LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2020 >> Highlander L, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 52 (Engine Control System (T24A-FTS) - Diagnostic Codes (03 Of 11)) >> SFI System >> DTC P023A-13: Charge Air Cooler Coolant Pump Control Circuit Open [11/2023 - ] >> Procedure

DTC P023A-13: Charge Air Cooler Coolant Pump Control Circuit Open [11/2023 - ]: Procedure

WARNING: This page is about a different car, the 2025 Toyota Highlander, 2024 Toyota Highlander, and 2023 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. PERFORM ACTIVE TEST USING GTS (CONTROL THE INTERCOOLER WATER PUMP) 
    1. Perform the Active Test. Check that the electric water pump assembly is operating (vibrating).

      Powertrain > Engine > Active Test 

      Tester Display
      Control the Intercooler Water Pump

      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 ECM (IWPI VOLTAGE) 
    1. Disconnect the electric water pump assembly connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A89-2 (NWP) - Body ground Ignition switch ON 11 to 14 V
      GTY1250331Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Electric Water Pump Assembly)

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ELECTRIC WATER PUMP ASSEMBLY 

    Refer to REMOVAL [10/2022 - ]

    Result: 

    NG 

    See step  3

  3. 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
      A89-2 (NWP) - C88-46 (IWPI) Always Below 1 Ω
      A89-2 (NWP) or C88-46 (IWPI) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. 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
      A89-1 (PGND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. INSPECT EFI-MAIN NO. 3 RELAY 
    1. Inspect the EFI-MAIN NO. 3 relay.

      Refer to PROCEDURE - Step 5

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE EFI-MAIN NO. 3 RELAY 

    Result: 

    OK 

    See step  6

  6. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ELECTRIC WATER PUMP ASSEMBLY) 
    1. Disconnect the electric water pump assembly connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.
      GTY1250332Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Electric Water Pump Assembly)

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A89-4 (+B) - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ELECTRIC WATER PUMP ASSEMBLY 

    Refer to REMOVAL [10/2022 - ]

    Result: 

    NG 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (POWER SOURCE OF EFI-MAIN NO. 3 RELAY) 
    1. Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Measure the voltage according to the value(s) in the table below.
      GTY1249861Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 EFI-MAIN NO. 3 relay

      Standard Voltage

      Tester Connection Condition Specified Condition
      3 (EFI-MAIN NO. 3 relay) - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - EFI-MAIN NO. 3 RELAY) 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - BODY GROUND) 
    1. Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (EFI-MAIN NO. 3 relay) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - ELECTRIC WATER PUMP ASSEMBLY) 
    1. Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    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
      5 (EFI-MAIN NO. 3 relay) - A89-4 (+B) Always Below 1 Ω
      5 (EFI-MAIN NO. 3 relay) or A89-4 (+B) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 3 RELAY) 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

scientia non olet · About LEMON Manuals