SFI SYSTEM(w/o Canister Pump Module), Diagnostic DTC:P026A00

DTC Code DTC Name
P026A00 Charge Air Cooler Efficiency Below Threshold

DESCRIPTION

Refer to DTC P023A12.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P026A00 Charge Air Cooler Efficiency Below Threshold Boost temperature is 85°C (176°F) or higher when intake air flow rate is 30 gm/sec or more (2 trip detection logic).

  • Lack of engine coolant

  • Engine coolant leak

  • Electric water pump assembly

  • Intake air temperature sensor (No. 1 turbo pressure sensor)

  • Intercooler cooling radiator assembly

  • ECM

 Does not come on DTC stored SAE Code: P026A

MONITOR DESCRIPTION

The ECM detects this DTC based on the signals from the intake air temperature sensor (No. 1 turbo pressure sensor). The ECM stores a DTC if the intake air temperature sensor value is outside of the normal range.

CONFIRMATION DRIVING PATTERN

B0074SSE29

  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG).

  3. Turn the GTS on.

  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  5. Turn the engine switch off and wait for at least 30 seconds.

  6. Turn the engine switch on (IG) and turn the GTS on.

  7. Start the engine and warm it up until the engine coolant temperature reaches 70°C (158°F) or higher [A].

  8. Enter the following menus: Powertrain / Engine / Data List / Mass Air Flow Sensor.

  9. Drive the vehicle for at least 100 seconds with an intake air flow rate (Mass Air Flow Sensor) of 30 gm/sec or more [B].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    Tech Tips

    Drive the vehicle under load, such as up a slope or acceleration driving.

  10. Enter the following menus: Powertrain / Engine / Trouble Codes [C].

  11. Read the pending DTCs.

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

  13. Input the DTC: P026A00.

  14. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform steps [B] and [C] again.

WIRING DIAGRAM

Refer to DTC P007A11.

Click here

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P026A00)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.

    5. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTC P026A00 is output A
      DTC P026A00 and other DTCs are output B

      Tech Tips

      If any DTCs other than P026A00 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. READ VALUE USING GTS (INTAKE AIR TEMPERATURE B1S1 (TURBO))


    1. Remove the No. 1 turbo pressure sensor.

      Tech Tips

      Do not disconnect the connector.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Engine / Data List / Intake Air Temperature B1S1 (Turbo).


      Powertrain > Engine > Data List
      Tester Display
      Intake Air Temperature B1S1 (Turbo)

    6. According to the display on the GTS, read the Data List.

      Result
      Result Proceed to
      Other than below A
      Difference between value of Intake Air Temperature B1S1 (Turbo) and actual ambient air temperature is 10°C (18°F) or higher B

    B

    INSPECT NO. 1 TURBO PRESSURE SENSOR (INTAKE AIR TEMPERATURE SENSOR) Click here

    A

  3. CHECK INTERCOOLER COOLING RADIATOR ASSEMBLY


    1. Check for deformation and blockage of the intercooler cooling radiator assembly.

      OK
      Intercooler cooling radiator assembly does not have any deformation or blockage.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE INTERCOOLER COOLING RADIATOR ASSEMBLY

    OK

  4. PERFORM ACTIVE TEST USING GTS (CONTROL THE INTERCOOLER WATER PUMP)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

      Note

      Be sure to perform the inspection with the battery voltage at 11 V or higher.

      Tech Tips

      If the battery voltage is low, the electric water pump assembly may stop operating.

    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Intercooler Water Pump / Data List / Intercooler Water Pump Speed.


      Powertrain > Engine > Active Test
      Active Test Display
      Control the Intercooler Water Pump
      Data List Display
      Intercooler Water Pump Speed

    5. According to the display on the GTS, read the Data List while the Active Test "Control the Intercooler Water Pump" is set to 85%.

      Result
      GTS Operation Intercooler Water Pump Speed Proceed to
      85% 4000 rpm or less A
      7000 rpm or higher B
      Other than above C

    A

    REPLACE ELECTRIC WATER PUMP ASSEMBLY Click here

    C

    CHECK WHETHER DTC OUTPUT RECURS (DTC P026A00) Click here

    B

  5. CHECK COOLANT LEVEL AT RESERVOIR


    1. Check the coolant (for intercooler) level.

      Click here

      Result
      Result Proceed to
      At or below reservoir tank LOW level A
      At or above reservoir tank LOW level B

    B

    REPLACE ELECTRIC WATER PUMP ASSEMBLY Click here

    A

  6. CHECK FOR COOLANT LEAK


    1. Check the turbocharger and intercooler cooling system for coolant leaks.

      Click here

      OK
      No leaks in turbocharger and intercooler cooling system.
      Result
      Proceed to
      OK
      NG

    OK

    ADD COOLANT Click here

    NG

    REPAIR COOLANT LEAK

  7. CHECK WHETHER DTC OUTPUT RECURS (DTC P026A00)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the engine switch off and wait for at least 30 seconds.

    6. Turn the engine switch on (IG).

    7. Turn the GTS on.

    8. Start the engine and warm it up.

    9. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    10. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

    11. Read the pending DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTC P026A00 is output B

    A

    END

    B

    REPLACE ECM Click here

  8. INSPECT NO. 1 TURBO PRESSURE SENSOR (INTAKE AIR TEMPERATURE SENSOR)


    1. Inspect the No. 1 turbo pressure sensor (intake air temperature sensor).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 1 TURBO PRESSURE SENSOR Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (NO. 1 TURBO PRESSURE SENSOR - ECM)


    1. Disconnect the No. 1 turbo 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
      F88-4 (THIM) - F66-107 (THIM) Always Below 1 Ω
      F88-2 (E2) - F66-137 (EPIM) Always Below 1 Ω
      F88-4 (THIM) or F66-107 (THIM) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR