DTC    C1715    Front Acceleration Sensor RH

DTC    C1716    Front Acceleration Sensor LH

DTC    C1717    Rear Acceleration Sensor

DTC    C1791    Front Acceleration Sensor RH (Test Mode DTC)

DTC    C1792    Front Acceleration Sensor LH (Test Mode DTC)

DTC    C1793    Rear Acceleration Sensor (Test Mode DTC)

for Preparation Click here


DESCRIPTION

The acceleration sensor assembly detects the amount of vertical force applied to the vehicle when accelerating or decelerating (G (up and down)). The acceleration sensor assemblies are mounted at 3 spots, which are in the absorber control ECU and at the front and rear of the cabin, to independently detect the amount of vertical force applied to the vehicle. The acceleration sensor assembly converts the resistance, which changes according to the acceleration level, into an electric signal, and output it to the absorber control ECU.
The absorber control ECU detects the changes in each signal when performing the Test Mode check and outputs the Test Mode DTCs (C1791, C1792, C1793) if there is no change.

DTC No.
DTC Detection Condition
Trouble Area
C1715
C1791
  1. When either of the following continues for 0.5 seconds or more:
    1. A signal of -9.8m/s2 to 9.8m/s2 or less is not input from the acceleration sensor assemblies to the absorber control ECU with the engine switch on (IG).
    2. The power source voltage of the right front acceleration sensor assembly is 5.5 V or higher or 4.3 V or lower.
Absorber control ECU
(Houses right front acceleration sensor)
C1716
C1792
  1. When either of the following continues for 0.5 seconds or more:
    1. A signal of -9.8m/s2 to 9.8m/s2 or less is not input from the acceleration sensor assemblies to the absorber control ECU with the engine switch on (IG).
    2. The power source voltage of the left front acceleration sensor assembly is 5.5 V or higher or 4.3 V or lower.
  1. Left front acceleration sensor assembly
  2. Left front acceleration sensor assembly circuit
  3. Absorber control ECU
C1717
C1793
  1. When either of the following continues for 0.5 seconds or more:
    1. A signal of -9.8m/s2 to 9.8m/s2 or less is not input from the acceleration sensor assemblies to the absorber control ECU with the engine switch on (IG).
    2. The power source voltage of the rear acceleration sensor assembly is 5.5 V or higher or 4.3 V or lower.
  1. Rear acceleration sensor assembly
  2. Rear acceleration sensor assembly circuit
  3. Absorber control ECU

HINT:
  1. DTC Nos. C1715 and C1791 are the right front acceleration sensor assembly.
  2. DTC Nos. C1716 and C1792 are the left front acceleration sensor assembly.
  3. DTC Nos. C1717 and C1793 are the rear acceleration sensor assembly.
  4. Since the right front acceleration sensor assembly is built into the absorber control ECU, replace the absorber control ECU when DTCs C1715 and C1791 are output.


WIRING DIAGRAM


C107406E01


INSPECTION PROCEDURE

NOTICE:
When replacing the absorber control ECU, check the acceleration sensor assembly signal after replacement (Click here).

HINT:
  1. Check the condition of each related circuit connector before troubleshooting (Click here).
  2. When C1774 is output, inspect and repair the trouble areas indicated by C1774 first (Click here).

1.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to DLC3.

  1. Turn the engine switch on (IG) and turn the intelligent tester main switch on.

  1. Select "Data List" mode on the intelligent tester (Click here).

    Data List: EMS 
    Item
    		Measurement Item/
    Range (Display)
    		Normal Condition
    		Diagnostic Note
    G (Up & Down) Sensor FR
    		G (up & down) FR sensor reading / min.: -1045267.3 mm/s 2, max.: 1045299.2 mm/s2
    		-8820 mm/s2 to 980 mm/s2 at still condition
    		Reading changes when the vehicle (FR) is bounced
    G (Up & Down) Sensor FL
    		G (up & down) FL sensor reading / min.: -1045267.3 mm/s 2, max.: 1045299.2 mm/s2
    		-8820 mm/s2 to 980 mm/s2 at still condition
    		Reading changes when the vehicle (FL) is bounced
    G (Up & Down) Sensor Rear
    		G (up & down) rear sensor reading / min.: -1045267.3 mm/s 2, max.: 1045299.2 mm/s2
    		-8820 mm/s2 to 980 mm/s2 at still condition
    		Reading changes when the vehicle (rear) is bounced

  1. Check that the value of the acceleration sensor read on the intelligent tester changes as the vehicle is bounced.

    OK:
    Acceleration value must change.


    Result:

    Result
    		Proceed To
    OK
    		A
    NG (Front right)
    		A
    NG (Front left)
    		B
    NG (Rear)
    		C



B
Go to step 3

C
Go to step 4
A


2.RECONFIRM DTC

  1. Clear the DTC (Click here).

  1. Perform a road test.

  1. Check if the same DTC is detected (Click here).

    Result:

    Result
    		Proceed To
    DTC is output
    		A
    DTC is output (When troubleshooting accordance with the PROBLEM SYMPTOMS TABLE)
    		B
    DTC is not output
    		C



B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
END
A

REPLACE ABSORBER CONTROL ECU 

3.INSPECT ACCELERATION SENSOR ASSEMBLY (LEFT FRONT)


    F041635E01

  1. Remove the left front acceleration sensor assembly (Click here).

  1. Connect 3 1.5 V dry batteries in series.

  1. Connect terminal 3 (SGB) to the front battery's positive (+) terminal, and terminal 2 (SGG) to the rear battery's negative (-) terminal.

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

    Voltage:
    Tester connection
    		Sensor condition
    		Voltage
    SGFL (1) - SGG (2)
    		Sensor stationary
    		Approx. 2.3 V
    SGFL (1) - SGG (2)
    		Sensor vibrating vertically
    		Change between approx.
    1.0 to 4.0 V

    NOTICE:
    1. Do not apply a voltage of more than 6 V.
    2. Do not drop the acceleration sensor assembly. If it is dropped, replace it with a new one.
    3. The acceleration sensor assembly removed from the vehicle must not be placed upside down.

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



NG
REPLACE ACCELERATION SENSOR ASSEMBLY
OK

GO TO STEP 5 

4.INSPECT ACCELERATION SENSOR ASSEMBLY (REAR)


    F041635E02

  1. Remove the rear acceleration sensor assembly (Click here).

  1. Connect the 3 1.5 V dry batteries in series.

  1. Connect terminal 3 (SGV) to the front battery's positive (+) terminal, and terminal 2 (SGND) to the rear battery's negative (-) terminal.

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

    Voltage:
    Tester connection
    		Sensor condition
    		Voltage
    SGRR (1) - SGND (2)
    		Sensor stationary
    		Approx. 2.3 V
    SGRR (1) - SGND (2)
    		Sensor vibrating vertically
    		Change between approx.
    1.0 to 4.0 V

    NOTICE:
    1. Do not apply a voltage of more than 6 V.
    2. Do not drop the acceleration sensor assembly. If it is dropped, replace it with a new one.
    3. The acceleration sensor assembly removed from the vehicle must not be placed upside down.

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



NG
REPLACE ACCELERATION SENSOR ASSEMBLY
OK


5.CHECK HARNESS AND CONNECTOR (ABSORBER CONTROL ECU TO ACCELERATION SENSOR ASSEMBLY)


    C110764E03

  1. Front: (C1716, C1792)

    1. Disconnect the absorber control ECU connector and acceleration sensor assembly connector.

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

      Resistance:
      Tester connection
      		Specified condition
      V2-29 (SGFL) - L24-1 (SGFL)
      		Below 1 Ω
      V2-11 (SGL3) - L24-2 (SGG)
      		Below 1 Ω
      V2-16 (SBL3) - L24-3 (SGB)
      		Below 1 Ω
      V2-29 (SGFL) - Body ground
      		10 kΩ or higher
      V2-11 (SGL3) - Body ground
      		10 kΩ or higher
      V2-16 (SBL3) - Body ground
      		10 kΩ or higher



    C110764E04

  1. REAR: (C1717, C1793)

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

      Resistance:
      Tester connection
      		Specified condition
      V2-27 (SGRR) - V26-1 (SGRR)
      		Below 1 Ω
      V2-12 (SGR3) - V26-2 (SGND)
      		Below 1 Ω
      V2-15 (SBR3) - V26-3 (SGV)
      		Below 1 Ω
      V2-27 (SGRR) - Body ground
      		10 kΩ or higher
      V2-12 (SGR3) - Body ground
      		10 kΩ or higher
      V2-15 (SBR3) - Body ground
      		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.RECONFIRM DTC

  1. Clear the DTC (Click here).

  1. Perform a road test.

  1. Check if the same DTC is detected (Click here).

    HINT:
    Reinstall the sensor, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.


    Result:

    Result
    		Proceed To
    DTC is output
    		A
    DTC is output (When troubleshooting in accordance with the PROBLEM SYMPTOMS TABLE)
    		B
    DTC is not output
    		C



B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
END
A

REPLACE ABSORBER CONTROL ECU