DTC P0242 Turbocharger Boost Sensor Circuit High (4JJ3 with DPD)

1. DTC P0242 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 sensor has the following circuits.

  • 5 V reference circuit
  • Low reference circuit
  • Boost pressure sensor signal circuit

The boost pressure sensor transmits signals related to air pressure changes within the air intake pipe to the ECM via the signal circuit. The ECM detects a low signal voltage in low boost pressure, such as when the engine is under low load. The ECM detects a high signal voltage in high boost pressure, such as when the engine is under high load. If the ECM detects an excessively high signal voltage, the DTC is set.

2. Condition for setting DTC P0242

Condition for running the DTC

  • The battery voltage is 9 to 16 V.
  • The ignition switch is ON.
  • DTCs P060B and P06D2 are not set.

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 P06D2 Sensor Reference Voltage 5 Circuit".

Condition for setting the DTC

  • The ECM detects that the boost pressure sensor signal voltage is 4.9 V or more for 3 seconds.

3. Action taken when DTC P0242 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 cruise control.
  • The ECM assumes a default boost pressure sensor value.

4. Condition for clearing DTC P0242

  • 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".

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