
Detecting Condition
Possible Cause
C 001
C 002
C 003
C 004
? C 001
Output signal < 180 ?
? C 002
Output signal > 4.87 V
? C 003
Sensor supply voltage deviates range from 4.7 to 5.1V
? C 004
Error is recognized if |actual boost pressure - baro metric pressure| is above 140 hPa when the engine speed is below 210 rpm(A/T) or below 50 rpm(M/T)
? Engine Condition : RUN
? Fuel Limit : YES
? Fuel Cut : NO
? EGR OFF : NO
? MIL : NO
? LIMP HOME MODE
? Boost pressure is fixed value of 1800 hPa when the boost pressure sensor is defective
? Boost pressure is fixed value of 900 hPa by ECM when the boost pressure and the barometric pressure sensor are defective at the same time
? Open or short in circuit
? Boost pressure sensor
? AFS
? Turbocharger
? ECM