AIR SUSPENSION SYSTEM, Diagnostic DTC:C1715/15,C1716/16,C1717/17,C1796/96,C1797/97 and 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 No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

C1715/15

Front Acceleration Sensor RH Malfunction

Either condition is met:

  • With the engine switch on (IG), 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 engine switch on (IG), 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

Not indicated

C1716/16

Front Acceleration Sensor LH Malfunction

Either condition is met:

  • With the engine switch on (IG), 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 engine switch on (IG), 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)

Not indicated

C1717/17

Rear Acceleration Sensor Malfunction

Either condition is met:

  • With the engine switch on (IG), 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 engine switch on (IG), 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

Not indicated

C1796/96

(Up & Down) G Sensor FR

On a level surface, the G sensor input is +/- 1.96 m/s2 or more for 1 second or more.

  • Harness or connector

  • Front acceleration sensor RH

  • Suspension control ECU

-

C1797/97

(Up & Down) G Sensor FL

On a level surface, the G sensor input is +/- 1.96 m/s2 or more for 1 second or more.

Suspension control ECU (front acceleration sensor LH)

-

C1798/98

(Up & Down) G Sensor Rear

On a level surface, the G sensor input is +/- 1.96 m/s2 or more for 1 second or more.

  • Harness or connector

  • Rear acceleration sensor

  • Suspension control ECU

-
Tip:

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

WIRING DIAGRAM

C179515E11

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. READ VALUE USING INTELLIGENT TESTER (G SENSOR)

    1. Turn the engine switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the intelligent tester 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 +/- 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 +/- 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 +/- 0.98 m/s2 when stationary

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

      OK

      Acceleration value changes.

      Result

      Result

      OK

      NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick hereClick here

    NG

  2. INSPECT ACCELERATION SENSOR (FRONT RH OR REAR)

    1. C214175C01

      *A

      for Front RH

      *B

      for Rear

      *a

      Component without harness connected

      (Acceleration Sensor)

      *b

      Up

      *c

      Down

      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.

        Tip:

        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 A10 front acceleration sensor RH connector.

      2. Disconnect the A11 suspension control ECU connector.

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

        Standard Resistance

        Tester Connection

        Condition

        Specified Condition

        A10-1 (SGFL) - A11-18 (SGFR)

        Always

        Below 1 Ω

        A10-2 (SHG) - A11-10 (SGR)

        Always

        Below 1 Ω

        A10-3 (SHB) - A11-9 (SBR)

        Always

        Below 1 Ω

        A10-1 (SGFL) - Body ground

        Always

        10 kΩ or higher

        A10-2 (SHG) - Body ground

        Always

        10 kΩ or higher

        A10-3 (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 R21 rear acceleration sensor connector.

      2. Disconnect the A40 suspension control ECU connector.

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

        Standard Resistance

        Tester Connection

        Condition

        Specified Condition

        R21-1 (SGRR) - A40-26 (SGRR)

        Always

        Below 1 Ω

        R21-2 (SGND) - A40-16 (SGR3)

        Always

        Below 1 Ω

        R21-3 (SGV) - A40-17 (SBR3)

        Always

        Below 1 Ω

        R21-1 (SGRR) - Body ground

        Always

        10 kΩ or higher

        R21-2 (SGND) - Body ground

        Always

        10 kΩ or higher

        R21-3 (SGV) - Body ground

        Always

        10 kΩ or higher

        Result

        Result

        OK

        NG
    OK

    REPLACE SUSPENSION CONTROL ECU

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR