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Inspection Procedure

  1. READ VALUE OF INTELLIGENT TESTER 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the intelligent tester main switch on.
    4. Select the "DATA LIST" on the Intelligent tester, and read the displays on the intelligent tester.

      DATA LIST: AFS (AFS ECU) 

      DATA LIST

      Item Measurement Item / Display (Range) Normal Condition Diagnostic Note
      FR HEIGHT SENS Front height sensor signal value / 0 to 5V Approx. 2.5 V -
      RR HEIGHT SENS Rear height sensor signal value / 0 to 5V Approx. 2.5 V -

      OK: Condition sign can be displayed. 

      Result 

      RESULT CHART

      Result Proceed to
      OK (When checking from PROBLEM SYMPTOMS TABLE) A
      OK (When checking from DIAGNOSTIC TROUBLE CODE CHART) B
      NG C

    B: REPLACE AFS ECU 

    C: Go to step 2 

    A: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

  2. CHECK HARNESS AND CONNECTOR (FRONT HEIGHT CONTROL SENSOR CIRCUIT) 
    1. Disconnect the A17 front height control sensor connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A17-1 (SHG) - A17-3 (SHB) Engine switch on (IG) 4.5 to 5.5 V
      Fig 1: Identifying A17 Front Height Control Sensor Connector Terminals
      G05320298Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  8

    OK: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (REAR HEIGHT CONTROL SENSOR CIRCUIT) 
    1. Disconnect the Y2 rear height control sensor connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      Y2-1 (SHG) - Y2-3 (SHB) Engine switch on (IG) 4.5 to 5.5 V
      Fig 2: Identifying Y2 Rear Height Control Sensor Connector Terminals
      G05320299Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  9

    OK: Go to Next Step 

  4. CHECK HARNESS AND CONNECTOR (AFS ECU - FRONT HEIGHT CONTROL SENSOR) 
    1. Disconnect the A28 AFS ECU connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A28-2 (SHFL) - A17-2 (SHFL) Always Below 1 Ω
      A28-2 (SHFL) - Body ground Always 10 kΩ or higher
      Fig 3: Identifying A28 AFS ECU Connector Terminals
      G05320300Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  5. CHECK HARNESS AND CONNECTOR (AFS ECU - REAR HEIGHT CONTROL SENSOR) 
    1. Disconnect the Y2 sensor connector.
    2. Disconnect the A27 AFS ECU connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A27-9 (SHRL) - Y2-2 (SHRL) Always Below 1 Ω
      A27-9 (SHRL) -Body ground Always 10 kΩ or higher
      Fig 4: Identifying A27 AFS ECU Connector Terminals
      G05320301Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  6. INSPECT HEIGHT CONTROL SENSOR (FRONT HEIGHT CONTROL SENSOR) 
    1. Connect 3 dry cell batteries (1.5 V) in series.
    2. Remove the height control sensor assembly front.
    3. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead from the battery to terminal 1.
    4. Measure the voltage between terminals 2 and 1 while slowly moving the link up and down.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A17-2 (SHFL) - A17-1 (SHG) +45° Approx. 4.5 V
      A17-2 (SHFL) - A17-1 (SHG) 0° (Normal) Approx. 2.5 V
      A17-2 (SHFL) - A17-1 (SHG) -45° (Low) Approx. 0.5 V
      Fig 5: Identifying Voltage Between Terminals 2 And 1
      G05320302Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE HEIGHT CONTROL SENSOR (FRONT HEIGHT CONTROL SENSOR) 

    OK: Go to Next Step 

  7. INSPECT HEIGHT CONTROL SENSOR (REAR HEIGHT CONTROL SENSOR) 
    1. Connect 3 dry cell batteries (1.5 V) in series.
    2. Remove the height control sensor assembly rear.
    3. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead from the battery to terminal 1.
    4. Measure the voltage between terminals 2 and 1 while slowly moving the link up and down.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      Y2-2 (SHRL) - Y2-1 (SHG) +45° Approx. 4.5 V
      Y2-2 (SHRL) - Y2-1 (SHG) 0° (Normal) Approx. 2.5 V
      Y2-2 (SHRL) - Y2-1 (SHG) -45° (Low) Approx. 0.5 V
      Fig 6: Identifying Rear Height Control Sensor Angle
      G05298801Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE HEIGHT CONTROL SENSOR (REAR HEIGHT CONTROL SENSOR) 

    OK: REPLACE AFS ECU 

  8. CHECK HARNESS AND CONNECTOR (AFS ECU - FRONT HEIGHT CONTROL SENSOR) 
    1. Disconnect the A17 front height control sensor connector.
    2. Disconnect the A28 AFS ECU connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A28-1 (SBF) - A17-3 (SHB) Always Below 1 Ω
      A28-2 (SHFL) - A17-2 (SHFL) Always Below 1 Ω
      A28-17 (SGF) - A17-1 (SHG) Always Below 1 Ω
      A28-1 (SBF) - Body ground Always 10 kΩ or higher
      A28-2 (SHFL) - Body ground Always 10 kΩ or higher
      A28-17 (SGF) - Body ground Always 10 kΩ or higher
      Fig 7: Identifying A17 Front Height Control Sensor Connector Terminals
      G05320304Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (AFS ECU - FRONT HEIGHT CONTROL SENSOR) 

    OK: REPLACE AFS ECU 

  9. CHECK HARNESS AND CONNECTOR (AFS ECU - REAR HEIGHT CONTROL SENSOR) 
    1. Disconnect the Y2 sensor connector.
    2. Disconnect the A27 AFS ECU connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A27-10 (SBR) - Y2-3 (SHB) Always Below 1 Ω
      A27-9 (SHRL) - Y2-2 (SHFL) Always Below 1 Ω
      A27-20 (SGR) - Y2-1 (SHRL) Always Below 1 Ω
      A27-10 (SBR) - Body ground Always 10 kΩ or higher
      A27-9 (SHRL) - Body ground Always 10 kΩ or higher
      A27-20 (SGR) - Body ground Always 10 kΩ or higher
      Fig 8: Identifying Y2 Sensor Connector Terminals
      G05320305Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (AFS ECU - REAR HEIGHT CONTROL SENSOR) 

    OK: REPLACE AFS ECU 

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