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Home >> Lexus >> 2008 >> SC 430 >> Repair and Diagnosis >> Electrical >> Gauges >> Meter >> Meter / Gauge System >> Speedometer Malfunction >> Inspection Procedure

Inspection Procedure

  1. PERFORM ACTIVE TEST BY TECHSTREAM (SPEEDOMETER) 
    1. Select the Active Test, use the Techstream to generate a control command, and then check that the speedometer operates.

      Combination meter 

      ACTIVE TEST - COMBINATION METER

      Tester Display Test Part Control Range Diagnostic Note
      Speed Meter Operation Speedometer (mph(km/h)) 0 (0)/25 (40)/50 (80)/75 (120)/99 (160)/124 (200)/150 (240)/175 (280) km/h (mph) Confirm that vehicle is stopped and engine is idling. It is normal that doors will be locked automatically when performing speedometer Active Test. The displayed value has same units (km/h, mph) as main scale of vehicle's speedometer. Needle position should be within acceptable tolerance.

      OK: 

      The speedometer operates normally. 

    NG: REPLACE COMBINATION METER ASSEMBLY 

    OK: Go to next step 

  2. READ VALUE OF TECHSTREAM (SPEEDOMETER) 
    1. Check the Data List for proper functioning of the speedometer.

      Combination meter 

      DATA LIST - COMBINATION METER

      Tester Display Measurement Item / Range 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 on Techstream is almost equal to the actual vehicle speed. 

    NG: GO TO  BRAKE CONTROL 

    OK: Go to next step 

  3. CHECK COMBINATION METER ASSEMBLY 
    1. Disconnect the C8 meter connector.
      Fig 1: Identifying C8 Meter Connector Terminals
      G05292998Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage of the connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      C8-20 (SI) - Body
      • Ignition switch ON ground
      • Shift lever on N position
      • Turn rear wheel slowly
      		 10 to 14 V (pulse generation)

    OK: REPLACE COMBINATION METER ASSEMBLY 

    NG: Go to next step 

  4. CHECK WIRE HARNESS (ECU - METER) 
    1. Disconnect the S6 ECU connector.
    2. Disconnect the C8 meter connector.
      Fig 2: Identifying S6 ECU Connector and C8 Meter Connector Terminals
      G05292999Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      S6-16 (SP1) - C8-20 (SI) Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: REPLACE SKID CONTROL ECU 

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