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

A01FQUWE02
A01FUFXE02

INSPECTION PROCEDURE

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


    1. A01FTH0E01
      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. 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

  3. CHECK POWER MANAGEMENT CONTROL ECU


    1. A01FV4IE01
      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

  4. CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY


    1. A01FSFDE01
      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

  5. 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 N68 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

  6. INSPECT COWL SIDE JUNCTION BLOCK RH


    1. A01FPZ0E01

      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

  7. CHECK COMBINATION METER ASSEMBLY


    1. A01FQ9RE01
      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

  8. CHECK COMBINATION METER ASSEMBLY


    1. A01FUWKE01
      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.


    NG

    REPLACE SKID CONTROL ECU ASSEMBLY Click here

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

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


    1. Disconnect the N40 combination meter assembly connector.

    2. Disconnect the N68 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) - N68-56 (SPD) Always Below 1 Ω
      N40-19 (+S) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

  10. 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  11. 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

  12. CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY


    1. A01FTH0E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the N40 combination meter assembly connector.

    2. Disconnect the N68 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

  13. CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY


    1. A01FTH0E01
      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

  14. CHECK POWER MANAGEMENT CONTROL ECU


    1. A01FTAWE01
      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

  15. 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 N68 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

  16. INSPECT COWL SIDE JUNCTION BLOCK LH


    1. A01FUMCE01

      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

  17. CHECK COMBINATION METER ASSEMBLY


    1. A01FQ9RE01
      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

  18. CHECK COMBINATION METER ASSEMBLY


    1. A01FUWKE01
      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.


    NG

    REPLACE SKID CONTROL ECU ASSEMBLY Click here

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

  19. 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 N68 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

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


    1. Disconnect the N40 combination meter assembly connector.

    2. Disconnect the N68 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) - N68-56 (SPD) Always Below 1 Ω
      N40-19 (+S) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

  21. 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  22. 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here