DTC P0473 EGR Gas Pressure Sensor Circuit High (4JJ3 with DPD)

1. DTC P0473 description

The EGR gas pressure sensor is installed to the exhaust manifold via the adapter. It detects the pressure of the exhaust gas sent from the EGR cooler inlet through the EGR gas pipe and converts the pressure into a voltage signal to send it to the ECM. The sensor has the following circuits.

  • 5 V reference circuit
  • Ground circuit
  • EGR gas pressure sensor signal circuit

The ECM monitors the EGR gas pressure sensor signal voltage. The signal voltage increases as the pressure at the EGR valve inlet rises, and it decreases as the pressure declines. If the ECM detects an excessively high signal voltage, the DTC is set.

2. Condition for setting DTC P0473

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".

Also, the following are met for 5 seconds or more:

  • The engine speed is 1000 rpm or less.
  • The fuel injection quantity is 30 mm3/st or less.

Condition for setting the DTC

  • The ECM detects that the EGR gas pressure sensor signal voltage is 4.65 V or more for 3 seconds.

3. Action taken when DTC P0473 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 EGR control.
  • The ECM assumes a default EGR gas pressure sensor value.

4. Condition for clearing DTC P0473

  • 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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