METER / GAUGE SYSTEM > Malfunction in Speedometer

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WIRING DIAGRAM


E110303E01


INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER

  1. Operate the intelligent tester according to the display and select the "Active Test".

    Combination meter:

    Item
    		Test Details
    		Diagnostic Note
    Speed Meter Operation
    		0 / 40 (24) / 80 (48) / 120 (72) / 160 (96) / 200 (120) / 240 (149) km/h (mph)
    		-

    OK:
    Needle indication is normal.



NG
REPLACE COMBINATION METER
OK


2.READ VALUE OF INTELLIGENT TESTER

  1. Operate the intelligent tester according to the display and select the "Data List".

    Combination meter:

    Item
    		Measurement Item / Range (Display)
    		Normal Condition
    		Diagnostic Note
    Vehicle Speed Meter
    		Vehicle speed / Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph)
    		Almost same as actual vehicle speed (When driving)
    		-

    OK:
    Vehicle speed displayed on the tester is almost the same as the actual vehicle speed.



NG
Go to step 3
OK

REPLACE COMBINATION METER 

3.READ VALUE OF INTELLIGENT TESTER

  1. Operate the intelligent tester according to the display and select the "Data List".

    Skid control ECU:

    Item
    		Measurement Item / Range (Display)
    		Normal Condition
    		Diagnostic Note
    FR WHEEL SPD
    		Wheel speed sensor (FR) reading/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)
    		Almost same as actual vehicle speed (When driving)
    		-
    FL WHEEL SPD
    		Wheel speed sensor (FL) reading/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)
    		Almost same as actual vehicle speed (When driving)
    		-
    RR WHEEL SPD
    		Wheel speed sensor (RR) reading/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)
    		Almost same as actual vehicle speed (When driving)
    		-
    RL WHEEL SPD
    		Wheel speed sensor (RL) reading/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)
    		Almost same as actual vehicle speed (When driving)
    		-

    OK:
    Vehicle speed displayed on the tester is almost the same as the actual vehicle speed.



NG
GO TO BRAKE CONTROL
OK


4.INSPECT COMBINATION METER


    E107973E05

  1. Check the input signal waveform.

    1. Remove the combination meter with the connector still connected.

    2. Connect the oscilloscope to the terminals L31-29 and body ground.

    3. Start the engine.



      4. E107975E02

    4. Check the signal waveform of the connector.
      Item
      		Condition
      Tool Setting
      		5 V/DIV, 20 msec/DIV.
      Vehicle Condition
      		Driving at approx. 20 km/h (12 mph)

      OK:
      As shown in the illustration

      HINT:
      As vehicle speed increases, the cycle of the signal waveform narrows.



NG
Go to step 5
OK

REPLACE COMBINATION METER 

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


    E110478E01

  1. 3UZ-FE:

    1. Disconnect the L31 meter connector.

    2. Disconnect the A13 meter connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance:
      Tester Connection
      		Condition
      		Specified Condition
      L31-29 - A13-7
      		Always
      		Below 1 Ω
      L31-29 - Body ground
      		Always
      		10 kΩ or higher



    E110478E02

  1. 3GR-FE, 3GR-FSE:

    1. Disconnect the L31 meter connector.

    2. Disconnect the A48 meter connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance:
      Tester Connection
      		Condition
      		Specified Condition
      L31-29 - A48-12
      		Always
      		Below 1 Ω
      L31-29 - Body ground
      		Always
      		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


6.INSPECT SKID CONTROL ECU


  1. 3UZ-FE:



      E108711E05

    1. Disconnect the A13 ECU connector.

    2. Measure the voltage of the wire harness side connector.

      Standard voltage:
      Tester Connection
      		Condition
      		Specified Condition
      A13-7 - Body ground
      		Engine switch on (IG)
      		10 to 14 V



  1. 3GR-FE, 3GR-FSE:



      E108711E07

    1. Disconnect the A48 ECU connector.

    2. Measure the voltage of the wire harness side connector.

      Standard Voltage:
      Tester Connection
      		Condition
      		Specified Condition
      A48-12 - Body ground
      		Engine switch on (IG)
      		10 to 14 V



NG
REPLACE COMBINATION METER
OK

GO TO BRAKE CONTROL