METER / GAUGE SYSTEM Vehicle Speed Signal Circuit

DESCRIPTION

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

WIRING DIAGRAM

A01FGPQE01
A01FGPQE02

INSPECTION PROCEDURE

Note

Before replacing the certification ECU (smart key ECU assembly), refer to the Service Bulletin.

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 ECM


    1. A01FDEIE01
      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 4B 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 Engine switch on (IG) 4.5 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM) Click here

    OK

  3. CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY


    1. A01FDEIE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the N40 combination meter assembly connector.

    2. Disconnect the A19 ECM connector.

    3. Disconnect the 4B 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 Engine switch on (IG) 4.5 to 14 V

    NG

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

    OK

  4. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. A01FGB8E01
      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 Engine switch on (IG) 4.5 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK RH - CERTIFICATION ECU [SMART KEY ECU ASSEMBLY]) Click here

    OK

  5. CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY


    1. A01FH67E01
      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 Engine 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 A19 ECM 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) - 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. A01FIFJE01

      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. A01FJ1NE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Brake Actuator Assembly [Skid Control ECU])

      Disconnect the A13 brake actuator assembly (skid control ECU) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A13-11 (SP1) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) Click here

    OK

  9. CHECK COMBINATION METER ASSEMBLY


    1. A01FI3QE01
      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 approx. 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 BRAKE ACTUATOR ASSEMBLY Click here

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

  10. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)


    1. Disconnect the N40 combination meter assembly connector.

    2. Disconnect the A19 ECM connector.

    3. Disconnect the N68 multi-media module receiver connector.

    4. Disconnect the 4B 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 - A19-24 (SPD) Always Below 1 Ω
      N40-19 - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (2GR-FSE) A
      OK (4GR-FSE) B
      NG C

    B

    REPLACE ECM Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    REPLACE ECM Click here

  11. 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 A19 ECM connector.

    4. Disconnect the 4B 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 - N68-56 (SPD) Always Below 1 Ω
      N40-19 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

  12. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK RH - CERTIFICATION ECU [SMART KEY ECU ASSEMBLY])


    1. Disconnect the 4B junction block connector.

    2. Disconnect the N93 certification ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4B-5 - N93-27 (SPD) Always Below 1 Ω
      4B-5 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  13. 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

  14. CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY


    1. A01FDEIE01
      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 Engine switch on (IG) 4.5 to 14 V

    NG

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

    OK

  15. CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY


    1. A01FDEIE01
      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 Engine switch on (IG) 4.5 to 14 V

    NG

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

    OK

  16. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. A01FFMPE01
      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 Engine switch on (IG) 4.5 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - CERTIFICATION ECU [SMART KEY ECU ASSEMBLY]) Click here

    OK

  17. CHECK ECM


    1. A01FFMPE01
      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 Engine switch on (IG) 4.5 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - ECM) Click here

    OK

  18. 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

  19. INSPECT COWL SIDE JUNCTION BLOCK LH


    1. A01FI2PE01

      Remove the cowl side junction block LH.

    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
      5B-17 - 5A-58

    NG

    REPLACE COWL SIDE JUNCTION BLOCK LH

    OK

  20. CHECK COMBINATION METER ASSEMBLY


    1. A01FJ1NE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Brake Actuator Assembly [Skid Control ECU])

      Disconnect the A13 brake actuator assembly (skid control ECU) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A13-11 (SP1) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) Click here

    OK

  21. CHECK COMBINATION METER ASSEMBLY


    1. A01FI3QE01
      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 approx. 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 BRAKE ACTUATOR ASSEMBLY Click here

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

  22. 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 - T40-17 (SPD) Always Below 1 Ω
      N40-19 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

  23. 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 - N68-56 (SPD) Always Below 1 Ω
      N40-19 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

  24. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - CERTIFICATION ECU [SMART KEY ECU ASSEMBLY])


    1. Disconnect the 5A junction block connector.

    2. Disconnect the N93 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5A-25 - N93-27 (SPD) Always Below 1 Ω
      5A-25 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  25. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - ECM)


    1. Disconnect the 5A junction block connector.

    2. Disconnect the A19 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5A-58 - A19-24 (SPD) Always Below 1 Ω
      5A-58 - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (2GR-FSE) A
      OK (4GR-FSE) B
      NG C

    B

    REPLACE ECM Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    REPLACE ECM Click here

  26. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)


    1. Disconnect the N40 combination meter assembly connector.

    2. Disconnect the A13 brake actuator assembly (skid control ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N40-20 (SI) - A13-11 (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