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Home >> Lexus >> 2005 >> SC 430 >> Repair and Diagnosis >> Electrical >> Gauges >> Combination Meter - Diagnostics >> Malfunction In Speedometer >> Inspection Procedure

Inspection Procedure

  1. PERFORM ACTIVE TEST (SPEEDOMETER) 
    1. Select the ACTIVE TEST, use the hand-held tester to generate a control command, and then check that the speedometer operates.

      Combination meter assy: 

      SPEEDOMETER

      Item Test Details Diagnostic Note
      SPEED METER 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 meter operates normally. 

    1. NG: REPLACE COMBINATION METER ASSY (See  COMBINATION METER ASSY  ) 
    2. OK: Go to next step. 
  2. READ DATA LIST (SPEEDOMETER) 
    1. Check the DATA LIST for proper functioning of the speedometer.

      Combination meter assy: 

      Fig 1: Speedometer Data List
      G02956779Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Vehicle speed on tester is almost equal to the actual vehicle speed. 

    1. NG: Go to step   3 
    2. OK: REPLACE COMBINATION METER ASSY (See  COMBINATION METER ASSY  ) 
  3. CHECK COMBINATION METER ASSY 
    1. Remove the combination meter, but do not disconnect the connectors.
    2. Measure the voltage of the meter.

      Standard: 

      Fig 2: Combination Meter Assy Table
      G02956780Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 3: Checking Combination Meter Assy
      G02956781Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: Go to step   4 
    2. OK: REPLACE COMBINATION METER ASSY (See  COMBINATION METER ASSY  ) 
  4. CHECK WIRE HARNESS (SKID CONTROL ECU WITH ACTUATOR - COMBINATION METER ASSY) 
    1. Disconnect the S6 ECU connector.
    2. Disconnect the C8 meter connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard: 

      SKID CONTROL ECU WITH ACTUATOR - COMBINATION METER ASSY

      Tester Connection Specified Condition
      S6-16 (SP1) - C8-18 (S1) Below 1 ohms
      Fig 4: Checking Wire Harness (Skid Control ECU With Actuator - Combination Meter Assy)
      G02956782Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: Go to  ABS WITH EBD & BA & TRAC & VSC SYSTEM - DIAGNOSTICS 
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