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Home >> Lexus >> 2021 >> UX 200 Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> (Meter / Gauge / Display) (Diagnostic Codes & Circuit Tests) >> (Meter / Gauge System) >> Speed Signal Circuit [10/2018 - 07/2022] >> Procedure

Speed Signal Circuit [10/2018 - 07/2022]: Procedure

  1. INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE) 
    1. for HV Model:
      GTY812864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))
      1. Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.
      2. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Switch Condition Specified Condition
        A37-11 (SP1) - Body ground Ignition switch ON 11 to 14 V
    2. for Gasoline Model:
      GTY792447Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Actuator Assembly))
      1. Disconnect the skid control ECU (Brake Actuator Assembly) connector.
      2. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Switch Condition Specified Condition
        A38-34 (SP1) - Body ground Ignition switch ON 11 to 14 V

      Result

      Result Proceed to
      OK (for HV Model) A
      OK (for Gasoline Model) B
      NG (for HV Model) C
      NG (for Gasoline Model) D

    Result: 

    B 

    See step  5

    Result: 

    C 

    See step  8

    Result: 

    D 

    See step  9

    Result: 

    A 

    See step  2

  2. INSPECT SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) (OUTPUT WAVEFORM) 
    GTY797412Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Combination Meter Assembly)
    1. Connect the A37 skid control ECU (brake booster with master cylinder assembly) connector.
    2. Remove the combination meter assembly with the connector(s) still connected.
    3. Check the signal waveform according to the condition(s) in the table below.
      Item Condition
      Tester connection F23-20 (SI) - Body ground
      Tool setting 5 V/DIV., 20 ms./DIV.
      Condition Ignition switch to ON, wheel being rotated

      OK

      The waveform is similar to that shown in the illustration.

      HINT: 

      When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY). Refer to  REMOVAL [10/2018 - 07/2022] 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (EACH ECU - COMBINATION METER ASSEMBLY) 
    1. Disconnect the A48 parking brake ECU (brake actuator assembly) connector.
    2. Disconnect the F44 certification ECU (smart key ECU assembly) connector.
    3. Disconnect the F12 stereo component amplifier assembly connector.
    4. Disconnect the F1 radio receiver assembly connector.
    5. Disconnect the F5 navigation ECU*1 connector.
    6. Disconnect the F23 combination meter assembly connector.
    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A48-27 (SPD) - F23-19 (+S) Always Below 1 Ω
      F44-19 (SPD) - F23-19 (+S) Always Below 1 Ω
      F12-17 (SPD) - F23-19 (+S) Always Below 1 Ω
      F1-27 (SPD) - F23-19 (+S) Always Below 1 Ω
      F5-9 (SPD) - F23-19 (+S)*1 Always Below 1 Ω
      A48-27 (SPD), F44-19 (SPD), F12-17 (SPD), F1-27 (SPD), F5-9 (SPD)*1 or F23-19 (+S) - Body ground Always 10 kΩ or higher
      1. *1: w/ Navigation System

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM) 
    GTY797411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Combination Meter Assembly)
    1. Connect the combination meter assembly connector.
    2. Connect a positive (+) lead from the auxiliary battery to any of the following terminals:
      • A48-27 (SPD) parking brake ECU (brake actuator assembly) connector
      • F44-19 (SPD) certification ECU (smart key ECU assembly) connector
      • F12-17 (SPD) stereo component amplifier assembly connector
      • G5-27 (SPD) radio receiver assembly connector
      • F5-9 (SPD) navigation ECU*1 connector
        1. *1: w/ Navigation System
    3. Check the signal waveform according to the condition(s) in the table below.
      Item Condition
      Tester connection F23-19 (+S) - Body ground
      Tool setting 5 V/DIV., 20 ms./DIV.
      Condition Ignition switch to ON, wheel being rotated

      OK

      The waveform is similar to that shown in the illustration.

      HINT: 

      • When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.
      • If the result is OK, an internal malfunction of a connected ECU can be suspected.
      • If the result is NG, an internal malfunction of the combination meter assembly can be suspected.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE DEFECTIVE ECU 

    Result: 

    NG 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2018 - 07/2022] 

  5. INSPECT SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) (OUTPUT WAVEFORM) 
    GTY797414Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Combination Meter Assembly)
    1. Connect the A38 skid control ECU (brake actuator assembly) connector.
    2. Remove the combination meter assembly with the connector(s) still connected.
    3. Check the signal waveform according to the condition(s) in the table below.
      Item Condition
      Tester connection F23-20 (SI) - Body ground
      Tool setting 5 V/DIV., 20 ms./DIV.
      Condition Ignition switch to ON, wheel being rotated

      OK

      The waveform is similar to that shown in the illustration.

      HINT: 

      When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [10/2018 - 07/2022] 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (EACH ECU - COMBINATION METER ASSEMBLY) 
    1. Disconnect the A36 ECM connector.
    2. Disconnect the C36 TCM connector.
    3. Disconnect the F44 certification ECU (smart key ECU assembly) connector.
    4. Disconnect the F12 stereo component amplifier assembly connector.
    5. Disconnect the F1 radio receiver assembly connector.
    6. Disconnect the F5 navigation ECU*1 connector.
    7. Disconnect the F23 combination meter assembly connector.
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A36-42 (SPD) - F23-19 (+S) Always Below 1 Ω
      C36-42 (SPD) - F23-19 (+S) Always Below 1 Ω
      F44-19 (SPD) - F23-19 (+S) Always Below 1 Ω
      F12-17 (SPD) - F23-19 (+S) Always Below 1 Ω
      F1-27 (SPD) - F23-19 (+S) Always Below 1 Ω
      F5-9 (SPD) - F23-19 (+S)*1 Always Below 1 Ω
      A36-42 (SPD), C36-42 (SPD), F44-19 (SPD), F12-17 (SPD), F1-27 (SPD), F5-9 (SPD)*1 or F23-19 (+S) - Body ground Always 10 kΩ or higher
      1. *1: w/ Navigation System

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM) 
    GTY797411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Combination Meter Assembly)
    1. Connect the combination meter assembly connector.
    2. Connect a positive (+) lead from the auxiliary battery to any of the following terminals:
      • A36-42 (SPD) ECM connector
      • C36-42 (SPD) TCM connector
      • F44-19 (SPD) certification ECU (smart key ECU assembly) connector
      • F12-17 (SPD) stereo component amplifier assembly connector
      • G5-27 (SPD) radio receiver assembly connector
      • F5-9 (SPD) navigation ECU*1 connector
        1. *1: w/ Navigation System
    3. Check the signal waveform according to the condition(s) in the table below.
      Item Condition
      Tester connection F23-19 (+S) - Body ground
      Tool setting 5 V/DIV., 20 ms./DIV.
      Condition Ignition switch to ON, wheel being rotated

      OK

      The waveform is similar to that shown in the illustration.

      HINT: 

      • When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.
      • If the result is OK, an internal malfunction of a connected ECU can be suspected.
      • If the result is NG, an internal malfunction of the combination meter assembly can be suspected.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE DEFECTIVE ECU 

    Result: 

    NG 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2018 - 07/2022] 

  8. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - COMBINATION METER ASSEMBLY) 
    1. Disconnect the F23 combination meter assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A37-11 (SP1) - F23-20 (SI) Always Below 1 Ω
      A37-11 (SP1) or F23-20 (SI) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2018 - 07/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - COMBINATION METER ASSEMBLY) 
    1. Disconnect the F23 combination meter assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A38-34 (SP1) - F23-20 (SI) Always Below 1 Ω
      A38-34 (SP1) or F23-20 (SI) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2018 - 07/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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