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Home >> Lexus >> 2024 >> RC 350 Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 23 (Engine Control System (8AR-FTS) - Diagnostic Codes (04 Of 10)) >> SFI System >> DTC P023A-12: Charge Air Cooler Coolant Pump Control Circuit Short to Battery; DTC P023A-13: Charge Air Cooler Coolant Pump Control Circuit Open; DTC P023A-14: Charge Air Cooler Coolant Pump Control Circuit Short to Ground or Open [10/2015 - ] >> Procedure

DTC P023A-12: Charge Air Cooler Coolant Pump Control Circuit Short to Battery; DTC P023A-13: Charge Air Cooler Coolant Pump Control Circuit Open; DTC P023A-14: Charge Air Cooler Coolant Pump Control Circuit Short to Ground or Open [10/2015 - ]: Procedure

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  1. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INTERCOOLER WATER PUMP) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Intercooler Water Pump.

      Powertrain > Engine > Active Test 

      Tester Display
      Control the Intercooler Water Pump
    5. According to the display on the Techstream, perform the Active Test and check that the electric water pump assembly operates.

      OK

      The electric water pump assembly is operating (vibrating).

      HINT: 

      Use a sound scope if the operation is difficult to check.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (ELECTRIC WATER PUMP ASSEMBLY - ECM) 
    1. Disconnect the electric water pump assembly 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
      A78-2 (NWP) - A82-11 (IWPI) Always Below 1 Ω
      A78-3 (SWP) - A82-24 (IWPO) Always Below 1 Ω
      A78-2 (NWP) or A82-11 (IWPI) - Body ground and other terminals Always 10 kΩ or higher
      A78-3 (SWP) or A82-24 (IWPO) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ELECTRIC WATER PUMP ASSEMBLY) 
    GTY680839Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Electric Water Pump Assembly)
    1. Disconnect the electric water pump assembly connector.
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A78-2 (NWP) - Body ground Engine switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ELECTRIC WATER PUMP ASSEMBLY. Refer to  REMOVAL [10/2015 - ] 

    Result: 

    NG 

    REPLACE ECM. Refer to  REMOVAL [10/2015 - ] 

  4. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ELECTRIC WATER PUMP ASSEMBLY) 
    GTY650302Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Electric Water Pump Assembly)
    1. Disconnect the electric water pump assembly connector.
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A78-4 (+B) - Body ground Engine switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (ELECTRIC WATER PUMP ASSEMBLY - BODY GROUND) 
    1. Disconnect the electric water pump assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A78-1 (PGND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (ELECTRIC WATER PUMP ASSEMBLY - ECM) 
    1. Disconnect the electric water pump assembly 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
      A78-2 (NWP) - A82-11 (IWPI) Always Below 1 Ω
      A78-3 (SWP) - A82-24 (IWPO) Always Below 1 Ω
      A78-2 (NWP) or A82-11 (IWPI) - Body ground and other terminals Always 10 kΩ or higher
      A78-3 (SWP) or A82-24 (IWPO) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. REPLACE ELECTRIC WATER PUMP ASSEMBLY 
    1. Replace the electric water pump assembly.

      Refer to REMOVAL [10/2015 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  8

  8. CHECK WHETHER DTC OUTPUT RECURS (DTC P023A-12, P023A-13 OR P023A-14) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

    5. Turn the engine switch off and wait for at least 30 seconds.
    6. Start the engine and warm it up.
    7. Turn the Techstream on.
    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
    10. Input the DTC: P023A-12, P023A-13 or P023A-14.
    11. Check the DTC judgment result.

      Result

      Result Proceed to
      NORMAL
      (DTCs are not output)      		 A
      ABNORMAL
      (DTC P023A-12, P023A-13 or P023A-14 is output)      		 B

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE ECM. Refer to  REMOVAL [10/2015 - ] 

  9. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - ELECTRIC WATER PUMP ASSEMBLY) 
    1. Disconnect the semiconductor pwr integration ECU connector.
    2. Disconnect the electric water pump assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2F-1 - A78-4 (+B) Always Below 1 Ω
      2F-1 or A78-4 (+B) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [09/2014 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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