ECD SYSTEM, Diagnostic DTC:P0471,P0472 and 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.

A342515E02

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).

Tip:

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
Table 1. Related Data List

DTC No.

Data List

P0471

P0472

P0473

Sensed Value of the Pressure at TrbnUs

Absolute Turbine Upstream Pressure

WIRING DIAGRAM

A165731E75

CAUTION / NOTICE / HINT

Note:

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

Click here

Tip:

  • 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

      B130-1 (VC) - B112-24 (VCPE)

      Always

      Below 1 Ω

      B130-2 (PEXM) - B112-103 (PEXM)

      Always

      Below 1 Ω

      B130-3 (E2) - B112-135 (EPEM)

      Always

      Below 1 Ω

      B130-1 (VC) or B112-24 (VCPE) - Body ground

      Always

      10 kΩ or higher

      B130-2 (PEXM) or B112-103 (PEXM) - Body ground

      Always

      10 kΩ or higher

      B130-3 (E2) or B112-135 (EPEM) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

  2. CHECK HARNESS AND CONNECTOR (VC VOLTAGE)

    1. A351158C23

      *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

      B130-1 (VC) - B130-3 (E2)

      Ignition switch ON

      4.5 to 5.5 V

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE ECMClick 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

    REPLACE ECMClick here

  5. REPLACE ECM

    1. Replace the ECM.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick 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