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Inspection Procedure

  1. CLEAR DTC 
    1. Clear the DTC (see DTC CHECK / CLEAR  ).
  2. CHECK DTC 
    1. Check for DTC (see DTC CHECK / CLEAR  ).

      OK : 

      DTC B2416 output does not occur. 

    NG: Go to step 3 

    OK: NORMAL 

  3. CHECK VEHICLE SYSTEM 
    1. Check vehicle system.

      Result: 

      RESULT CHART

      Result Proceed to
      w/ Coil Suspension A
      w/ Air Suspension B

    B: Go to step   10 

    A: GO TO NEXT STEP 

  4. READ VALUE OF INTELLIGENT TESTER OR TECHSTREAM (HEIGHT CONTROL SENSOR) 
    1. Using the intelligent tester or Techstream, read the Data List.
      1. Intelligent tester

        AFS 

        INTELLIGENT TESTER - AFS

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        RR HEIGHT SENS Rear height control sensor signal/ Min.:0V, Max.:5V Height control sensor vehicle height value -
        HEIGHT SENSE VOL Height control sensor power supply value/Mm.: 0 V, Max.: 5 V Power supply voltage to height control sensor -
      2. Techstream

        AFS 

        TECHSTREAM - AFS

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        Rr Height Sens Signal Val Rear height control sensor signal/ Min.: 0 V, Max.:5V Height control sensor vehicle height value -
        Height Sens Pw Supply Val Height control sensor power supply value/Min.: 0 V, Max.: 5 V Power supply voltage to height control sensor -

        OK : 

        Normal conditions listed above are displayed. 

    NG: Go to step 5 

    OK: REPLACE AFS ECU (See  REMOVAL   ) 

  5. CHECK HARNESS AND CONNECTOR (AFS ECU - HEIGHT CONTROL SENSOR) 
    1. Disconnect the A37 ECU connector.
    2. Disconnect the S65 and A4 sensor connectors.
    3. Measure the resistance according to the value(s) in the table below.
      Fig 1: Checking Harness And Connector (AFS ECU - Height Control Sensor)
      G04944650Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      AFS ECU - HEIGHT CONTROL SENSOR

      Tester Connection Condition Specified Condition
      A37-18 (SBR) - S65-3 (SHB) Always Below 1 Ω
      A37-19 (SHRL) - S65-2 (SHRL) Always Below 1 Ω
      A37-21 (SGR) - S65-1 (SHG) Always Below 1 Ω
      A37-18 (SBR) - Body ground Always 10 kΩ or higher
      A37-19 (SHRL) - Body ground Always 10 kΩ or higher
      A37-21 (SGR) - Body ground Always 10 kΩ or higher
      A37-17 (SHFL)-A4-2 (SHFL) Always Below 1 Ω
      A37-18 (SBR)-A4-3 (SHB) Always Below 1 Ω
      A37-21 (SGR) - A4-1 (SHG) Always Below 1 Ω
      A37-17 (SHFL) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  6. CHECK AFS ECU (SBR - SGR VOLTAGE) 
    1. Reconnect the A37 ECU connector.
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.
      Fig 2: Checking AFS ECU (SBR - SGR Voltage)
      G04944651Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      AFS ECU (SBR - SGR VOLTAGE)

      Tester Connection Switch Condition Specified Condition
      A37-18 (SBR) - A37-21 (SGR) Engine switch on (IG) 4.5 to 5.5 V

    NG: REPLACE AFS ECU (See  REMOVAL   ) 

    OK: GO TO NEXT STEP 

  7. INSPECT FRONT HEIGHT CONTROL SENSOR SUB-ASSEMBLY 
    1. Connect 3 dry cell batteries (1.5 V) in series.
    2. Connect the positive (+) lead from the batteries to terminal 3, and the negative (-) lead from the batteries to terminal 1.
    3. Measure the voltage between terminals 2 and 1 while slowly moving the link up and down.
      Fig 3: Inspecting Front Height Control Sensor Sub-Assembly
      G04944652Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      FRONT HEIGHT CONTROL SENSOR SUB-ASSEMBLY

      Tester Connection Condition Specified Condition
      2 (SHFL) -1 (SHG) +45° (High) 4.05 V
      +45° (Normal) 2.25 V
      -45° (Low) 0.45 V

    NG: REPLACE FRONT HEIGHT CONTROL SENSOR SUB-ASSEMBLY (See  REMOVAL   ) 

    OK: GO TO NEXT STEP 

  8. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY 
    1. Connect 3 dry cell batteries (1.5 V) in series.
    2. Connect the positive (+) lead from the batteries to terminal 3, and the negative (-) lead from the batteries to terminal 1.
    3. Measure the voltage between terminals 2 and 1 while slowly moving the link up and down.
      Fig 4: Inspecting Rear Height Control Sensor Sub-Assembly
      G04944653Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY

      Tester Connection Condition Specified Condition
      2 (SHRL) -1 (SHG) +45° (High) 4.05 V
      0° (Normal) 2.25 V
      -45° (Low) 0.45 V

    NG: REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY (See  REMOVAL   ) 

    OK: GO TO NEXT STEP 

  9. INSPECT REAR HEIGHT CONTROL SENSOR LH WIRE 
    1. Disconnect the S65 and A wire connectors.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 5: Inspecting Rear Height Control Sensor LH Wire
      G04944654Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      REAR HEIGHT CONTROL SENSOR LH WIRE

      Tester Connection Condition Specified Condition
      A-1 - S65-1 (SHG) Always Below 1 Ω
      A-2 - S65-2 (SHRL) Always Below 1 Ω
      A-3 - S65-3 (SHB) Always Below 1 Ω
      A-1 - Body ground Always 10 kΩ or higher
      A-2 - Body ground Always 10 kΩ or higher
      A-3 - Body ground Always 10 kΩ or higher

    NG: REPLACE REAR HEIGHT CONTROL SENSOR LH WIRE 

    OK: REPLACE AFS ECU (See  REMOVAL   ) 

  10. CHECK DTC (AIR SUSPENSION SYSTEM) 
    1. Check for DTC (see DTC CHECK / CLEAR ).

      Result 

      DTC (AIR SUSPENSION SYSTEM)

      Result Proceed to
      DTC "C1712/12 Front Height Control Sensor LH Circuit Malfunction" and "C1714/14 Rear Height Control Sensor LH Circuit Malfunction" output do not occur A
      DTC "C1712/12 Front Height Control Sensor LH Circuit Malfunction" or "C1714/14 Rear Height Control Sensor LH Circuit Malfunction" output occurs B

    B: GO TO AIR SUSPENSION SYSTEM  (See DIAGNOSTIC TROUBLE CODE CHART )

    A: GO TO NEXT STEP 

  11. READ VALUE OF INTELLIGENT TESTER OR TECHSTREAM (AFS ECU) 
    1. Using the intelligent tester or Techstream, read the Data List.
      1. Intelligent tester

        AFS 

        INTELLIGENT TESTER - AFS

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        HEIGHT SENS VOL Height control sensor power supply value/Min.: 0 V, Max.: 5 V Power supply voltage to height control sensor -
        FR HEIGHT SENS Front height control sensor signal/Min.: 0V, Max.: 5 V Height control sensor vehicle height value -
        RR HEIGHT SENS Rear height control sensor signal/ Min.: 0V, Max.: 5 V Height control sensor vehicle height value -
      2. Techstream

        AFS 

        TECHSTREAM - AFS

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        Height Sens Pw Supply Val Height control sensor power supply value/Min.: 0 V, Max.: 5 V Power supply voltage to height control sensor -
        Fr Height Sens Signal Val Front height control sensor signal/Min.: 0 V, Max.: 5 V Height control sensor vehicle height value -
        Rr Height Sens Signal Val Rear height control sensor signal/ Min.:0V, Max.:5V Height control sensor vehicle height value -

    NG: Go to step 12 

    OK: REPLACE AFS ECU (See  REMOVAL   ) 

  12. CHECK SUSPENSION CONTROL ECU 
    1. Measure the voltage according to the value(s) in the table below.
      Fig 6: Checking Suspension Control ECU
      G04944655Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      SUSPENSION CONTROL ECU VOLTAGE

      Tester Connection Switch Condition Specified Condition
      A39-23 (SBL3) - A39-24 (SGL3) Engine switch on (IG) Approx. 5 V
      A39-21 (SHF2) - A39-24 (SGL3) While engine is running, height control switch is changed from HIGH to NORM, and vehicle height adjustment is finished Approx. 2.5 V
      A39-19 (SHR2)-A39-24 (SGL3) While engine is running, height control switch is changed from HIGH to NORM, and vehicle height adjustment is finished Approx. 2.5 V
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      SUSPENSION CONTROL ECU RESISTANCE

      Tester Connection Condition Specified Condition
      A39-24 (SGL3) - Body ground Always Below 1 Ω

    NG: REPLACE SUSPENSION CONTROL ECU  (See REMOVAL )

    OK: GO TO NEXT STEP 

  13. CHECK HARNESS AND CONNECTOR (AFS ECU - SUSPENSION CONTROL ECU) 
    1. Disconnect the A37 and A39 ECU connectors.
      Fig 7: Checking Harness And Connector (AFS ECU - Suspension Control ECU)
      G04944656Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      AFS ECU - SUSPENSION CONTROL ECU

      Tester Connection Condition Specified Condition
      A37-17 (SHFL)-A39-21 (SHF2) Always Below 1 Ω
      A37-18 (SBR)-A39-23 (SBL3) Always Below 1 Ω
      A37-19 (SHRL)-A39-19 (SHR2) Always Below 1 Ω
      A37-21 (SGR) - A39-24 (SGL3) Always Below 1 Ω
      A37-17 (SHFL) - Body ground Always 10 kΩ or higher
      A37-18 (SBR) -Body ground Always 10 kΩ or higher
      A37-19 (SHRL) - Body ground Always 10 kΩ or higher
      A37-21 (SGR) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE AFS ECU (See  REMOVAL   ) 

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