DTC P2455 Differential Pressure Sensor Circuit High (4JJ3 with DPD)

1. DTC P2455 description

The exhaust differential pressure sensor is installed to the cylinder head cover bracket near the DPD. The exhaust differential pressure sensor changes the signal voltage in accordance with changes in the exhaust gas pressure difference between the front and rear of the DPD filter. The sensor has the following circuits.

  • 5 V reference circuit
  • Low reference circuit
  • Exhaust differential pressure sensor signal circuit

The exhaust differential pressure sensor sends signals related to the exhaust differential pressure changes to the ECM via the signal circuit. The ECM detects a low signal voltage when there is low differential pressure, such as when there is little PM accumulation. The ECM detects a high signal voltage when there is high differential pressure, such as when there is a lot of PM accumulation. Also, the ECM uses this voltage signal for the DPD regeneration control. If the ECM detects an excessively high signal voltage, the DTC is set.

2. Condition for setting DTC P2455

Condition for running the DTC

  • The battery voltage is 9 to 16 V.
  • The ignition switch is ON.
  • DTCs P060B and P06A3 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 P06A3 Sensor Reference Voltage 4 Circuit".

Condition for setting the DTC

  • The ECM detects that the exhaust differential pressure sensor signal voltage is 4.9 V or more.

3. Action taken when DTC P2455 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 inhibits the DPD regeneration.
  • The ECM assumes a default EGR gas pressure sensor value.

4. Condition for clearing DTC P2455

  • 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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