ECD SYSTEM, Diagnostic DTC:P0471, P0472, P0473

DTC Code DTC Name
P0471 Exhaust Pressure Sensor "A" Circuit Range / Performance
P0472 Exhaust Pressure Sensor "A" Circuit Low
P0473 Exhaust Pressure Sensor "A" Circuit High

DESCRIPTION

The exhaust gas pressure sensor is fixed to the engine by a holder to protect it from high temperatures.

The exhaust gas pressure sensor is connected to the exhaust manifold via a hose and pipe, and detects the exhaust gas pressure before exhaust turbocharger.

The exhaust gas pressure sensor is supplied with 5 V from the ECM and has a measurement range between 100 kPa (1.01 bar) to 500 kPa (5.1 bar). This is equivalent to 1.0 to 4.5 V.

A01LV89E02
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0471 Exhaust Pressure Sensor "A" Circuit Range / Performance

Either condition is met (3 trip detection logic):


  • The difference between the standard pressure value calculated from the turbo pressure and ambient pressure and the value from the exhaust gas pressure sensor exceeds 200 mbar (20 kPa).

  • The difference between the standard pressure value calculated from the turbo pressure and ambient pressure and the value from the exhaust gas pressure sensor exceeds -200 mbar (-20 kPa).

Tech Tips

The difference of the standard pressure value (turbo pressure and ambient pressure) is 60 mbar (6 kPa) or less.

  • Open or short in exhaust gas pressure sensor circuit

  • Exhaust gas pressure sensor

  • ECM

 Comes on DTC stored
P0472 Exhaust Pressure Sensor "A" Circuit Low

Exhaust gas pressure sensor output voltage is 0.2 V or less.

(3 trip detection logic)

  • Open or short in exhaust gas pressure sensor circuit

  • Exhaust gas pressure sensor

  • ECM

 Comes on DTC stored
P0473 Exhaust Pressure Sensor "A" Circuit High

Exhaust gas pressure sensor output voltage is 4.9 V or more.

(3 trip detection logic)

  • Open or short in exhaust gas pressure sensor circuit

  • Exhaust gas pressure sensor

  • ECM

 Comes on DTC stored
Related Data List
DTC No. Data List

P0471

P0472

P0473

Sensed Value of the Pressure at TrbnUs

Absolute Turbine Upstream Pressure

WIRING DIAGRAM

A002ZYOE71
*a VCPE
*b PEXM
*c EPEM
*d Exhaust Gas Pressure Sensor

CAUTION / NOTICE / HINT

Note

When replacing the ECM, the ECM needs registration and initialization.

Click here

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (EXHAUST GAS PRESSURE SENSOR - ECM)


    1. Disconnect the exhaust gas pressure sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      B237-1 (VC) - B220-24 (VCPE) Always Below 1 Ω
      B237-2 (PEXM) - B220-103 (PEXM) Always Below 1 Ω
      B237-3 (E2) - B220-135 (EPEM) Always Below 1 Ω
      B237-1 (VC) or B220-24 (VCPE) - Body ground Always 10 kΩ or higher
      B237-2 (PEXM) or B220-103 (PEXM) - Body ground Always 10 kΩ or higher
      B237-3 (E2) or B220-135 (EPEM) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (VC VOLTAGE)


    1. A01M1WYC19
      *a

      Front view of wire harness connector

      (to Exhaust Gas Pressure Sensor)

      Disconnect the exhaust gas pressure sensor connector.

    2. Turn the ignition switch to ON.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B237-1 (VC) - B237-3 (E2) Ignition switch ON 4.5 to 5.5 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ECM Click here

    OK

  3. REPLACE EXHAUST GAS PRESSURE SENSOR


    1. Replace the exhaust gas pressure sensor.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0471, P0472 OR P0473)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

    7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.


      Powertrain > Engine and ECT > Trouble Codes

    8. Read the DTCs.

      Result
      Result Proceed to
      No DTC output A
      DTC P0471, P0472 or P0473 B

    A

    END

    B

  5. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 7 Click here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

  7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

    7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.


      Powertrain > Engine and ECT > Trouble Codes

    8. Confirm that the DTC is not output again.

      Result
      Proceed to
      NEXT

    NEXT

    END