METER / GAUGE SYSTEM Speed Signal Circuit

DTC Code DTC Name
Speed Signal Circuit

DESCRIPTION

The combination meter assembly receives the vehicle speed signal from this circuit. The wheel speed sensors produce an output that varies according to the vehicle speed. The wheel speed sensor output is received by the skid control ECU which uses this information to create the vehicle speed sensor signal*a. The vehicle speed sensor signal consists of pulses sent to the combination meter assembly from the skid control ECU. To create this signal, 12 V is output from IG2 which is behind a resistor in the combination meter assembly. This voltage is sent to the skid control ECU. The pulse signal is created by switching the transistor in the skid control ECU on and off, making the voltage on the wire drop to 0 V. A similar system is used for the output of this signal from the combination meter assembly via terminal +S. A voltage of 12 V or 5 V is applied to terminal +S from each ECU or relay that is connected to this terminal. The transistor in the combination meter assembly is controlled by the signal from the skid control ECU. When this transistor is turned on, this transistor makes the voltage supplied by the various ECUs (via their respective internal resistors) drop to 0 V. Each ECU connected to terminal +S of the combination meter assembly controls its respective system based on this pulse signal.

  • *a: This vehicle speed sensor signal is created by the skid control ECU. There is no actual component that is referred to as the vehicle speed sensor. In addition, for some systems, vehicle speed information may be received via CAN communication.

Tip:

This circuit is used for the systems connected to terminal +S. This signal is not used for combination meter assembly operation. Combination meter assembly components such as the speedometer operate using data received via CAN communication.

WIRING DIAGRAM

  1. for 1NR-FE

    E267212E01

  2. for 1ZR-FAE

    E267213E01

  3. for 1ND-TV

    E267214E01

  4. for 1AD-FTV

    E267215E01

PROCEDURE

  1. INSPECT ECU TERMINAL VOLTAGE (INPUT VOLTAGE)

    1. E188997C06

      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the E46 combination meter assembly connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      E46-6 (+S) - Body ground

      Ignition switch ON

      4.5 to 14 V
      Tip:

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

    Result

    Proceed to

    OK

    NG
    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)Click here

    OK

  2. INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)

    1. Reconnect the E46 combination meter assembly connector.

    2. C238832C37

      *1

      w/ VSC

      *2

      w/o VSC

      *a

      Front view of wire harness connector

      (to Brake Actuator Assembly (Skid Control ECU))

      Disconnect the A97*1 or A120*2 skid control ECU connector.

      • *1: w/ VSC

      • *2: w/o VSC

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A97*1 or A120*2-2 (SP1) - Body ground

      Ignition switch ON

      11 to 14 V

      • *1: w/ VSC

      • *2: w/o VSC

    Result

    Proceed to

    OK

    NG
    NG

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

    OK

  3. INSPECT SKID CONTROL ECU (INPUT WAVEFORM)

    1. E262405C01

      *a

      Component with harness connected

      (Combination Meter Assembly)

      Check the input waveform.

      1. Reconnect the A97*1 or A120*2 skid control ECU connector.

        • *1: w/ VSC

        • *2: w/o VSC

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

      3. Connect an oscilloscope to terminal E46-5 (SI) and body ground.

      4. Turn the ignition switch to ON.

      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

        Ignition switch ON, wheel being rotated

        OK

        The waveform is similar to that shown in the illustration.

        Tip:

        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

    Proceed to

    OK

    NG
    OK

    REPLACE COMBINATION METER ASSEMBLY

    Click here

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)

    Click here

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

    1. Disconnect the E46 combination meter assembly connector.

    2. Disconnect the A97*1 or A120*2 skid control ECU connector.

      • *1: w/ VSC

      • *2: w/o VSC

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E46-5 (SI) - A97*1 or A120*2-2 (SP1)

      Always

      Below 1 Ω

      E46-5 (SI) - Body ground

      Always

      10 kΩ or higher

      • *1: w/ VSC

      • *2: w/o VSC

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE COMBINATION METER ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    1. Disconnect the 3D instrument panel junction block assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E46-6 (+S) - 3D-38

      Always

      Below 1 Ω

      E46-6 (+S) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    1. Inspect for a short in the wire harness and connectors connected to the instrument panel junction block assembly shown in the wiring diagram.

      Tip:

      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. E262443C01

        *a

        Component without harness connected

        (Instrument Panel Junction Block Assembly)

        Disconnect the 3A and 3D instrument panel junction block assembly connector.

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

        Standard Voltage

        Tester Connection

        Condition

        Specified Condition

        3A-18 - Body ground

        Ignition switch ON

        4.5 to 14 V

        3A-39 - Body ground*

        Ignition switch ON

        4.5 to 14 V

        3D-19 - Body ground

        Ignition switch ON

        4.5 to 14 V

        3D-20 - Body ground

        Ignition switch ON

        4.5 to 14 V

        • *: for Multi-mode manual transaxle

    Result

    Result

    Proceed to

    Voltage is not present in one circuit.

    A

    Voltage is present in all of the circuits.

    B
    B

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    for LHD:Click here

    for RHD:Click here

    A

  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

    3A-18 - Body ground

    SFI system*1 or ECD system*2

    A

    3A-39 - Body ground

    Multi-mode manual transaxle system*3

    B

    3D-19 - Body ground

    Audio and visual system*4 or Navigation system*5

    C

    3D-20 - Body ground

    -

    D

    • *1: for Gasoline

    • *2: for Diesel

    • *3: for Multi-mode manual transaxle

    • *4: w/o Navigation system

    • *5: w/ Navigation system

    B

    CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL ECU ASSEMBLY CIRCUIT)Click here

    C

    CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY CIRCUIT, RADIO AND DISPLAY RECEIVER ASSEMBLY CIRCUIT)Click here

    D

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - JUNCTION CONNECTOR)Click here

    A

  8. CHECK HARNESS AND CONNECTOR (ECM CIRCUIT)

    1. Disconnect the A50*1, A101*2 or A118*3 ECM connector.

      • *1: for 1NR-FE or 1ZR-FAE

      • *2: for 1ND-TV

      • *3: for 1AD-FTV

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A50-44 (SPD)*1 - Body ground

      Always

      10 kΩ or higher

      A101-25 (SPD)*2 - Body ground

      Always

      10 kΩ or higher

      A118-14 (SPD)*3 - Body ground

      Always

      10 kΩ or higher

      • *1: for 1NR-FE or 1ZR-FAE

      • *2: for 1ND-TV

      • *3: for 1AD-FTV

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE ECM

    for 1NR-FE:Click here

    for 1ZR-FAE:Click here

    for 1ND-TV:Click here

    for 1AD-FTV:Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL ECU ASSEMBLY CIRCUIT)

    1. Disconnect the A108 transmission control ECU assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A108-23 (SPD) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE TRANSMISSION CONTROL ECU ASSEMBLY

    for LHD:Click here

    for RHD:Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY CIRCUIT, RADIO AND DISPLAY RECEIVER ASSEMBLY CIRCUIT)

    1. Disconnect the E111 radio receiver assembly*1 or E60 radio and display receiver assembly*2 connector.

      • *1: for Radio receiver type

      • *2: for Radio and display type

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E111-17 (SPD)*1 - Body ground

      Always

      10 kΩ or higher

      E60-17 (SPD)*2 - Body ground

      Always

      10 kΩ or higher

      • *1: for Radio receiver type

      • *2: for Radio and display type

    Result

    Result

    Proceed to

    OK (for Radio receiver type)

    A

    OK (for Radio and display type)

    B

    NG

    C
    A

    REPLACE RADIO RECEIVER ASSEMBLY

    Click here

    B

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - JUNCTION CONNECTOR)

    1. Disconnect the E54 junction connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3D-20 - E54-7

      Always

      Below 1 Ω

      3D-20 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR)

    1. Inspect for a short in the wire harness and connectors connected to the junction connector shown in the wiring diagram.

      Tip:

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

        Standard Voltage

        Tester Connection

        Condition

        Specified Condition

        E54-8 - Body ground

        Ignition switch ON

        4.5 to 14 V

        E54-9 - Body ground

        Ignition switch ON

        4.5 to 14 V

        E54-11 - 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 of the circuits.

    B
    B

    REPLACE JUNCTION CONNECTOR (INTRUMENT PANEL WIRE)

    A

  13. SYSTEM CHECK

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

    Result

    Tester Connection

    System that Uses the Circuit

    Proceed to

    E54-8 - Body ground

    Auto wiper system*1

    A

    E54-9 - Body ground

    Entry and start system*2

    B

    E54-11 - Body ground

    Audio and visual system*3

    C

    • *1: w/ Auto wiper system

    • *2: w/ Entry and start system

    • *3: for 9 speakers

    B

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) CIRCUIT)Click here

    C

    CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY CIRCUIT)Click here

    A

  14. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY CIRCUIT)

    1. Disconnect the E95 windshield wiper relay assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E95-24 (SPD) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE WINDSHIELD WIPER RELAY ASSEMBLY

    for LHD:Click here

    for RHD:Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  15. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) CIRCUIT)

    1. Disconnect the E35 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E35-27 (SPD) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  16. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY CIRCUIT)

    1. Disconnect the E92 stereo component amplifier assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E92-11 (SPD) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR