SFI SYSTEM(for Rear Air Fuel Ratio Sensor), Diagnostic DTC:P023A00, P023A71

DTC Code DTC Name
P023A00 Charge Air Cooler Coolant Pump Control Circuit/Open
P023A71 Charge Air Cooler Coolant Pump Control Actuator Stuck

DESCRIPTION

Refer to DTC P023A12.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P023A00 Charge Air Cooler Coolant Pump Control Circuit/Open The speed of the electric water pump assembly is higher than the target speed by a certain amount or more (2 trip detection logic).

  • Lack of intercooler coolant

  • Intercooler coolant leak

  • Electric water pump assembly

 Does not come on DTC stored SAE Code: P023A
P023A71 Charge Air Cooler Coolant Pump Control Actuator Stuck The speed of the electric water pump assembly is lower than the target speed by a certain amount or more (2 trip detection logic). Electric water pump assembly Does not come on DTC stored SAE Code: P023A

MONITOR DESCRIPTION

The ECM monitors the speed of the electric water pump assembly. If the actual speed exceeds the target speed by a certain amount or more, the ECM determines overspeed operation has occurred. If the actual speed is less than the target speed by a certain amount or more, the ECM determines that the motor is stuck and stores a DTC.

CAUTION / NOTICE / HINT

Tech Tips


  • P023A00 may be stored if there is insufficient coolant in the turbocharger and intercooler cooling system. If there is sufficient coolant in the system and P023A00 is output when the vehicle is brought to the workshop, check if the customer has added coolant in the past.

  • If the electric water pump assembly voltage is extremely high or low, control may be temporarily stopped and P023A71. When the voltage returns to normal, control will resume and it will not be necessary to replace the electric water pump assembly.

  • 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 P023A00 OR P023A71)


    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 P023A00 or P023A71 is output A
      DTC P023A00 or P023A71 and other DTCs are output B

      Tech Tips

      If any DTCs other than P023A00 or P023A71 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. 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 more.

      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

      Tech Tips


      • If the electric water pump assembly voltage is extremely high or low, control may be temporarily stopped and a DTC stored.

      • The coolant will freeze at -15°C (5°F) at 30% coolant concentration and at -35°C (-31°F) at 50% coolant concentration.

      • DTC P023A71 will be stored if the electric water pump assembly cannot rotate due to freezing of the coolant.

      • If DTC P023A71 is stored due to freezing of the coolant, the problem cannot be reproduced. Judge whether freezing of the coolant occurred from the coolant replacement history and the ambient temperature when the DTC was stored.


    B

    CHECK COOLANT LEVEL AT RESERVOIR Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  3. REPLACE ELECTRIC WATER PUMP ASSEMBLY


    1. Replace the electric water pump assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 8 Click here

  4. 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

    GO TO STEP 7 Click here

    A

  5. 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

    GO TO STEP 7 Click here

    NG

  6. REPAIR COOLANT LEAK


    1. Repair any coolant leaks.

      Result
      Proceed to
      NEXT

    NEXT

  7. BLEED AIR


    1. Bleed the air and add coolant up to the FULL Line on the reservoir tank.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  8. 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 more.

      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%.

      OK
      The value of Intercooler Water Pump Speed is 4000 to 7000 rpm.
      Result
      Proceed to
      NEXT

    NEXT

    END