METER / GAUGE SYSTEM 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 assembly which uses this information to create the vehicle speed signal*a. The vehicle speed signal consists of pulses sent to the combination meter assembly from the skid control ECU assembly. 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 assembly. The pulse signal is created by switching the transistor in the skid control ECU assembly 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 assembly. 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.


Tech Tips

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

B001CD8E01
B001I4TE01

CAUTION / NOTICE / HINT

Note


  • Before replacing the ECM or certification ECU (smart key ECU assembly) refer to Service Bulletin.

  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

PROCEDURE


  1. INSPECT ECU TERMINAL VOLTAGE (INPUT VOLTAGE)


    1. B001HQ6C60
      *A

      Front view of wire harness connector

      (to Combination Meter Assembly)
      *1 except 5L-E
      *2 for 5L-E

      Disconnect the combination meter assembly connector.

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

      Standard Voltage (except 5L-E)
      Tester Connection Switch Condition Specified Condition
      G304-17 (+S) - Body ground Engine switch on (IG) 4.5 to 14 V
      Standard Voltage (for 5L-E)
      Tester Connection Switch Condition Specified Condition
      G6-32 (+S) - Body ground Engine switch on (IG) 4.5 to 14 V

      Tech Tips

      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 - EACH ECU) Click here

    OK

  2. INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)


    1. for 1GR-FE, 1KD-FTV, 1GD-FTV:


      1. Reconnect the G304 combination meter assembly connector.

      2. B001EXBC02
        *a

        Front view of wire harness connector

        (to Skid Control ECU Assembly)

        Disconnect the skid control ECU assembly connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        A7-12 (SP1) - Body ground Engine switch on (IG) 11 to 14 V

    2. for 2TR-FE, 5L-E:


      1. Reconnect the G304*1, G6*2 combination meter assembly connector.


        • *1: for 2TR-FE

        • *2: for 5L-E

      2. B001CVEC02
        *a

        Front view of wire harness connector

        (to Skid Control ECU Assembly)

        Disconnect the skid control ECU assembly connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        A6-11 (SP1) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  3. INSPECT COMBINATION METER ASSEMBLY (INPUT WAVEFORM)


    1. B001F6IC90
      *A

      Component with harness connected

      (Combination Meter Assembly)
      *1 except 5L-E
      *2 5L-E

      Check the input waveform.


      1. Reconnect the A7*1, A6*2 skid control ECU assembly connector.


        • *1:1GR-FE, 1KD-FTV, 1GD-FTV

        • *2: 2TR-FE, 5L-E

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

      3. Connect an oscilloscope to terminal G304-18 (SI)*1, G6-33 (SI)*2 and body ground.


        • *1: except 5L-E

        • *2: fpr 5L-E

      4. Turn the engine 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 Engine switch on (IG) wheel being rotated
        OK
        The waveform is similar to that 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.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPLACE SKID CONTROL ECU ASSEMBLY Click here

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


    1. Disconnect the G304*1 or G6*2 combination meter assembly connector.

    2. Disconnect the A6*1 or A7*2 skid control ECU assembly connector.

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

      Standard Resistance (except 5L-E)
      Tester Connection Condition Specified Condition
      G304-18 (SI) - A6-11 (SP1)*1 Always Below 1 Ω
      G304-18 (SI) - A7-17 (SP1)*2 Always Below 1 Ω
      G304-18 (SI) - Other terminals and body ground Always 10 kΩ or higher
      Standard Resistance (for 5L-E)
      Tester Connection Condition Specified Condition
      G6-33 (SI) - A9-22 (SP1) Always Below 1 Ω
      G304-18 (SI) - Other terminals and body ground Always 10 kΩ or higher
      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 - EACH ECU)


    1. Disconnect the G215*1 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the H63*2 stereo component amplifier assembly connector.

    3. Disconnect the G55*3, G56*4, G58*5, G181*6, G182*7 or G184*8 ECM connector.

    4. Disconnect the H56 navigation receiver assembly connector.*9

    5. Disconnect the H51 radio and display receiver assembly connector.*10

    6. Disconnect the H47 radio receiver assembly connector.*11

    7. Disconnect the G70 TCM connector.*12

    8. Disconnect the G210 auto wiper switch connector.*13

    9. Disconnect the G187 teiematics transceiver connector.*14

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

      Standard Resistance (except 5L-E)
      Tester Connection Condition Specified Condition
      G304-17 (+S) - Other terminals and body ground Always 10 kΩ or higher
      Standard Resistance (for 5L-E)
      Tester Connection Condition Specified Condition
      G6-32 (+S) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

      • *1: w/ Entry and Start System

      • *2: w/ Stereo Component Amplifier

      • *3: for 1GR-FE, Automatic Transmission

      • *4: for 1GR-FE, Manual Transmission

      • *5: for 1KD-FTV

      • *6: for 2TR-FE

      • *7: for 5L-E

      • *8: for 1GD-FTV

      • *9: w/ Navigation System

      • *10: w/ Audio and Visual System (for Radio and Display Type)

      • *11: w/ Audio and Visual System (for Radio Receiver Type)

      • *12: for 1KD-FTV, Automatic Transmission

      • *13: w/ Auto Wipre System

      • *14: w/ Telematics System


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT ECM (SHORT CIRCUIT IN ECM)


    • *1: w/ Entry and Start System

    • *2: w/ Stereo Component Amplifier

    • *3: w/ Navigation System

    • *4: w/ Audio and Visual System (for Radio and Display Type)

    • *5: w/ Audio and Visual System (for Radio Receiver Type)

    • *6: for 1KD-FTV, Automatic Transmission

    • *7: w/ Auto Wipre System

    • *8: w/ Telematics System


    1. Reconnect the G215*1 certification ECU (smart key ECU assembly) connector.

    2. Reconnect the H63*2 stereo component amplifier assembly connector.

    3. Reconnect the H56 navigation receiver assembly connector.*3

    4. Reconnect the H51 radio and display receiver assembly connector.*4

    5. Reconnect the H47 radio receiver assembly connector.*5

    6. Reconnect the G70 TCM connector.*6

    7. Reconnect the G210 auto wiper switch connector.*7

    8. Reconnect the G187 telematics transceiver connector.*8

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

      Standard Voltage (except 5L-E)
      Tester Connection Switch Condition Specified Condition
      G304-17 (+S) - Body ground Engine switch on (IG) 4.5 to 14 V
      Standard Voltage (for 5L-E)
      Tester Connection Switch Condition Specified Condition
      G6-32 (+S) - Body ground Engine switch on (IG) 4.5 to 14 V

      Tech Tips

      If the result is as specified, there may be a short circuit in the ECM.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM for 1GR-FE Click here for 1KD-FTV Click here for 2TR-FE Click here for 1GD-FTV Click here for 5L-E Click here

    NG

  7. INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY (SHORT CIRCUIT IN STEREO COMPONENT AMPLIFIER)

    Note

    For vehicle without a stereo component amplifier assembly, proceed to next step.


    1. Disconnect the H63 stereo component amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G304-17 (+S) - Body ground Engine switch on (IG) 4.5 to 14 V

      Tech Tips

      If the result is as specified, there may be a short circuit in the stereo component amplifier assembly.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

    NG

  8. INSPECT TELEMATICS TRANSCEIVER (SHORT CIRCUIT IN TELEMATICS TRANSCEIVER)

    Note

    For vehicle without a telephone transceiver assembly, proceed to next step.


    1. Disconnect the G187 telematics transceiver connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G304-17 (+S) - Body ground Engine switch on (IG) 4.5 to 14 V

      Tech Tips

      If the result is as specified, there may be a short circuit in the telephone transceiver assembly.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TELEPHONE TRANSCEIVER ASSEMBLY Click here

    NG

  9. INSPECT CERTIFICATION ECU (SHORT CIRCUIT IN CERTIFICATION ECU)

    Note

    For vehicle without a certification ECU, proceed to next step.


    1. Disconnect the G215 certification ECU connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G304-17 (+S) - Body ground Engine switch on (IG) 4.5 to 14 V

      Tech Tips

      If the result is as specified, there may be a short circuit in the certification ECU (smart key ECU assembly).

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

  10. INSPECT TRANSMISSION CONTROL ECU ASSEMBLY (SHORT CIRCUIT IN TCM)

    Note

    For vehicle without a TCM, proceed to next step.


    1. Disconnect the G70 TCM connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G304-17 (+S) - Body ground Engine switch on (IG) 4.5 to 14 V

      Tech Tips

      If the result is as specified, there may be a short circuit in the TCM.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TCM Click here

    NG

  11. INSPECT WINDSHIELD WIPER RELAY ASSEMBLY (SHORT CIRCUIT IN WINDSHIELD WIPER RELAY ASSEMBLY)

    Note

    For vehicle without a windshield wiper relay assembly, proceed to next step.


    1. Disconnect the G210 windshield wiper relay assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G304-17 (+S) - Body ground Engine switch on (IG) 4.5 to 14 V

      Tech Tips

      If the result is as specified, there may be a short circuit in the windshield wiper relay assembly.

      Result
      Result Proceed to
      OK A
      NG (w/ Navigation System) B
      NG (Audio and Visual System [for Radio and Display Type]) C
      NG (w/ Audio and Visual System [for Radio Receiver Type]) D

    A

    REPLACE WINDSHIELD WIPER RELAY ASSEMBLY Click here

    B

    REPLACE NAVIGATION RECEIVER ASSEMBLY Click here

    C

    REPLACE REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    D

    REPLACE RADIO RECEIVER ASSEMBLY Click here