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Home › Lexus › 2007 › GS 450h › Repair and Diagnosis › Accessories & Equipment › Cruise Control Systems › Cruise Control › Cruise Control System › DTC P0500 Vehicle Speed Sensor Malfunction › Inspection Procedure

Inspection Procedure

  1. CHECK SPEEDOMETER 
    1. Drive the vehicle and check if the function of the speedometer in the combination meter is normal.

      OK: 

      Actual vehicle speed and the speed indicated on the speedometer are the same. 

      HINT:

      The vehicle speed sensor is functioning normally when the indication on the speedometer is normal.

    NG: GO TO METER / GAUGE SYSTEM (SPEEDOMETER MALFUNCTION)  (See SPEEDOMETER MALFUNCTION )

    OK: GO TO Next Step 

  2. READ VALUE OF INTELLIGENT TESTER (VEHICLE SPEED SIGNAL) 
    1. Check the DATA LIST for proper functioning of the vehicle speed signal.

      Hybrid vehicle control ECU 

      ITEM MEASUREMENT CONDITIONS

      Item Measurement Item / Display (Range) Normal Condition
      CCS VEHICLE SPD vehicle speed / min.: 0 km/h (0 mph), max.: 255 km/h (158 mph) Actual stored vehicle speed

      OK: 

      The speed displayed on the tester screen is almost the same as the speed indicated on the combination meter. 

    OK: REPLACE HYBRID VEHICLE CONTROL ECU 

    NG: GO TO Next Step 

  3. CHECK COMBINATION METER (SPDI SIGNAL) 
    1. Disconnect the A54 ECU connector.
    2. Turn the power switch ON (IG).
    3. Move the shift lever to N.
    4. Jack up the vehicle.
    5. Measure the voltage of the connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      A54-54 (SPDI) - Body ground Waveform appears

      HINT:

      The output voltage fluctuates up and down as shown in the diagram when the rear wheel is turned slowly.

      Fig 1: Identifying A54 ECU Connector Terminals
      G05306684Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE HYBRID VEHICLE CONTROL ECU 

    NG: GO TO Next Step 

  4. CHECK WIRE HARNESS (HYBRID VEHICLE CONTROL ECU - COMBINATION METER) 
    1. Disconnect the A54 ECU connector.
    2. Disconnect the K31 meter connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      A54-54 (SPDI) - K31-9 (+S) Below 1 Ω
      Fig 2: Identifying A54 ECU And K31 Meter Connector Terminals
      G05306685Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE COMBINATION METER ASSEMBLY 

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