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

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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)
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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.

Up and down G sensors are installed in 3 locations: 1) the absorber control ECU, 2) the driver side instrument panel, and 3) behind the inner luggage compartment trim cover RH.

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 reads the fluctuations in each sensor signal.

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
C1715 Front Acceleration Sensor RH Malfunction

Either condition is met:


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

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

 Absorber control ECU (built into front acceleration sensor RH) Does not come on
C1716 Front Acceleration Sensor LH Malfunction

Either condition is met:


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

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

  • Harness or connector

  • Front acceleration sensor LH

  • Absorber control ECU

 Does not come on
C1717 Rear Acceleration Sensor Malfunction

Either condition is met:


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

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

  • Harness or connector

  • Rear acceleration sensor

  • Absorber control ECU

 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/s2 is not received from the front acceleration sensor RH for 1 second or more.

 Absorber control ECU (built into front acceleration sensor RH) 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/s2 is not received from the front acceleration sensor LH for 1 second or more.

  • Harness or connector

  • Front acceleration sensor LH

  • Absorber control ECU

 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/s2 is not received from the rear acceleration sensor for 1 second or more.

  • Harness or connector

  • Rear acceleration sensor

  • Absorber control ECU

 Test mode
Table 1. *a SGG *b Front Acceleration Sensor LH *c Rear Acceleration Sensor *d Absorber Control ECU (built into Front Acceleration Sensor RH)
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WIRING DIAGRAM

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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.

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  • Before replacing the absorber control ECU, perform all of the following again: 1) symptom simulation ; 2) DTC inspection; and 3) GTS inspection (ECU Data List or Active TestClick here). If no malfunctions are found in other areas, replace the absorber control ECU.

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

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PROCEDURE


  1. Click here

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


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

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


      1. 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.





      1. Chassis > Air suspension > Data List
        Tester Display
        (Up&Down)G Sensor FR
        (Up&Down)G Sensor FL
        (Up&Down)G Sensor Rear






      OK
      Acceleration value changes.
      Result
      Result Proceed to
      OK A
      NG (front RH) B
      NG (front LH or rear) C

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    RECONFIRM DTC


    1. Clear the DTCs.

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      1. Chassis > Air suspension > Clear DTCs


    2. Turn the power switch off.

    3. Check for DTCs.

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      1. Chassis > Air suspension > Trouble Codes


      Result
      Result Proceed to
      DTC is output (front LH or rear) A
      DTC is output (front RH) B
      DTC is not output C

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    INSPECT ACCELERATION SENSOR (FRONT LH OR REAR)


    1. Turn the power switch off.

    2. Remove the front acceleration sensor LH or rear acceleration sensorClick here.

      Note:

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

    3. Inspect the front acceleration sensor LH or rear acceleration sensorClick here.

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

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    CHECK HARNESS AND CONNECTOR (ACCELERATION SENSOR - ABSORBER CONTROL ECU)


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


      1. Disconnect the A64 absorber control ECU connector.

      2. Disconnect the A32 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
        A32-1 (SGFL) - A64-18 (SGS1) Always Below 1 Ω
        A32-2 (SGG) - A64-10 (SGG1) Always Below 1 Ω
        A32-3 (SGB) - A64-9 (SGB1) Always Below 1 Ω
        A32-1 (SGFL) or A64-18 (SGS1) - Body ground Always 10 kΩ or higher
        A32-2 (SGG) or A64-10 (SGG1) - Body ground Always 10 kΩ or higher
        A32-3 (SGB) or A64-9 (SGB1) - Body ground Always 10 kΩ or higher

    2. Check the rear acceleration sensor harness and connector (when DTC C1717 or C1798 is output).


      1. Disconnect the K39 absorber control ECU connector.

      2. Disconnect the P18 rear acceleration sensor connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        P18-1 (SGRR) - K39-26 (SGS2) Always Below 1 Ω
        P18-2 (SGND) - K39-16 (SGG2) Always Below 1 Ω
        P18-3 (SGV) - K39-17 (SGB2) Always Below 1 Ω
        P18-1 (SGRR) or K39-26 (SGS2) - Body ground Always 10 kΩ or higher
        P18-2 (SGND) or K39-16 (SGG2) - Body ground Always 10 kΩ or higher
        P18-3 (SGV) or K39-17 (SGB2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE ABSORBER CONTROL ECUClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR