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Speed Signal Circuit: Procedure

  1. INSPECT ECU TERMINAL VOLTAGE (INPUT VOLTAGE) 
    1. Disconnect the L27 connector.
      Fig 1: Measuring Voltage Of ECU Terminal Voltage (Input Voltage)
      GTY339156Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified 0Condition
      L27-15 (+S) - Body ground Power switch on (IG) 4.5 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Combination Meter Sub-assembly)

      HINT: 

      If any of the ECUs specified in the wiring diagram supplies power to the combination meter sub-assembly, the combination meter sub-assembly will output a waveform.

    NG → See step   5 

    OK: Go to next step 

  2. INSPECT COMBINATION METER SUB-ASSEMBLY (OUTPUT VOLTAGE) 
    1. Reconnect the L27 connector.
    2. Disconnect the A58 connector.
      Fig 2: Measuring Voltage Of Combination Meter Sub-Assembly (Output Voltage)
      GTY339198Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A58-11 (SP1) - Body ground Power switch on (IG) 11 to 14 V
      TEXT IN ILLUSTRATION

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

    NG → See step   4 

    OK: Go to next step 

  3. INSPECT SKID CONTROL ECU (INPUT WAVEFORM) 
    1. Check the input waveform.
      Fig 3: Inspecting Skid Control ECU With Waveform Reference
      GTY326051Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Reconnect the A58 connector.
      2. Remove the combination meter sub-assembly with the connector(s) still connected.
      3. Connect an oscilloscope to terminal L27-16 (SI) and body ground.
      4. Turn the power switch on (IG).
      5. Turn a wheel slowly.
      6. Check the signal waveform according to the condition(s) in the table below.
        Item Condition
        Tool setting 5 V/DIV., 20 ms./DIV.
        Vehicle condition Wheel being rotated
        TEXT IN ILLUSTRATION

        *a Component with harness connected
        (Combination Meter Sub-assembly)

        OK

        The waveform is displayed as shown in the illustration above (Fig 3).

        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.

    NG → See step   17 

    OK → See step   16 

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER SUB-ASSEMBLY - SKID CONTROL ECU) 
    1. Disconnect the L27 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A58-11 (SP1) - L27-16 (SI) Always Below 1 Ω
      A58-11 (SP1) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   16 

  5. CHECK HARNESS AND CONNECTOR (COMBINATION METER SUB-ASSEMBLY - JUNCTION CONNECTOR) 
    1. Disconnect the L70 junction connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L27-15 (+S) - L70-32 Always Below 1 Ω
      L27-15 (+S) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR) 
    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 L70 connector.
        Fig 4: Checking Harness And Connector (Junction Connector) With L70 Connector End View
        GTY325596Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Condition Specified Condition
        L70-1 - Body ground Power switch on (IG) 4.5 to 14 V
        L70-2 - Body ground Power switch on (IG) 4.5 to 14 V
        L70-3 - Body ground Power switch on (IG) 4.5 to 14 V
        L70-11 - Body ground Power switch on (IG) 4.5 to 14 V
        L70-21 - Body ground Power switch on (IG) 4.5 to 14 V
        L70-22 - Body ground Power switch on (IG) 4.5 to 14 V
        L70-31 - Body ground Power switch on (IG) 4.5 to 14 V
        TEXT IN ILLUSTRATION

        *a Front view of wire harness connector
        (to Junction Connector)

        Result

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

    B → REPLACE JUNCTION CONNECTOR 

    A: Go to next step 

  7. SYSTEM CHECK 
    1. Select the circuit for which voltage was not present in step 6.

      Result

      Tester Connection System that Uses the Circuit Proceed to
      L70-1 - Body ground Tire pressure Warning System A
      L70-2 - Body ground Safety Connect System*1 B
      L70-11 - Body ground Vehicle Proximity Notification System C
      L70-22 - Body ground Hybrid Control System D
      L70-31 - Body ground Lighting System E
      L70-21 - Body ground Audio/Visual System*2 E
      L70-3 - Body ground Audio/Visual System*3 E
      L70-3 - Body ground Navigation System*4 E
      L70-3 - Body ground Navigation System*2 E
      • *1: w/ Safety Connect System
      • *2: w/ Navigation System (for Navigation Receiver Type)
      • *3: w/o Navigation System
      • *4: w/ Navigation System (for Radio and Display Type)

    B → See step   9 

    C → See step   10 

    D → See step   11 

    E → See step   12 

    A: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU CIRCUIT) 
    1. Disconnect the L4 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L4-2 (SPD) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   18 

  9. CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) CIRCUIT) 
    1. Disconnect the L19 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L19-10 (SPDP) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   19 

  10. CHECK HARNESS AND CONNECTOR (VEHICLE APPROACHING SPEAKER CONTROLLER CIRCUIT) 
    1. Disconnect the L130 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L130-6 (SPD) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   20 

  11. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU CIRCUIT) 
    1. Disconnect the L5 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L5-14 (SPDI) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   21 

  12. SYSTEM CHECK 
    1. Select the circuit for which voltage was not present in step 6.

      Result

      Tester Connection System that Uses the Circuit Proceed to
      L70-31 - Body ground Lighting System A
      L70-21 - Body ground Audio/Visual System*1 B
      L70-3 - Body ground Audio/Visual System*2 C
      L70-3 - Body ground Navigation System*3 C
      L70-3 - Body ground Navigation System*1 C
      • *1: w/ Navigation System (for Navigation Receiver Type)
      • *2: w/o Navigation System
      • *3: w/ Navigation System (for Radio and Display Type)

    B → See step   14 

    C → See step   15 

    A: Go to next step 

  13. CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY CIRCUIT) 
    1. Disconnect the A48 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A48-16 (SPDR) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   22 

  14. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY CIRCUIT) 
    1. Disconnect the L31 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L31-11 (SPD) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   23 

  15. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the L3W8*1 or L35*2, *3 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L38-17 (SPD)*1 - Body ground Always 10 kΩ or higher
      L35-17 (SPD)*2, *3 - Body ground Always 10 kΩ or higher
      • *1: w/ Navigation System (for Navigation Receiver Type)
      • *2: w/o Navigation System
      • *3: w/ Navigation System (for Radio and Display Type)

      Result

      Result Proceed to
      OK (w/ Navigation System (for Navigation Receiver Type)) A
      OK (w/o Navigation System) B
      OK (w/ Navigation System (for Radio and Display Type))
      NG C

    B → See step   24 

    C → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A → See step   25 

  16. REPLACE METER CIRCUIT PLATE. Refer to  DISASSEMBLY 
  17. REPLACE SKID CONTROL ECU. Refer to  REMOVAL 
  18. REPLACE TIRE PRESSURE WARNING ECU. Refer to  REMOVAL 
  19. REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL 
  20. REPLACE VEHICLE APPROACHING SPEAKER CONTROLLER. Refer to  REMOVAL 
  21. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to  REMOVAL 
  22. REPLACE HEADLIGHT LEVELING ECU ASSEMBLY. Refer to  REMOVAL 
  23. REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to  REMOVAL 
  24. REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL 
  25. REPLACE NAVIGATION COMPUTER SUB-ASSEMBLY. Refer to  REMOVAL 
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