DTC P0234 Turbocharger Overboost Condition (4JJ3 with DPD)

1. DTC P0234 description

The boost pressure sensor is installed to the air duct. The boost pressure sensor changes the signal voltage in accordance with changes in air pressure in the air intake pipe. The ECM monitors the boost pressure sensor signal. If the ECM detects an excessively high signal voltage, the DTC is set. This indicates that the boost pressure is excessively high.

2. Condition for setting DTC P0234

Condition for running the DTC

The battery voltage is 9 to 16 V.
The ignition switch is ON.
The engine is running.
DTCs P003A, P0045, P0048, P0241, P0242, P060B, P0651, P06D2, U0074, and U0110 are not set.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P003A Turbocharger Boost Control Solenoid Performance".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0045 Turbocharger Boost Control Solenoid Circuit".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0048 Turbocharger Control Circuit High".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0241 Turbocharger Boost Sensor Circuit Low".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0242 Turbocharger Boost Sensor Circuit High".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P060B Internal Control Module A/D Processing Performance".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0651 Sensor Reference Voltage 2 Circuit".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P06D2 Sensor Reference Voltage 5 Circuit".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC U0074 Control Module Communication Bus Off - Local CAN".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC U0110 Lost Communication with VNT System".

Condition for setting the DTC

The ECM detects that the actual boost pressure is more than the desired boost pressure by the predetermined value or more for 10 seconds or more under a particular condition.

3. Action taken when DTC P0234 sets

The ECM illuminates the MIL. Refer to Action taken when DTC sets - Type A.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC type definitions".

The ECM limits the fuel injection quantity.
The ECM inhibits the EGR control.
The ECM inhibits the turbocharger control.
The ECM inhibits the cruise control.

4. Condition for clearing DTC P0234

Refer to Conditions for clearing the MIL/DTC - Type A or Type B.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC type definitions".