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VC Output Circuit [12/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 550h+. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK CONNECTION BETWEEN GTS AND ECM 
    1. Check the communication between the GTS and ECM.

      HINT: 

      It can be checked using the "Engine" item of the Data List.

      Result

      Result Proceed to
      Communication is not possible A
      Communication is possible B

    Result: 

    B 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2023 - ] 

    Result: 

    A 

    See step  2

  2. CHECK EFI NO. 8 FUSE VOLTAGE 
    1. Turn the ignition switch ON.
    2. Measure the voltage according to the value(s) in the table below.
      GTY1239578Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 2 Engine Room Relay Block and No. 2 Junction Block Assembly
      *2 EFI NO. 8 Fuse

      Standard Voltage

      Tester Connection Condition Specified Condition
      1 (EFI NO. 8 fuse) - Body ground Ignition switch ON 11 to 14 V

      HINT: 

      • Check the fuse with it installed to the No. 1 engine room relay block and No. 1 junction block assembly.
      • If the result is not as specified, since current is not flowing to the +B and +B2 terminals of the ECM, the system may not be started.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO ECM POWER SOURCE CIRCUIT. Refer to  ECM Power Source Circuit [12/2023 - ]  

    Result: 

    OK 

    See step  3

  3. CHECK CONNECTION BETWEEN GTS AND ECM (THROTTLE POSITION SENSOR) 
    1. Disconnect the throttle body with motor assembly connector.
    2. Check the communication between the GTS and ECM.

      HINT: 

      It can be checked using the "Engine" item of the Data List.

      Result

      Result Proceed to
      Communication is not possible A
      Communication is possible B

    Result: 

    B 

    REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  4

  4. CHECK CONNECTION BETWEEN GTS AND ECM (VVT SENSOR (FOR INTAKE CAMSHAFT OF BANK 1)) 
    1. Disconnect the VVT sensor (for intake camshaft of bank 1) connector.
    2. Check the communication between the GTS and ECM.

      HINT: 

      It can be checked using the "Engine" item of the Data List.

      Result

      Result Proceed to
      Communication is not possible A
      Communication is possible B

    Result: 

    B 

    REPLACE VVT SENSOR (FOR INTAKE CAMSHAFT OF BANK 1). Refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  5

  5. CHECK CONNECTION BETWEEN GTS AND ECM (VVT SENSOR (FOR INTAKE CAMSHAFT OF BANK 2)) 
    1. Disconnect the VVT sensor (for intake camshaft of bank 2) connector.
    2. Check the communication between the GTS and ECM.

      HINT: 

      It can be checked using the "Engine" item of the Data List.

      Result

      Result Proceed to
      Communication is not possible A
      Communication is possible B

    Result: 

    B 

    REPLACE VVT SENSOR (FOR INTAKE CAMSHAFT OF BANK 2). Refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  6

  6. CHECK CONNECTION BETWEEN GTS AND ECM (VVT SENSOR (FOR EXHAUST CAMSHAFT OF BANK 1)) 
    1. Disconnect the VVT sensor (for exhaust camshaft of bank 1) connector.
    2. Check the communication between the GTS and ECM.

      HINT: 

      It can be checked using the "Engine" item of the Data List.

      Result

      Result Proceed to
      Communication is not possible A
      Communication is possible B

    Result: 

    B 

    REPLACE VVT SENSOR (FOR EXHAUST CAMSHAFT OF BANK 1). Refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  7

  7. CHECK CONNECTION BETWEEN GTS AND ECM (VVT SENSOR (FOR EXHAUST CAMSHAFT OF BANK 2)) 
    1. Disconnect the VVT sensor (for exhaust camshaft of bank 2) connector.
    2. Check the communication between the GTS and ECM.

      HINT: 

      It can be checked using the "Engine" item of the Data List.

      Result

      Result Proceed to
      Communication is not possible A
      Communication is possible B

    Result: 

    B 

    REPLACE VVT SENSOR (FOR EXHAUST CAMSHAFT OF BANK 2). Refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  8

  8. CHECK CONNECTION BETWEEN GTS AND ECM (CRANKSHAFT POSITION SENSOR) 
    1. Disconnect the crankshaft position sensor connector.
    2. Check the communication between the GTS and ECM.

      HINT: 

      It can be checked using the "Engine" item of the Data List.

      Result

      Result Proceed to
      Communication is not possible A
      Communication is possible B

    Result: 

    B 

    REPLACE CRANKSHAFT POSITION SENSOR. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  9

  9. CHECK CONNECTION BETWEEN GTS AND ECM (FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE)) 
    1. Disconnect the fuel pressure sensor (for high pressure side) connector.
    2. Check the communication between the GTS and ECM.

      HINT: 

      It can be checked using the "Engine" item of the Data List.

      Result

      Result Proceed to
      Communication is not possible A
      Communication is possible B

    Result: 

    B 

    REPLACE FUEL DELIVERY PIPE WITH SENSOR ASSEMBLY LH (FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE)). Refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  10

  10. CHECK CONNECTION BETWEEN GTS AND ECM (FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE)) 
    1. Disconnect the fuel pressure sensor (for low pressure side) connector.
    2. Check the communication between the GTS and ECM.

      HINT: 

      It can be checked using the "Engine" item of the Data List.

      Result

      Result Proceed to
      Communication is not possible A
      Communication is possible B

    Result: 

    B 

    REPLACE FUEL DELIVERY PIPE WITH SENSOR ASSEMBLY (FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE)). Refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  11

  11. CHECK CONNECTION BETWEEN GTS AND ECM (MANIFOLD ABSOLUTE PRESSURE SENSOR) 
    1. Disconnect the manifold absolute pressure sensor connector.
    2. Check the communication between the GTS and ECM.

      HINT: 

      It can be checked using the "Engine" item of the Data List.

      Result

      Result Proceed to
      Communication is not possible A
      Communication is possible B

    Result: 

    B 

    REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  12

  12. CHECK CONNECTION BETWEEN GTS AND ECM (MASS AIR FLOW METER SUB-ASSEMBLY) 
    1. Disconnect the mass air flow meter sub-assembly connector.
    2. Check the communication between the GTS and ECM.

      HINT: 

      It can be checked using the "Engine" item of the Data List.

      Result

      Result Proceed to
      Communication is not possible A
      Communication is possible B

    Result: 

    B 

    REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  13

  13. CHECK CONNECTION BETWEEN GTS AND ECM (FUEL TANK PRESSURE SENSOR) 
    1. Disconnect the fuel tank pressure sensor connector.
    2. Check the communication between the GTS and ECM.

      HINT: 

      It can be checked using the "Engine" item of the Data List.

      Result

      Result Proceed to
      Communication is not possible A
      Communication is possible B

    Result: 

    B 

    REPLACE FUEL TANK PRESSURE SENSOR. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  14

  14. CHECK CONNECTION BETWEEN GTS AND ECM (CANISTER PUMP MODULE) 
    1. Disconnect the canister pump module connector.
    2. Check the communication between the GTS and ECM.

      HINT: 

      It can be checked using the "Engine" item of the Data List.

      Result

      Result Proceed to
      Communication is not possible A
      Communication is possible B

    Result: 

    B 

    REPLACE CANISTER PUMP MODULE. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  15

  15. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the throttle body with motor assembly connector.
    2. Disconnect the VVT sensor (for intake camshaft of bank 1) connector.
    3. Disconnect the VVT sensor (for intake camshaft of bank 2) connector.
    4. Disconnect the VVT sensor (for exhaust camshaft of bank 1) connector.
    5. Disconnect the VVT sensor (for exhaust camshaft of bank 2) connector.
    6. Disconnect the crankshaft position sensor connector.
    7. Disconnect the fuel pressure sensor (for high pressure side) connector.
    8. Disconnect the fuel pressure sensor (for low pressure side) connector.
    9. Disconnect the manifold absolute pressure sensor connector.
    10. Disconnect the mass air flow meter sub-assembly connector.
    11. Disconnect the canister pump module connector.
    12. Disconnect the fuel tank pressure sensor connector.
    13. Disconnect the ECM connectors.
    14. Remove the EFI-MAIN NO. 2 and A/F HTR relay from the No. 1 engine room relay block and No. 1 junction block assembly.

      HINT: 

      Remove the EFI-MAIN No. 2 relay and A/F HTR relay connected between the checked terminals as the coil inside the relay influences the measurement value.

    15. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C86-121 (VCTA) - Body ground Always 10 kΩ or higher
      C86-99 (VCV1) - Body ground Always 10 kΩ or higher
      C86-98 (VCV2) - Body ground Always 10 kΩ or higher
      C86-140 (VCE1) - Body ground Always 10 kΩ or higher
      C86-139 (VCE2) - Body ground Always 10 kΩ or higher
      C86-96 (VCNE) - Body ground Always 10 kΩ or higher
      C86-119 (VCPR) - Body ground Always 10 kΩ or higher
      C86-111 (VCPF) - Body ground Always 10 kΩ or higher
      C86-77 (VCPM) - Body ground Always 10 kΩ or higher
      C86-90 (VCVG) - Body ground Always 10 kΩ or higher
      B86-56 (VPTK) - Body ground Always 10 kΩ or higher
      B86-35 (VCPP) - Body ground Always 10 kΩ or higher
      B86-2 (+B) - 1 (EFI NO. 8 fuse) Always Below 1 Ω
      B86-3 (+B2) - 1 (EFI NO. 8 fuse) Always Below 1 Ω
      B86-2 (+B) - Body ground Always 10 kΩ or higher
      B86-3 (+B2) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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