METER / GAUGE SYSTEM Vehicle Speed Signal Circuit

DESCRIPTION

The vehicle speed signal consists of pulses sent to the combination meter assembly from the skid control ECU assembly.

WIRING DIAGRAM

A000NQ6E01
A000RA6E03

PROCEDURE


  1. CONFIRM MODEL

    Result
    Result Proceed to
    for LHD A
    for RHD B

    B

    CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

    A

  2. CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY


    • *: w/ Vehicle Proximity Notification System


    1. A000OCKE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the N40 combination meter assembly connector.

    2. Disconnect the 4B junction block connector.

    3. Disconnect the T55 vehicle approaching speaker controller connector.

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N40-19 (+S) - Body ground Power switch on (IG) 4.5 to 14 V
      Result
      Result Proceed to
      OK (w/ Vehicle Proximity Notification System) A
      OK (w/o Vehicle Proximity Notification System) B
      for RHD C

    B

    CHECK POWER MANAGEMENT CONTROL ECU Click here

    C

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - MULTI-MEDIA MODULE RECEIVER ASSEMBLY) Click here

    A

  3. CHECK VEHICLE APPROACHING SPEAKER CONTROLLER


    1. A000OCKE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the N40 combination meter assembly connector.

    2. Disconnect the 4B junction block connector.

    3. Disconnect the N164 multi-media module receiver assembly connector.

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N40-19 (+S) - Body ground Power switch on (IG) 4.5 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR COMBINATION METER ASSEMBLY - VEHICLE APPROACHING SPEAKER CONTROLLER) Click here

    OK

  4. CHECK POWER MANAGEMENT CONTROL ECU


    1. A000P95E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Cowl Side Junction Block RH)

      Disconnect the 4B junction block connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      4B-5 - Body ground Power switch on (IG) 4.5 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK RH - POWER MANAGEMENT CONTROL ECU) Click here

    OK

  5. CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY


    1. A000R5LE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Cowl Side Junction Block RH)

      Disconnect the 4C junction block connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      4C-33 - Body ground Power switch on (IG) 4.5 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK RH - STEREO COMPONENT AMPLIFIER ASSEMBLY) Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - COWL SIDE JUNCTION BLOCK RH)


    1. Disconnect the N40 combination meter assembly connector.

    2. Disconnect the 4B junction block connector.

    3. Disconnect the N164 multi-media module receiver assembly connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      N40-19 (+S) - 4B-3 Always Below 1 Ω
      N40-19 (+S) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT COWL SIDE JUNCTION BLOCK RH


    1. A000QOGE02

      Remove the cowl side junction block RH.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      4B-3 - 4B-5 Always Below 1 Ω
      4B-3 - 4C-33

    NG

    REPLACE COWL SIDE JUNCTION BLOCK RH

    OK

  8. CHECK COMBINATION METER ASSEMBLY


    1. A000QUEE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU Assembly)

      Disconnect the A14 skid control ECU assembly connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A14-23 (SP1) - Body ground Power switch on (IG) 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - SKID CONTROL ECU ASSEMBLY) Click here

    OK

  9. CHECK COMBINATION METER ASSEMBLY


    1. A000N2SE02
      Text in Illustration
      *a

      Component with harness connected

      (Combination Meter Assembly)

      Remove the combination meter assembly with the connector(s) connected.

    2. Connect an oscilloscope to terminal N40-20 (SI) and body ground.

    3. Check the signal waveform according to the condition(s) in the table below.

      Measurement Condition
      Item Condition
      Tester connection N40-20 (SI) - Body ground
      Tool setting 5 V/DIV., 20 ms/DIV.
      Vehicle condition Driving at approximately 20 km/h (12 mph)
      OK
      The waveform displayed is as shown in the illustration.

      Tech Tips

      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.


    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPLACE SKID CONTROL ECU ASSEMBLY Click here

  10. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - MULTI-MEDIA MODULE RECEIVER ASSEMBLY)


    1. Disconnect the N40 combination meter assembly connector.

    2. Disconnect the N164 multi-media module receiver assembly connector.

    3. Disconnect the 4B junction block connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      N40-19 (+S) - N164-56 (SPD) Always Below 1 Ω
      N40-19 (+S) - Body ground Always 10 kΩ or higher

    OK

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK RH - POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the 4B junction block connector.

    2. Disconnect the N91 power management control ECU connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      4B-5 - N91-16 (SPDI) Always Below 1 Ω
      4B-5 - Body ground Always 10 kΩ or higher

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  12. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK RH - STEREO COMPONENT AMPLIFIER ASSEMBLY)


    1. Disconnect the 4C junction block connector.

    2. Disconnect the T40 stereo component amplifier assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      4C-33 - T40-17 (SPD) Always Below 1 Ω
      4C-33 - Body ground Always 10 kΩ or higher

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  13. CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY


    1. A000OCKE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the N40 combination meter assembly connector.

    2. Disconnect the N164 multi-media module receiver assembly connector.

    3. Disconnect the 5B junction block connector.

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N40-19 (+S) - Body ground Power switch on (IG) 4.5 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY) Click here

    OK

  14. CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY


    1. A000OCKE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the N40 combination meter assembly connector.

    2. Disconnect the T40 stereo component amplifier assembly connector.

    3. Disconnect the 5B junction block connector.

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N40-19 (+S) - Body ground Power switch on (IG) 4.5 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - MULTI-MEDIA MODULE RECEIVER ASSEMBLY) Click here

    OK

  15. CHECK POWER MANAGEMENT CONTROL ECU


    1. A000Q5GE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Cowl Side Junction Block LH)

      Disconnect the 5A junction block connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      5A-25 - Body ground Power switch on (IG) 4.5 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - POWER MANAGEMENT CONTROL ECU) Click here

    OK

  16. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - COWL SIDE JUNCTION BLOCK LH)


    1. Disconnect the N40 combination meter assembly connector.

    2. Disconnect the 5B junction block connector.

    3. Disconnect the T40 stereo component amplifier assembly connector.

    4. Disconnect the N164 multi-media module receiver assembly connector.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      N40-19 (+S) - 5B-17 Always Below 1 Ω
      N40-19 (+S) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  17. INSPECT COWL SIDE JUNCTION BLOCK LH


    1. A000T2DE02

      Remove the cowl side junction block LH Click here.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      5B-17 - 5A-25 Always Below 1 Ω

    NG

    REPLACE COWL SIDE JUNCTION BLOCK LH Click here

    OK

  18. CHECK COMBINATION METER ASSEMBLY


    1. A000QUEE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU Assembly)

      Disconnect the A14 skid control ECU assembly connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A14-23 (SP1) - Body ground Power switch on (IG) 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - SKID CONTROL ECU ASSEMBLY) Click here

    OK

  19. CHECK COMBINATION METER ASSEMBLY


    1. A000N2SE02
      Text in Illustration
      *a

      Component with harness connected

      (Combination Meter Assembly)

      Remove the combination meter assembly with the connector(s) connected.

    2. Connect an oscilloscope to terminal N40-20 (SI) and body ground.

    3. Check the signal waveform according to the condition(s) in the table below.

      Measurement Condition
      Item Condition
      Tester connection N40-20 (SI) - Body ground
      Tool setting 5 V/DIV., 20 ms/DIV.
      Vehicle condition Driving at approximately 20 km/h (12 mph)
      OK
      The waveform displayed is as shown in the illustration.

      Tech Tips

      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.


    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPLACE SKID CONTROL ECU ASSEMBLY Click here

  20. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)


    1. Disconnect the N40 combination meter assembly connector.

    2. Disconnect the T40 stereo component amplifier assembly connector.

    3. Disconnect the N164 multi-media module receiver assembly connector.

    4. Disconnect the 5B junction block connector.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      N40-19 (+S) - T40-17 (SPD) Always Below 1 Ω
      N40-19 (+S) - Body ground Always 10 kΩ or higher

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  21. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - MULTI-MEDIA MODULE RECEIVER ASSEMBLY)


    1. Disconnect the N40 combination meter assembly connector.

    2. Disconnect the N164 multi-media module receiver assembly connector.

    3. Disconnect the T40 stereo component amplifier assembly connector.

    4. Disconnect the 5B junction block connector.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      N40-19 (+S) - N164-56 (SPD) Always Below 1 Ω
      N40-19 (+S) - Body ground Always 10 kΩ or higher

    OK

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  22. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the 5A junction block connector.

    2. Disconnect the N91 power management control ECU connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      5A-25 - N91-16 (SPDI) Always Below 1 Ω
      5A-25 - Body ground Always 10 kΩ or higher

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  23. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - SKID CONTROL ECU ASSEMBLY)


    1. Disconnect the N40 combination meter assembly connector.

    2. Disconnect the A14 skid control ECU assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      N40-20 (SI) - A14-23 (SP1) Always Below 1 Ω
      N40-20 (SI) - Body ground Always 10 kΩ or higher

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  24. CHECK HARNESS AND CONNECTOR COMBINATION METER ASSEMBLY - VEHICLE APPROACHING SPEAKER CONTROLLER)


    1. Disconnect the N40 combination meter assembly connector.

    2. Disconnect the 4B junction block connector.

    3. Disconnect the N164 multi-media module receiver assembly connector.

    4. Disconnect the T55 vehicle approaching speaker controller connector.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      N40-19 (+S) - T55-6 (SPD) Always Below 1 Ω
      N40-19 (+S) - Body ground Always 10 kΩ or higher

    OK

    REPLACE VEHICLE APPROACHING SPEAKER CONTROLLER Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR