AIR SUSPENSION SYSTEM, Diagnostic DTC:C1715/15, C1716/16, C1717/17, C1796/96, C1797/97, C1798/98

DTC Code DTC Name
C1715/15 Front Acceleration Sensor RH Malfunction
C1716/16 Front Acceleration Sensor LH Malfunction
C1717/17 Rear Acceleration Sensor Malfunction
C1796/96 (Up & Down) G Sensor FR
C1797/97 (Up & Down) G Sensor FL
C1798/98 (Up & Down) G Sensor Rear

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 suspension control ECU. Up and down G sensors are installed in 3 locations: 1) the suspension control ECU, 2) the RH side instrument panel, and 3) behind the deck trim side panel assembly LH. Each up and down G sensor independently detects the upward and downward acceleration. During a test mode inspection, the suspension control ECU reads the fluctuations in each sensor signal. If a sensor signal does not fluctuate, test mode DTCs C1796/96, C1797/97 and C1798/98 are stored.

DTC Code DTC Detection Condition Trouble Area
C1715/15

Either condition is met:


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

  • With the ignition switch ON, a voltage of 4.7 V or higher or 0.3 V or less at the front acceleration sensor RH is detected for 1 second.

  • Harness or connector

  • Front acceleration sensor RH

  • Suspension control ECU
C1716/16

Either condition is met:


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

  • With the ignition switch ON, a voltage of 4.7 V or higher or 0.3 V or less at the front acceleration sensor LH is detected for 1 second.

 Suspension control ECU (Front acceleration sensor LH)
C1717/17

Either condition is met:


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

  • With the ignition switch ON, a voltage of 4.7 V or higher or 0.3 V or less at the rear acceleration sensor is detected for 1 second.

  • Harness or connector

  • Rear acceleration sensor

  • Suspension control ECU
C1796/96

On a level surface, the G sensor input is +/- 1.96 m/s2or more for 1 second or more.

  • Harness or connector

  • Front acceleration sensor RH

  • Suspension control ECU
C1797/97

On a level surface, the G sensor input is +/- 1.96 m/s2or more for 1 second or more.

 Suspension control ECU (Front acceleration sensor LH)
C1798/98

On a level surface, the G sensor input is +/- 1.96 m/s2or more for 1 second or more.

  • Harness or connector

  • Rear acceleration sensor

  • Suspension control ECU

Tech Tips

If DTCs C1716/16 and C1797/97 are output, replace the suspension control ECU (houses the front acceleration sensor LH).

WIRING DIAGRAM

A01DMNNE05

INSPECTION PROCEDURE

Note

When replacing the suspension control ECU, perform registration Click here.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (G SENSOR)


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the intelligent tester on.

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

      Air Suspension
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      (Up & Down) G Sensor FR

      (Up & Down) G sensor (Front RH)/

      Min.: -1045.29 m/s2

      Max.: 1045.26 m/s2

      0 +/- 0.98 m/s2when stationary

      		 The value changes when the vehicle (Front RH) is bounced.
      (Up & Down) G Sensor FL

      (Up & Down) G sensor (Front LH)/

      Min.: -1045.29 m/s2

      Max.: 1045.26 m/s2

      0 +/- 0.98 m/s2when stationary

      		 The value changes when the vehicle (Front LH) is bounced.
      (Up & Down) G Sensor Rear

      (Up & Down) G sensor (Rear)/

      Min.: -1045.29 m/s2

      Max.: 1045.26 m/s2

      0 +/- 0.98 m/s2when stationary

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

    NG

    INSPECT ACCELERATION SENSOR (FRONT RH OR REAR) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  2. INSPECT ACCELERATION SENSOR (FRONT RH OR REAR)

    A01DOSFE04
    Text in Illustration
    *A for Front RH
    *B for Rear
    *a

    Component without harness connected

    (Acceleration Sensor)
    A01DQPB Upside
    A01DMKT Downside

    1. Check the front acceleration sensor RH (when DTC C1715/15 or C1796/96 is output).


      1. Remove the front acceleration sensor RH Click here.

      2. Connect 3 dry cell batteries of 1.5 V in series.

      3. Connect the positive (+) end of the batteries to terminal 3 (SHB) of the acceleration sensor and the negative (-) end of the batteries to terminal 2 (SHG). Then measure the voltage between terminal 1 (SGFL) and terminal 2 (SHG).

      4. Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        Tester Connection Condition Specified Condition
        1 (SGFL) - 2 (SHG) Sensor in vertical position Approx. 2.0 to 2.5 V
        Sensor tilted left or right from vertical position Changes between approx. 0.9 and 2.3 V

    2. Check the rear acceleration sensor: (when DTC C1717/17 or C1798/98 is output).


      1. Remove the rear acceleration sensor Click here.

      2. Connect 3 dry cell batteries of 1.5 V in series.

      3. Connect the positive (+) end of the batteries to terminal 3 (SGV) of the acceleration sensor and the negative (-) end of the batteries to terminal 2 (SGND). Then measure the voltage between terminal 1 (SGRR) and terminal 2 (SGND).

      4. Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        Tester Connection Condition Specified Condition
        1 (SGRR) - 2 (SGND) Sensor in vertical position Approx. 2.0 to 2.5 V
        Sensor tilted left or right from vertical position Changes between approx. 0.9 and 2.3 V

        Note

        Do not apply a voltage of higher than 6 V.

        Tech Tips

        When the acceleration sensor is tilted, it may output a different value.

        Result
        Result Proceed to
        OK A
        NG (Front acceleration sensor RH) B
        NG (Rear acceleration sensor) C

    B

    REPLACE FRONT ACCELERATION SENSOR RH Click here

    C

    REPLACE REAR ACCELERATION SENSOR Click here

    A

  3. CHECK HARNESS AND CONNECTOR (ACCELERATION SENSOR - SUSPENSION CONTROL ECU)


    1. Check the front acceleration sensor RH (when DTC C1715/15 or C1796/96 is output).


      1. Disconnect the A13 front acceleration sensor RH connector.

      2. Disconnect the A14 suspension control ECU connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A13-1 (SGFL) - A14-18 (SGFR) Always Below 1 Ω
        A13-2 (SHG) - A14-10 (SGR) Always Below 1 Ω
        A13-3 (SHB) - A14-9 (SBR) Always Below 1 Ω
        A13-1 (SGFL) - Body ground Always 10 kΩ or higher
        A13-2 (SHG) - Body ground Always 10 kΩ or higher
        A13-3 (SHB) - Body ground Always 10 kΩ or higher

    2. Check the rear acceleration sensor: (when DTC C1717/17 or C1798/98 is output).


      1. Disconnect the R18 rear acceleration sensor connector.

      2. Disconnect the A49 suspension control ECU connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        R18-1 (SGRR) - A49-26 (SGRR) Always Below 1 Ω
        R18-2 (SGND) - A49-16 (SGR3) Always Below 1 Ω
        R18-3 (SGV) - A49-17 (SBR3) Always Below 1 Ω
        R18-1 (SGRR) - Body ground Always 10 kΩ or higher
        R18-2 (SGND) - Body ground Always 10 kΩ or higher
        R18-3 (SGV) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE SUSPENSION CONTROL ECU Click here