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Speed Signal Circuit [08/2020 - ]: Procedure

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  1. INSPECT COMBINATION METER ASSEMBLY (INPUT WAVEFORM) 
    GTY981604Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Combination Meter Assembly)
    *b Waveform
    1. Check the signal waveform according to the condition(s) in the table below.
      Item Condition
      Tester connection G16-5 (SI) - Body ground
      Tool setting 5 V/DIV., 20 ms./DIV.
      Condition Engine switch on (IG), wheel being rotated

      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

      Result  Proceed to
      The measured waveform is similar to that in the illustration A
      The measured waveform is not similar to that in the illustration
      (Stuck low)      		 B
      The measured waveform is not similar to that in the illustration
      (Stuck high)      		 C

    Result: 

    B 

    See step  6

    Result: 

    C 

    See step  8

    Result: 

    A 

    See step  2

  2. INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM) 
    GTY1026951Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Combination Meter Assembly)
    *b Waveform
    1. Check the signal waveform according to the condition(s) in the table below.
      Item Condition
      Tester connection G16-6 (+S) - Body ground
      Tool setting 5 V/DIV., 20 ms./DIV.
      Condition Engine switch on (IG), wheel being rotated

      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.
      • The waveform (B) changes depending on the connected ECUs.

      Result

      Result  Proceed to
      The measured waveform is similar to that in the illustration A
      The measured waveform is not similar to that in the illustration
      (Stuck low)      		 B
      The measured waveform is not similar to that in the illustration
      (Stuck high)      		 C

    Result: 

    B 

    See step  4

    Result: 

    C 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - ] 

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (EACH ECU - COMBINATION METER ASSEMBLY) 
    1. Disconnect the A18*1 or A64*2 ECM connector.
    2. Disconnect the G40 certification ECU (smart key ECU assembly) connector.
    3. Disconnect the G3 radio and display receiver assembly connector.
    4. Disconnect the G8 stereo component amplifier assembly*3 connector.
    5. Disconnect the G13 navigation ECU*4 connector.
    6. Disconnect the G16 combination meter assembly connector.
    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A18-39 (SPD) - G16-6 (+S)*1 Always Below 1 Ω
      A64-42 (SPD) - G16-6 (+S)*2 Always Below 1 Ω
      G40-19 (SPD) - G16-6 (+S) Always Below 1 Ω
      G3-27 (SPD) - G16-6 (+S) Always Below 1 Ω
      G8-11 (SPD) - G16-6 (+S)*3 Always Below 1 Ω
      G13-9 (SPD) - G16-6 (+S)*4 Always Below 1 Ω
      1. *1: for 2GR-FKS
      2. *2: for A25A-FKS
      3. *3: for 14 Speakers
      4. *4: w/ Navigation System

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    CHECK THE VOLTAGE AT TERMINAL SPD OR SPDP OF EACH ECU 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. INSPECT EACH ECU (INTERNAL SHORT) 
    GTY985595Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Combination Meter Assembly)
    1. Disconnect one of the connectors below.
      NOTE:

      After disconnecting a connector, perform all steps with all other ECUs connected.

      Terminal No. (Symbol) ECU
      A18*1 ECM
      A64*2
      G40 Certification ECU (smart key ECU assembly)
      G3 Radio and display receiver assembly
      G8*3 Stereo component amplifier assembly
      G13*4 Navigation ECU
      1. *1: for 2GR-FKS
      2. *2: for A25A-FKS
      3. *3: for 14 Speakers
      4. *4: w/ Navigation System
    2. Measure the voltage according to the value(s) in the table below.
      NOTE:

      Make sure to perform this inspection with the wheels stopped.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G16-6 (+S) - Body ground Engine switch on (IG) 4.5 to 14 V
    3. Repeat steps (a) and (b) for each connected ECU.

      HINT: 

      If the voltage changed to the specified voltage after disconnecting a connector, an internal short in the disconnected ECU is suspected.

      Result

      Result  Proceed to
      After performing the inspection procedure for all connectors, the voltage did not change to the specified voltage A
      When disconnecting the connector of the ECM, the voltage changed to the specified voltage B
      When disconnecting the connector of the certification ECU (smart key ECU assembly), the voltage changed to the specified voltage C
      When disconnecting the connector of the radio and display receiver assembly, the voltage changed to the specified voltage D
      When disconnecting the connector of the stereo component amplifier assembly, the voltage changed to the specified voltage
      (for 14 Speakers)      		 E
      When disconnecting the connector of the navigation ECU, the voltage changed to the specified voltage
      (w/ Navigation System)      		 F

    Result: 

    B 

    REPLACE ECM 

    for 2GR-FKS: Refer to REMOVAL [04/2018 - 08/2021] , or refer to REMOVAL [08/2021 - ]

    for A25A-FKS: Refer to REMOVAL [08/2020 - ]

    Result: 

    C 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - ] 

    Result: 

    D 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [04/2018 - ] 

    Result: 

    E 

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - ] 

    Result: 

    F 

    REPLACE NAVIGATION ECU. Refer to  REMOVAL [08/2020 - ] 

    Result: 

    A 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (EACH ECU - COMBINATION METER ASSEMBLY) 
    1. Disconnect the A18*1 or A64*2 ECM connector.
    2. Disconnect the G40 certification ECU (smart key ECU assembly) connector.
    3. Disconnect the G3 radio and display receiver assembly connector.
    4. Disconnect the G8 stereo component amplifier assembly*3 connector.
    5. Disconnect the G13 navigation ECU*4 connector.
    6. Disconnect the G16 combination meter assembly connector.
    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A18-39 (SPD)*1, A64-42 (SPD)*2, G40-19 (SPD), G3-27 (SPD), G8-11 (SPD)*3 or G13-9 (SPD)*4 - G16-6 (+S) Always Below 1 Ω
      A18-39 (SPD)*1, A64-42 (SPD)*2, G40-19 (SPD), G3-27 (SPD), G8-11 (SPD)*3, G13-9 (SPD)*4 or G16-6 (+S) - Body ground Always 10 kΩ or higher
      1. *1: for 2GR-FKS
      2. *2: for A25A-FKS
      3. *3: for 14 Speakers
      4. *4: w/ Navigation System

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE) 
    GTY880785Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Skid Control ECU (Brake Actuator Assembly))
    1. Disconnect the A28 skid control ECU (brake actuator assembly) connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A28-34 (SP1) - Body ground Engine switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - ] 

    Result: 

    NG 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - COMBINATION METER ASSEMBLY) 
    1. Disconnect the G16 combination meter assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A28-34 (SP1) or G16-5 (SI) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - COMBINATION METER ASSEMBLY) 
    1. Disconnect the A28 skid control ECU (brake actuator assembly) connector.
    2. Disconnect the G16 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A28-34 (SP1) - G16-5 (SI) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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