ADAPTIVE VARIABLE SUSPENSION SYSTEM, Diagnostic DTC:C1715, C1716, C1717, C1796, C1797, C1798

DTC Code DTC Name
C1715 Front Acceleration Sensor RH Malfunction
C1716 Front Acceleration Sensor LH Malfunction
C1717 Rear Acceleration Sensor Malfunction
C1796 Front Acceleration Sensor RH Malfunction (Test Mode DTC)
C1797 Front Acceleration Sensor LH Malfunction (Test Mode DTC)
C1798 Rear Acceleration Sensor Malfunction (Test Mode DTC)

DESCRIPTION

The acceleration sensor (up and down G sensor) detects the upward and downward acceleration of the vehicle and outputs it as a voltage to the absorber control ECU (rear acceleration sensor).

The 3 up and down G sensors are installed in the driver side instrument panel, the passenger side instrument panel and the absorber control ECU (rear acceleration sensor).

Each up and down G sensor independently detects the upward and downward acceleration of the vehicle.

During a test mode inspection, the absorber control ECU (rear acceleration sensor) reads the fluctuations in each sensor signal.

When a sensor signal does not fluctuate, test mode DTCs C1796, C1797 and C1798 remain stored.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Note
C1715 Front Acceleration Sensor RH Malfunction

Either condition is met:


  • With the engine switch on (IG), a voltage of 5.5 V or more, or 4.3 V or less is detected at the power source of the front acceleration sensor RH for 0.5 seconds.

  • With the engine switch on (IG), a voltage of 4.7 V or more, or 0.3 V or less is detected at the front acceleration sensor RH for 1 second.

  • Wire harness or connector

  • Front acceleration sensor RH

  • Absorber control ECU (rear acceleration sensor)

 Does not come on -
C1716 Front Acceleration Sensor LH Malfunction

Either condition is met:


  • With the engine switch on (IG), a voltage of 5.5 V or more, or 4.3 V or less is detected at the power source of the front acceleration sensor LH for 0.5 seconds.

  • With the engine switch on (IG), a voltage of 4.7 V or more, or 0.3 V or less is detected at the front acceleration sensor LH for 1 second.

  • Wire harness or connector

  • Front acceleration sensor LH

  • Absorber control ECU (rear acceleration sensor)

 Does not come on -
C1717 Rear Acceleration Sensor Malfunction

Either condition is met:


  • With the engine switch on (IG), a voltage of 5.5 V or more, or 4.3 V or less is detected at the power source of the rear acceleration sensor for 0.5 seconds.

  • With the engine switch on (IG), a voltage of 4.7 V or more, or 0.3 V or less is detected at the rear acceleration sensor for 1 second.

 Absorber control ECU (rear acceleration sensor) Does not come on -
C1796 Front Acceleration Sensor RH Malfunction (Test Mode DTC)

With the vehicle stationary on a level surface, an acceleration sensor value that is within -1.96 to 1.96 m/s2is not received from the front acceleration sensor RH for 1 second or more.

  • Wire harness or connector

  • Front acceleration sensor RH

  • Absorber control ECU (rear acceleration sensor)

 Test mode -
C1797 Front Acceleration Sensor LH Malfunction (Test Mode DTC)

With the vehicle stationary on a level surface, an acceleration sensor value that is within -1.96 to 1.96 m/s2is not received from the front acceleration sensor LH for 1 second or more.

  • Wire harness or connector

  • Front acceleration sensor LH

  • Absorber control ECU (rear acceleration sensor)

 Test mode -
C1798 Rear Acceleration Sensor Malfunction (Test Mode DTC)

With the vehicle stationary on a level surface, an acceleration sensor value that is within -1.96 to 1.96 m/s2is not received from the rear acceleration sensor for 1 second or more.

 Absorber control ECU (rear acceleration sensor) Test mode -

WIRING DIAGRAM

B005MTVE10
*a SGG
*b Front Acceleration Sensor RH
*c Front Acceleration Sensor LH
*d Absorber Control ECU (Rear Acceleration Sensor)

CAUTION / NOTICE / HINT

Note


  • Before performing troubleshooting, inspect the connectors of related circuits.

  • If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first.

    Click here

  • Before replacing the absorber control ECU (rear acceleration sensor), perform all of the following:


    • Symptom simulation.

      Click here

    • DTC inspection.

      Click here

    • GTS inspection.

      Click here


      • If no malfunctions are found in other areas, replace the absorber control ECU (rear acceleration sensor).

  • When the absorber control ECU (rear acceleration sensor) is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met.

    Click here

PROCEDURE


  1. READ VALUE USING GTS ((UP & DOWN) G SENSOR)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / Air suspension / Data List.


      Chassis > Air suspension > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      (Up&Down)G Sensor FR Front acceleration sensor RH (up and down)

      Min.: -1045.29 m/s2

      Max.: 1045.26 m/s2

      -0.98 to 0.98 m/s2

      when stationary

      		 The value changes when the vehicle (front RH) is bounced.
      (Up&Down)G Sensor FL Front acceleration sensor LH (up and down)

      Min.: -1045.29 m/s2

      Max.: 1045.26 m/s2

      -0.98 to 0.98 m/s2

      when stationary

      		 The value changes when the vehicle (front LH) is bounced.
      (Up&Down)G Sensor Rear Rear acceleration sensor (up and down)

      Min.: -1045.29 m/s2

      Max.: 1045.26 m/s2

      -0.98 to 0.98 m/s2

      when stationary

      		 The value changes when the vehicle (rear) is bounced.

      Chassis > Air suspension > Data List
      Tester Display
      (Up&Down)G Sensor FR
      (Up&Down)G Sensor FL
      (Up&Down)G Sensor Rear
      OK
      The values are as specified in the normal condition column.
      Result
      Result Proceed to
      OK A
      NG (rear) B
      NG (front RH or front LH) C

    B

    REPLACE ABSORBER CONTROL ECU (REAR ACCELERATION SENSOR) Click here

    C

    GO TO STEP 3 Click here

    A

  2. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Chassis > Air suspension > Clear DTCs

    2. Turn the engine switch off.

    3. Check for DTCs.

      Click here


      Chassis > Air suspension > Trouble Codes
      Result
      Result Proceed to
      DTCs are output (front RH or front LH) A
      DTCs are output (rear) B
      DTCs are not output C

    B

    REPLACE ABSORBER CONTROL ECU (REAR ACCELERATION SENSOR) Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. INSPECT ACCELERATION SENSOR (FRONT RH OR FRONT LH)


    1. Turn the engine switch off.

    2. Remove the front acceleration sensor RH or front acceleration sensor LH.

      for LHD: Click here

      for RHD: Click here

      Note

      Do not drop the acceleration sensor. If it is dropped, replace it with a new one.

    3. Inspect the front acceleration sensor RH or front acceleration sensor LH.

      for LHD: Click here

      for RHD: Click here

      Result
      Result Proceed to
      OK A
      Front acceleration sensor RH malfunction B
      Front acceleration sensor LH malfunction C

    B

    REPLACE FRONT ACCELERATION SENSOR RH Click here

    C

    REPLACE FRONT ACCELERATION SENSOR LH Click here

    A

  4. CHECK HARNESS AND CONNECTOR (FRONT ACCELERATION SENSOR - ABSORBER CONTROL ECU (REAR ACCELERATION SENSOR))


    1. Check the front acceleration sensor RH harness and connector (when DTC C1715 or C1796 is output).


      1. Disconnect the S51 absorber control ECU (rear acceleration sensor) connector.

      2. Disconnect the A69 front acceleration sensor RH connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A69-1 (SGFR) - S51-23 (SGS1) Always Below 1 Ω
        A69-2 (SGG) - S51-22 (SGG1) Always Below 1 Ω
        A69-3 (SGB) - S51-14 (SGB1) Always Below 1 Ω
        A69-1 (SGFR) or S51-23 (SGS1) - Body ground Always 10 kΩ or higher
        A69-2 (SGG) or S51-22 (SGG1) - Body ground Always 10 kΩ or higher
        A69-3 (SGB) or S51-14 (SGB1) - Body ground Always 10 kΩ or higher

    2. Check the front acceleration sensor LH harness and connector (when DTC C1716 or C1797 is output).


      1. Disconnect the S51 absorber control ECU (rear acceleration sensor) connector.

      2. Disconnect the A68 front acceleration sensor LH connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A68-1 (SGFL) - S51-25 (SGS2) Always Below 1 Ω
        A68-2 (SGG) - S51-24 (SGG2) Always Below 1 Ω
        A68-3 (SGB) - S51-15 (SGB2) Always Below 1 Ω
        A68-1 (SGFL) or S51-25 (SGS2) - Body ground Always 10 kΩ or higher
        A68-2 (SGG) or S51-24 (SGG2) - Body ground Always 10 kΩ or higher
        A68-3 (SGB) or S51-15 (SGB2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ABSORBER CONTROL ECU (REAR ACCELERATION SENSOR) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR