ECD SYSTEM, Diagnostic DTC:P1072 and P1131

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

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P1072

Plausibility Test with Environment Pressure

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)

Tip:

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

Does not come on

DTC stored

P1131

Plausibility Test with Intake Air Pressure

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)

Tip:

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

Does not come on

DTC stored
Table 1. 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

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. 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.

      Powertrain > Engine and ECT > Data List

      Tester Display

      Atmosphere Pressure

      Absolute Turbine Upstream 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.

      Tip:

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

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE EXHAUST GAS PRESSURE SENSORClick here

    OK

  2. CHECK EXHAUST GAS PRESSURE SENSOR AIR HOSE CONNECTION

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

      OK

      Part is securely installed.

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR AIR HOSEClick here

    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

      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

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

  4. REPAIR AIR HOSE

    1. Repair the air hose.

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  5. REPAIR OR REPLACE HARNESS OR CONNECTOR

    1. Repair or replace the harness or connector.

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  6. REPLACE EXHAUST GAS PRESSURE SENSOR

    1. Replace the exhaust gas pressure sensor.

      Click here

    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