Acceleration Sensor: Inspection

INSPECT FRONT ACCELERATION SENSOR

Fig 1: Identifying Front Acceleration Sensor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Remove the front acceleration sensor.
Connect 3 dry batteries of 1.5 V in series.
Connect terminal 3 (SHB) to the batteries' positive (+) terminal, and terminal 2 (SHG) to the batteries' negative (-) terminal, then measure the voltage between terminals 1 (SGFL) and 2 (SHB) in the following conditions.
Standard voltage

VOLTAGE SPECIFICATION

Sensor Condition	Voltage
Sensor stationary	Approx. 2.3 V
Sensor vibrating vertically	Change between approx. 1.0 to 4.0 V

NOTE:

Do not apply more than 6 V.
Do not drop the front acceleration sensor. If it is dropped, replace it with a new one.
Never place the front acceleration sensor removed from the vehicle upside down.

HINT:

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

INSPECT REAR ACCELERATION SENSOR

Fig 2: Identifying Rear Acceleration Sensor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Remove the rear acceleration sensor.
Connect 3 dry batteries of 1.5 V in series.
Connect terminal 3 (SGV) to the batteries' positive (+) terminal, and terminal 2 (SGMD) to the batteries' negative (-) terminal, then measure the voltage between terminals 1 (SGRR) and 2 (SGMD) in the following conditions.
Standard voltage

VOLTAGE SPECIFICATION

Sensor Condition	Voltage
Sensor stationary	Approx. 2.3 V
Sensor vibrating vertically	Change between approx. 1.0 to 4.0 V

NOTE:

Do not apply more than 6 V.
Do not drop the rear acceleration sensor. If it is dropped, replace it with a new one.
Never place the rear acceleration sensor removed from the vehicle upside down.

HINT:

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