VEHICLE DYNAMICS CONTROL (VDC) > Yaw Rate and Lateral G Sensor

INSPECTION

1. LATERAL G SENSOR SIGNAL

STEPCHECKYESNO

1.CHECK SUBARU SELECT MONITOR.

Is the Subaru Select Monitor available?

2.CHECK YAW RATE & LATERAL G SENSOR.

1) Move the vehicle to a level surface.

2) Turn the ignition switch to OFF.

3) Connect the connector to the yaw rate & lateral G sensor.

4) Turn the ignition switch to ON.

5) Measure the voltage between connector terminals of the yaw rate & lateral G sensor when the yaw rate & lateral G sensor is horizontally positioned.

Connector & terminal

(B257) No. 5 (+) — No. 6 (−)

Is the voltage 2.3 — 2.7 V?

Replace the yaw rate & lateral G sensor.

3.CHECK YAW RATE & LATERAL G SENSOR.

1) Remove the yaw rate & lateral G sensors from vehicle.

2) Measure the voltage between connector terminals of the yaw rate & lateral G sensor when the yaw rate & lateral G sensor are inclined 90° to the right.

Connector & terminal

(B257) No. 5 (+) — No. 6 (−)

NOTE:

When the yaw rate & lateral G sensor is moved with its power supply on, DTC of yaw rate & lateral G sensor may be recorded.

Is the voltage 3.3 — 3.7 V?

Replace the yaw rate & lateral G sensor.

4.CHECK YAW RATE & LATERAL G SENSOR.

Measure the voltage between connector terminals of the yaw rate & lateral G sensor when the yaw rate & lateral G sensor are inclined 90° to the left.

Connector & terminal

(B257) No. 5 (+) — No. 6 (−)

NOTE:

When the yaw rate & lateral G sensor is moved with its power supply on, DTC of yaw rate & lateral G sensor may be recorded.

Is the voltage 1.3 — 1.7 V?

Yaw rate & lateral G sensors are normal.

Replace the yaw rate & lateral G sensor.

5.CHECK YAW RATE & LATERAL G SENSOR.

1) Turn the ignition switch to OFF.

2) Connect the Subaru data link connector to the data link connector.

3) Turn the ignition switch to ON.

4) Set the Subaru Select Monitor to {Current Data Display & Save} mode.

5) Set the screen to the {Current Data Display & Save} mode.

6) Read the output voltage of yaw rate & lateral G sensor when the vehicle is in a flat horizontal position.

NOTE:

When the yaw rate & lateral G sensor is moved with its power supply on, DTC of yaw rate & lateral G sensor may be recorded.

Is the reading indicated on monitor display 2.3 to 2.7 V?

Replace the yaw rate & lateral G sensor.

6.CHECK YAW RATE & LATERAL G SENSOR.

1) Remove the console box.

2) Remove the yaw rate & lateral G sensors from vehicle. (Do not disconnect the connector.)

3) Read the Subaru Select Monitor display when the yaw rate & lateral G sensor are inclined 90° to the right.

NOTE:

When the yaw rate & lateral G sensor is moved with its power supply on, DTC of yaw rate & lateral G sensor may be recorded.

Is the reading indicated on monitor display 3.3 to 3.7 V?

Replace the yaw rate & lateral G sensor.

7.CHECK YAW RATE & LATERAL G SENSOR.

Read the Subaru Select Monitor display when the yaw rate & lateral G sensor are inclined 90° to the left.

NOTE:

When the yaw rate & lateral G sensor is moved with its power supply on, DTC of yaw rate & lateral G sensor may be recorded.

Is the reading indicated on monitor display 1.3 to 1.7 V?

Yaw rate & lateral G sensors are normal.

Replace the yaw rate & lateral G sensor.

2. YAW RATE SENSOR SIGNAL

STEPCHECKYESNO

1.CHECK YAW RATE & LATERAL G SENSORS USING AN OSCILLOSCOPE.

1) Connect all connectors.

2) Set an oscilloscope to the TCM connector terminal.

Positive probe; (B257) No. 4

Grounding wire; (B257) No. 6

3) Start the engine.

4) Measure the signal voltage indicated on the oscilloscope.

Is the voltage 2.1 to 2.9 V?

Replace the yaw rate & lateral G sensor.

2.INSPECT USING AN OSCILLOSCOPE.

1) Turn the ignition switch to OFF.

2) Set an oscilloscope to the TCM connector terminal.

Positive probe; (B257) No. 2

Grounding wire; (B257) No. 6

3) Start the engine.

4) Measure the signal voltage indicated on the oscilloscope.

Is the voltage 5 V?

Yaw rate & lateral G sensors are normal.

Replace the yaw rate & lateral G sensor.