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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 USING TECHSTREAM (HEIGHT CONTROL SENSOR) 
    1. Using the Techstream, read the Data List.

      AFS 

      AFS DATA LIST

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Rr Height Sens Signal Val Rear height control sensor signal/Min.: 0 V, Max.: 5 V 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.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITIONS

      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
      Fig 1: Identifying A37 ECU With S65 And A4 Sensor Connector Terminals
      G04944650Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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.

      Standard voltage 

      VOLTAGE SPECIFIED CONDITIONS

      Tester Connection Switch Condition Specified Condition
      A37-18 (SBR) - A37-21 (SGR) Engine switch on (IG) 4.5 to 5.5 V
      Fig 2: Identifying A37 ECU Connector Terminals
      G04944651Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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.

      Standard voltage 

      VOLTAGE SPECIFIED CONDITIONS

      Tester Connection Condition Specified Condition
      2 (SHFL) -1 (SHG) +45° (High) 4.05 V
      +45° (Normal) 2.25 V
      -45° (Low) 0.45 V
      Fig 3: Inspecting Front Height Control Sensor Sub-Assembly
      G04944652Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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.

      Standard voltage 

      VOLTAGE SPECIFIED CONDITIONS

      Tester Connection Condition Specified Condition
      2 (SHRL) - 1 (SHG) +45° (High) 4.05 V
      0° (Normal) 2.25 V
      -45° (Low) 0.45 V
      Fig 4: Inspecting Rear Height Control Sensor Sub-Assembly
      G04944653Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITIONS

      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
      Fig 5: Inspecting Rear Height Control Sensor Wire (LH)
      G06188111Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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 

      RESULT CHART

      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 USING TECHSTREAM (AFS ECU) 
    1. Using the Techstream, read the Data List.

      AFS 

      AFS DATA LIST

      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.: 0 V, Max.: 5 V 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.

      Standard voltage 

      VOLTAGE SPECIFIED CONDITIONS

      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
      Fig 6: Identifying A39 Suspension Control ECU Connector Terminals
      G04944655Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITIONS

      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.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITIONS

      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
      Fig 7: Identifying A37 And A39 ECU Connector Terminals
      G04944656Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: REPLACE AFS ECU (See  REMOVAL   ) 

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