ECD SYSTEM, Diagnostic DTC:P1072, P1131

DTC Code DTC Name
P1072 Plausibility Test with Environment Pressure
P1131 Plausibility Test with Intake Air Pressure

DESCRIPTION

DTC No. DTC Detection Condition Trouble Area
P1072

The fault is set whenever the absolute difference between the pressure upstream of the turbine and the ambient pressure in after-run mode is greater than 120 hPa (12 kPa).

(3 trip detection logic)

Tech Tips

After-run mode is the period between IG OFF and shut down of ECM (EFI MAIN relay off), when the ECM saves certain values and performs certain checks.


  • Open or short in exhaust gas pressure sensor circuit

  • Exhaust gas pressure sensor

  • ECM

DTC No. DTC Detection Condition Trouble Area
P1131

The fault code is set when the absolute difference between the pressure upstream of the turbine and the charging pressure in after-run mode is greater than 150 mbar (15 kPa).

(3 trip detection logic)

Tech Tips

After-run mode is the period between IG OFF and shut down of ECM (EFI MAIN relay off), when the ECM saves certain values and performs certain checks.


  • Open or short in exhaust gas pressure sensor circuit

  • Exhaust gas pressure sensor

  • ECM

Related Data List
DTC No. Data List

P1072

P1131


  • Absolute Turbine Upstream Pressure

  • Atmosphere Pressure

WIRING DIAGRAM

Refer to DTC P0471 Click here.

CAUTION / NOTICE / HINT

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. READ VALUE USING GTS (ABSOLUTE TURBINE UPSTREAM PRESSURE AND ATMOSPHERE PRESSURE)


    1. Connect the GTS to the DLC3.

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

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / Absolute Turbine Upstream Pressure and Atmosphere Pressure.

    4. Read the value immediately after stopping the engine.

      Standard
      Difference between the Absolute Turbine Upstream Pressure and Atmosphere Pressure is within 8 kPa or less.

      Tech Tips

      Standard atmospheric pressure is 101 kPa. For every 100 m increase in altitude, pressure drops by 1 kPa. Varies by weather.


    NG
    OK
  2. CHECK EXHAUST GAS PRESSURE SENSOR AIR HOSE CONNECTION


    1. Check that the exhaust gas pressure sensor air hose is securely installed.

      OK
      Part is securely installed.

    NG
    OK
  3. 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
      B110-1 (VC) - B91-24 (VCPE) Always Below 1 Ω
      B110-2 (PEXM) - B91-103 (PEXM) Always Below 1 Ω
      B110-3 (E2) - B91-135 (EPEM) Always Below 1 Ω
      B110-1 (VC) or B91-24 (VCPE) - Body ground Always 10 kΩ or higher
      B110-2 (PEXM) or B91-103 (PEXM) - Body ground Always 10 kΩ or higher

    NG
    OK
  4. REPAIR AIR HOSE


    1. Repair the air hose.


    NEXT
  5. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT
  6. REPLACE EXHAUST GAS PRESSURE SENSOR


    1. Replace the exhaust gas pressure sensor Click here.


    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 Click here.

    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.

    8. Confirm that the DTC is not output again.


    NEXT