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Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC (VEHICLE STABILITY CONTROL SYSTEM) 
    1. Check that vehicle stability control system DTCs are not output.

      Result 

      RESULT REFERENCE

      Result Proceed to
      VSC system DTC is not output A
      VSC system DTC is output B

    B: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS  (See DIAGNOSTIC TROUBLE CODE CHART )

    A: Go to next Step 

  2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - AFS ECU) 
    1. Disconnect the A28 AFS ECU connector.
    2. Disconnect the A35 skid control ECU connector.
    3. Measure the resistance according to the value (s) in the table below

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      A35-5 (FRO) - A28-7 (SPDR) Always Below 1 Ω
      A35-4 (FLO) - A28-6 (SPDL) Always Below 1 Ω
      A28-7 (SPDR) - Body ground Always 10 kΩ or higher
      A28-6 (SPDL) - Body ground Always 10 kΩ or higher
      4. Fig 1: Identifying A28 AFS ECU Connector And A35 Skid Control ECU Connector
      G05756402Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next Step 

  3. CHECK AFS ECU 
    1. Disconnect the A28 AFS ECU connector
    2. Measure the voltage according to the value (s) in the table below

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      A28-6 (SPDL) - Body ground Vehicle is driving at approx. 30 km/h (19 mph) 0 to 5 V Pulse generation (see  1waveform 1)
      A28-7 (SPDR) - Body ground Vehicle is driving at approx. 30 km/h (19 mph) 0 to 5 V Pulse generation (see  1waveform 1)
      Fig 2: Identifying A28 AFS ECU Connector Terminal
      G05756403Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Waveform 1: Oscilloscope wave
        WAVEFORM REFERENCE

        Item Contents
        Tool setting 2 V/DIV, 2 ms /DIV
        Vehicle condition Vehicle is driving at approximately 30 km/h (19 mph)

        OK: Waveform is output as shown in the illustration. 

        Fig 3: Identifying Oscilloscope Waveform
        G05298794Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Result 

        RESULT REFERENCE

        Result Proceed to
        OK (When checking from Diagnostic Trouble Code Chart) A
        OK (When checking from Problem Symptoms Table) B
        NG C

    B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE  (See PROBLEM SYMPTOMS TABLE  )

    C: REPLACE SKID CONTROL ECU ASSEMBLY  (See SKID CONTROL ECU )

    A: REPLACE AFS ECU  (See AFS ECU  )

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