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VC Output Circuit [09/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 500h. 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 [09/2023 - ] 

    Result: 

    A 

    See step  2

  2. CHECK EFI-B NO. 1 FUSE AND EFI-B NO. 2 FUSE VOLTAGE 
    1. Turn the ignition switch to ON.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      1 (EFI-B NO. 1 fuse) - Body ground Ignition switch ON 11 to 14 V
      1 (EFI-B NO. 2 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, +B2 and +B3 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 [09/2023 - ]  

    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 (THROTTLE WITH THROTTLE POSITION SENSOR BODY ASSEMBLY). Refer to  REMOVAL [09/2023 - ] 

    Result: 

    A 

    See step  4

  4. 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 [09/2023 - ] 

    Result: 

    A 

    See step  5

  5. CHECK CONNECTION BETWEEN GTS AND ECM (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT)) 
    1. Disconnect the camshaft position sensor (for intake camshaft) 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 CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT). Refer to  REMOVAL [09/2023 - ] 

    Result: 

    A 

    See step  6

  6. CHECK CONNECTION BETWEEN GTS AND ECM (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT)) 
    1. Disconnect the camshaft position sensor (for exhaust camshaft) 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 CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT). Refer to  REMOVAL [09/2023 - ] 

    Result: 

    A 

    See step  7

  7. CHECK CONNECTION BETWEEN GTS AND ECM (NO. 1 TURBO PRESSURE SENSOR) 
    1. Disconnect the No. 1 turbo 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 NO. 1 TURBO PRESSURE SENSOR. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    A 

    See step  8

  8. CHECK CONNECTION BETWEEN GTS AND ECM (NO. 2 TURBO PRESSURE SENSOR) 
    1. Disconnect the No. 2 turbo 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 NO. 2 TURBO PRESSURE SENSOR. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    A 

    See step  9

  9. CHECK CONNECTION BETWEEN GTS AND ECM (OIL PRESSURE SENSOR (OIL PRESSURE SENDER GAUGE ASSEMBLY)) 
    1. Disconnect the oil 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 OIL PRESSURE SENSOR (OIL PRESSURE SENDER GAUGE ASSEMBLY). Refer to  REMOVAL [09/2023 - ] 

    Result: 

    A 

    See step  10

  10. 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 [09/2023 - ] 

    Result: 

    A 

    See step  11

  11. CHECK CONNECTION BETWEEN GTS AND ECM (PURGE PRESSURE SENSOR) 
    1. Disconnect the purge 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 PURGE PRESSURE SENSOR. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    A 

    See step  12

  12. 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 PRESSURE SENSOR (FOR HIGH PRESSURE SIDE). Refer to  REMOVAL [09/2023 - ] 

    Result: 

    A 

    See step  13

  13. CHECK CONNECTION BETWEEN GTS AND ECM (NO. 2 FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE)) 
    1. Disconnect the No. 2 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 NO. 2 FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE). Refer to  REMOVAL [09/2023 - ] 

    Result: 

    A 

    See step  14

  14. CHECK CONNECTION BETWEEN GTS AND ECM (BALL VALVE POSITION SENSOR) 
    1. Disconnect the water control valve 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 WATER CONTROL VALVE. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    A 

    See step  15

  15. 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 [09/2023 - ] 

    Result: 

    A 

    See step  16

  16. 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 (except Mexico Models) A
      Communication is not possible (for Mexico Models) B
      Communication is possible C

    Result: 

    B 

    See step  18

    Result: 

    C 

    REPLACE FUEL TANK PRESSURE SENSOR. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    A 

    See step  17

  17. CHECK CONNECTION BETWEEN GTS AND ECM (VACUUM SENSOR ASSEMBLY) 
    1. Disconnect the vacuum sensor 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 VACUUM SENSOR ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    A 

    See step  18

  18. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the throttle body with motor assembly connector.
    2. Disconnect the crankshaft position sensor connector.
    3. Disconnect the camshaft position sensor (for intake camshaft) connector.
    4. Disconnect the camshaft position sensor (for exhaust camshaft) connector.
    5. Disconnect the No. 1 turbo pressure sensor connector.
    6. Disconnect the No. 2 turbo pressure sensor connector.
    7. Disconnect the oil pressure sensor connector.
    8. Disconnect the mass air flow meter sub-assembly connector.
    9. Disconnect the purge pressure sensor connector.
    10. Disconnect the fuel pressure sensor (for high pressure side) connector.
    11. Disconnect the No. 2 fuel pressure sensor (for low pressure side) connector.
    12. Disconnect the water control valve connector.
    13. Disconnect the vacuum sensor assembly connector. (except Mexico Models)
    14. Disconnect the canister pump module connector.
    15. Disconnect the fuel tank pressure sensor connectors.
    16. Disconnect the ECM connectors.
    17. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C26-109 (VCTA) - Body ground Always 10 kΩ or higher
      C26-116 (VCNE) - Body ground Always 10 kΩ or higher
      C26-88 (VCV1) - Body ground Always 10 kΩ or higher
      C26-113 (VCE1) - Body ground Always 10 kΩ or higher
      C26-107 (VCPM) - Body ground Always 10 kΩ or higher
      C26-102 (VPTA) - Body ground Always 10 kΩ or higher
      C26-101 (VCPE) - Body ground Always 10 kΩ or higher
      C26-73 (VCVG) - Body ground Always 10 kΩ or higher
      C26-85 (VCPH) - Body ground Always 10 kΩ or higher
      C26-96 (VCPR) - Body ground Always 10 kΩ or higher
      C26-119 (VCPF) - Body ground Always 10 kΩ or higher
      C26-70 (VCFV) - Body ground Always 10 kΩ or higher
      C26-86 (V1PC)* - Body ground Always 10 kΩ or higher
      B77-48 (VCPP) - Body ground Always 10 kΩ or higher
      C27-12 (+B) - 2 (EFI-B NO. 1 fuse) Always Below 1 Ω
      C27-11 (+B2) - 2 (EFI-B NO. 1 fuse) Always Below 1 Ω
      C27-10 (+B3) - 2 (EFI-B NO. 2 fuse) Always Below 1 Ω

      *: except Mexico Models

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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