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Speed Signal Circuit [08/2015 - 08/2019]: Procedure

  1. CHECK ECU TERMINAL VOLTAGE (INPUT VOLTAGE) 
    1. Disconnect the F14 combination meter assembly connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY722396Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      F14-28 (+S) - Body ground Ignition switch ON 4.5 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Combination Meter Assembly)

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  2

  2. CHECK COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE) 
    1. For 4WD:
      1. Disconnect the A6 master cylinder solenoid (skid control ECU) connector.
      2. Measure the voltage according to the value(s) in the table below.
        GTY734656Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard Voltage

        Tester Connection Switch Condition Specified Condition
        A6-12 (SP1) - Body ground Ignition switch ON 11 to 14 V
        TEXT IN ILLUSTRATION

        *a Front view of wire harness connector
        (to Master Cylinder Solenoid (Skid Control ECU))
    2. For 2WD:
      1. Disconnect the A53 skid control ECU (brake actuator assembly) connector.
      2. Measure the voltage according to the value(s) in the table below.
        GTY710292Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard Voltage

        Tester Connection Switch Condition Specified Condition
        A53-11 (SP1) - Body ground Ignition switch ON 11 to 14 V
        TEXT IN ILLUSTRATION

        *a Front view of wire harness connector
        (to Skid Control ECU (Brake Actuator Assembly))

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  3

  3. CHECK COMBINATION METER ASSEMBLY (SPEED SIGNAL) 
    1. Check the input waveform.
      GTY736799Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Reconnect the F14 combination meter assembly connector.
      2. Remove the combination meter assembly with the connector(s) still connected.
      3. Connect an oscilloscope to terminal F14-29 (SI) and body ground.
      4. Turn the ignition switch to ON.
      5. Check the signal waveform according to the condition(s) in the table below.
        MEASUREMENT CONDITION

        Item Condition
        Terminal No. (Symbol) F14-29 (SI) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition Driving at approx. 20 km/h (12 mph)

        OK

        The waveform displayed is as 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

      Result Proceed to
      OK A
      NG (for 4WD) B
      NG (for 2WD) C

    Result: 

    A 

    REPLACE COMBINATION METER ASSEMBLY 

    (Refer to REMOVAL [08/2015 - 08/2022] )

    Result: 

    B 

    REPLACE MASTER CYLINDER SOLENOID (SKID CONTROL ECU) 

    (Refer to DISASSEMBLY [08/2015 - ] )

    Result: 

    C 

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) 

    (Refer to REMOVAL [08/2015 - 08/2019] )

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - SKID CONTROL ECU) 
    1. Disconnect the F14 combination meter assembly connector.
    2. Disconnect the A6 master cylinder solenoid (skid control ECU)*1 or A53 skid control ECU (brake actuator assembly)*2 connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F14-29 (SI) - A6-12 (SP1)*1
      F14-29 (SI) - A53-11 (SP1)*2      		 Always Below 1 Ω
      A6-12 (SP1) - Body ground*1
      A53-11 (SP1) - Body ground*2      		 Always 10 kΩ or higher
      1. *1: for 4WD
      2. *2: for 2WD

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    (Refer to REMOVAL [08/2015 - 08/2022] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - NO. 4 JUNCTION BLOCK) 
    1. Disconnect the F14 combination meter assembly connector.
    2. Disconnect the 4B No. 4 junction block connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F14-28 (+S) - 4B-20 Always Below 1 Ω
      F14-28 (+S) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (NO. 4 JUNCTION BLOCK) 
    1. Inspect for a short in the circuit that is connected to the junction block connector shown in the wiring diagram.

      HINT: 

      If voltage is not present, it is possible that an ECU or circuit has a malfunction. The malfunctioning ECU or circuit will be diagnosed in the following steps.

      1. Disconnect the 4A No. 4 junction block connector.
        GTY722827Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        *1 No. 4 Junction Block - -
        *a Front view of wire harness connector
        (to No. 4 Junction Block)        		 - -
      2. Disconnect the 4C No. 4 junction block connector.
      3. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Switch Condition Specified Condition
        4C-16 - Body ground Ignition switch ON 4.5 to 14 V
        4B-8 - Body ground Ignition switch ON 4.5 to 14 V
        4A-90 - Body ground Ignition switch ON 4.5 to 14 V
        RESULT

        Result Proceed to
        Voltage is not present in one circuit A
        Voltage is present in all the circuits B

    Result: 

    B 

    REPLACE NO. 4 JUNCTION BLOCK 

    Result: 

    A 

    See step  7

  7. SYSTEM CHECK 
    1. Select the circuit for which voltage was not present in the previous step.
      RESULT

      Tester Connection System that Uses the Circuit Proceed to
      4C-16 - Body ground SFI system, smart key system*1, safety connect system*2, voltage inverter*1, intuitive parking assist system*3 A
      4B-8 - Body ground Tire pressure warning system B
      4A-90 - Body ground Audio and visual system or navigation system C
      1. *1: w/ Smart Key System
      2. *2: w/ Safety Connect System
      3. *3: w/ Intuitive Parking Assist System

    Result: 

    B 

    See step  16

    Result: 

    C 

    See step  17

    Result: 

    A 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (NO. 4 JUNCTION BLOCK - NO. 5 JUNCTION BLOCK) 
    1. Disconnect the 4C No. 4 junction block connector.
    2. Disconnect the 5B No. 5 junction block connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4C-16 - 5B-25 Always Below 1 Ω
      4C-16 - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (NO. 5 JUNCTION BLOCK) 
    1. Disconnect the 5A No. 5 junction block connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      5B-2 - 5A-13 Always Below 1 Ω
      5B-2 - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (NO. 5 JUNCTION BLOCK) 
    1. Inspect for a short in the circuit that is connected to the junction block connector shown in the wiring diagram.
      1. Disconnect the 5C No. 5 junction block connector.
        GTY722385Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        *1 No. 5 Junction Block - -
        *a Front view of wire harness connector
        (to No. 5 Junction Block)        		 - -
      2. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Switch Condition Specified Condition
        5B-14 - Body ground Ignition switch ON 4.5 to 14 V
        5C-1 - Body ground*1 Ignition switch ON 4.5 to 14 V
        5A-1 - Body ground*1 Ignition switch ON 4.5 to 14 V
        5A-38 - Body ground*2 Ignition switch ON 4.5 to 14 V
        5A-73 - Body ground*3 Ignition switch ON 4.5 to 14 V
        1. *1: w/ Smart Key System
        2. *2: w/ Safety Connect System
        3. *3: w/ Intuitive Parking Assist System
        RESULT

        Result Proceed to
        Voltage is not present in one circuit A
        Voltage is present in all the circuits B

    Result: 

    B 

    REPLACE NO. 5 JUNCTION BLOCK 

    Result: 

    A 

    See step  11

  11. SYSTEM CHECK 
    1. Select the circuit for which voltage was not present in the previous step.
      RESULT

      Tester Connection System that Uses the Circuit Proceed to
      5B-14 - Body ground SFI system A
      5C-1 - Body ground*1 Voltage inverter B
      5A-1 - Body ground*1 Smart key system C
      5A-38 - Body ground*2 Safety connect system D
      5A-73 - Body ground*3 Intuitive Parking Assist System E
      1. *1: w/ Smart Key System
      2. *2: w/ Safety Connect System
      3. *3: w/ Intuitive Parking Assist System

    Result: 

    B 

    See step  13

    Result: 

    C 

    See step  14

    Result: 

    D 

    See step  15

    Result: 

    E 

    See step  20

    Result: 

    A 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (ECM CIRCUIT) 
    1. Disconnect the F51 ECM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F51-18 (SPD) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE ECM 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  13. CHECK HARNESS AND CONNECTOR (VOLTAGE INVERTER ASSEMBLY CIRCUIT) 
    1. Disconnect the N19 voltage inverter assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      N19-2 (SPD) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE VOLTAGE INVERTER ASSEMBLY 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  14. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU CIRCUIT) 
    1. Disconnect the F80 power management control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F80-23 (SPD) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE POWER MANAGEMENT CONTROL ECU 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  15. CHECK HARNESS AND CONNECTOR (TELEMATICS TRANSCEIVER CIRCUIT) 
    1. Disconnect the F39 telematics transceiver connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F39-10 (SPDP) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE TELEMATICS TRANSCEIVER 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  16. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU CIRCUIT) 
    1. Disconnect the F7 tire pressure warning ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F7-2 (SPD) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE TIRE PRESSURE WARNING ECU 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  17. SYSTEM CHECK 
    1. Proceed to the appropriate inspection based on the components of the vehicle.
      COMPONENT

      Component Proceed to
      For Navigation Receiver Type A
      For Radio and Display Type B
      For 9 Speakers Type C

    Result: 

    B 

    See step  19

    Result: 

    C 

    See step  21

    Result: 

    A 

    See step  18

  18. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER CIRCUIT) 
    1. Disconnect the G37 navigation receiver connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      G37-17 (SPD) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE NAVIGATION RECEIVER ASSEMBLY 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS AND CONNECTOR 

  19. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER CIRCUIT) 
    1. Disconnect the G49 radio and display receiver connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      G49-17 (SPD) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  20. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU CIRCUIT) 
    1. Disconnect the F95 clearance warning ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F95-5 (SPD) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE CLEARANCE WARNING ECU ASSEMBLY 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  21. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY) 
    1. Disconnect the N11 stereo component amplifier connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      N11-11 (SPD) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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