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 assembly (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 driver side instrument panel, 2) the passenger side instrument panel, and 3) the absorber control ECU.

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.

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
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 assembly 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 assembly RH for 1 second.	Harness or connector Front acceleration sensor assembly RH Absorber control ECU	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 assembly 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 assembly LH for 1 second.	Harness or connector Front acceleration sensor assembly 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.	Absorber control ECU (built into 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 assembly RH for 1 second or more.	Harness or connector Front acceleration sensor assembly RH Absorber control ECU	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 assembly LH for 1 second or more.	Harness or connector Front acceleration sensor assembly 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/s²is not received from the rear acceleration sensor for 1 second or more.	Absorber control ECU (built into rear acceleration sensor)	Test mode

WIRING DIAGRAM


*a	SGG
*b	Front Acceleration Sensor Assembly RH
*c	Front Acceleration Sensor Assembly LH
*d	Absorber Control ECU (Built into 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, perform all of the following again: 1) symptom simulation ; 2) DTC inspection; and 3) GTS inspection (ECU Data List or Active Test Click 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

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

Turn the power switch off.
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.

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.

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
Acceleration value changes.

Result

Result	Proceed to
OK	A
NG (rear)	B
NG (front RH or front LH)	C

B

REPLACE ABSORBER CONTROL ECU Click here

C

GO TO STEP 3 Click here

A

RECONFIRM DTC

Clear the DTCs.

Click here

Chassis > Air suspension > Clear DTCs
Turn the power switch off.

Check for DTCs.

Click here

Chassis > Air suspension > Trouble Codes

Result

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

B

REPLACE ABSORBER CONTROL ECU Click here

C

USE SIMULATION METHOD TO CHECK Click here

A

INSPECT ACCELERATION SENSOR ASSEMBLY (FRONT RH OR FRONT LH)

Turn the power switch off.
Remove the front acceleration sensor assembly RH or front acceleration sensor assembly LH.

Click here

Note

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

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

Click here

Result

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

B

REPLACE FRONT ACCELERATION SENSOR ASSEMBLY RH Click here

C

REPLACE FRONT ACCELERATION SENSOR ASSEMBLY LH Click here

A

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

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

Disconnect the Q22 absorber control ECU connector.
Disconnect the A39 front acceleration sensor assembly RH connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A39-1 (SGFR) - Q22-23 (SGS1)	Always	Below 1 Ω
A39-2 (SGG) - Q22-22 (SGG1)	Always	Below 1 Ω
A39-3 (SGB) - Q22-14 (SGB1)	Always	Below 1 Ω
A39-1 (SGFR) or Q22-23 (SGS1) - Body ground	Always	10 kΩ or higher
A39-2 (SGG) or Q22-22 (SGG1) - Body ground	Always	10 kΩ or higher
A39-3 (SGB) or Q22-14 (SGB1) - Body ground	Always	10 kΩ or higher

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

Disconnect the Q22 absorber control ECU connector.
Disconnect the A40 front acceleration sensor assembly LH connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A40-1 (SGFL) - Q22-25 (SGS2)	Always	Below 1 Ω
A40-2 (SGG) - Q22-24 (SGG2)	Always	Below 1 Ω
A40-3 (SGB) - Q22-15 (SGB2)	Always	Below 1 Ω
A40-1 (SGFL) or Q22-25 (SGS2) - Body ground	Always	10 kΩ or higher
A40-2 (SGG) or Q22-24 (SGG2) - Body ground	Always	10 kΩ or higher
A40-3 (SGB) or Q22-15 (SGB2) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

OK

REPLACE ABSORBER CONTROL ECU Click here

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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