VEHICLE STABILITY CONTROL SYSTEM

TEST MODE PROCEDURE (SIGNAL CHECK) (When Using Intelligent Tester)

Note

After replacement of the brake actuator assembly and/or yaw rate and acceleration sensor, perform zero point calibration of the yaw rate and acceleration sensor.

Tech Tips

If the ignition switch is turned from ON to ACC or off during Test Mode (signal check), DTCs recorded during the sensor check will be cleared.
During Test Mode (signal check), the skid control ECU records all DTCs detected in the sensor check. By performing Test Mode (signal check), the codes are cleared if a normal condition is confirmed. The remaining codes are the codes indicating where an abnormality was found.

Procedure to enter Test Mode.

Turn the ignition switch off.
Check that the steering wheel is in the straight-ahead position.
for Automatic Transaxle model

Check that the shift lever is in P and apply the parking brake.

for Manual Transaxle model

Check that the shift lever is in N and apply the parking brake.
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the intelligent tester on.
Switch the skid control ECU to Test Mode using the intelligent tester. Enter the following menus: Chassis / ABS/VSC/TRC / Signal Check.

Check that the ABS warning and VSC OFF indicator lights come on for several seconds and then blink in the Test Mode blinking pattern.

Tech Tips

If the ABS warning and VSC OFF indicator lights do not blink, inspect the TS and CG terminal circuit and ABS warning and VSC OFF indicator light circuits.

Trouble Area	See procedure
TS and CG terminal circuit	Click here
ABS warning light circuit (Remains on)	Click here
ABS warning light circuit (Does not come on)	Click here
VSC OFF indicator light circuit (Remains on)	Click here
VSC OFF indicator light circuit (Does not come on)	Click here

ACCELERATION SENSOR CHECK (When Using Intelligent Tester)

Keep the vehicle stationary on a level surface for 1 second or more.

Tech Tips

The acceleration sensor check can be performed with the master cylinder pressure sensor check below.

MASTER CYLINDER PRESSURE SENSOR CHECK (When Using Intelligent Tester)

Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, and quickly and continuously depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more for 1 second.
Check that the ABS warning light stays on for 3 seconds.
Tech Tips
- Ensure that the ABS warning light comes on.
- While the ABS warning light stays on, continue to depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more.
- The ABS warning light comes on for 3 seconds every time the brake pedal operation above is performed.
- If the master cylinder pressure sensor check is not completed, depressing the brake pedal causes further decreases in vacuum in the brake booster, making the sensor check difficult to complete.
- If the vacuum is insufficient, the master cylinder pressure sensor check may not be completed. In this case, run the engine at idle to obtain sufficient vacuum.
- If the brake pedal is strongly depressed when the vacuum is insufficient, the brake warning light may come on in accordance with booster pressure control. In this case, run the engine at idle to obtain sufficient vacuum.

SPEED SENSOR CHECK (When Using Intelligent Tester)

Check the speed sensor signal.

Note

Before performing the speed sensor signal check, complete the acceleration sensor and master cylinder pressure sensor checks.
1. Drive the vehicle straight-ahead.
  
  Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds and check that the ABS warning light goes off.
  - The sensor check may not be completed if wheelspin occurs.
  - The ABS warning light blinks when the sensor check has been completed and the brake pedal is depressed.
  - The ABS warning light comes on immediately after a malfunction has been detected during the speed sensor check.
Stop the vehicle.
Note
- The speed sensor check may not be completed if the sensor check is started with the steering wheel turned or one or more wheels spinning.
- After the ABS warning light goes off and if the vehicle speed exceeds 80 km/h (50 mph), a sensor check code will be stored again. Decelerate or stop the vehicle before the speed reaches 80 km/h (50 mph).
- If the sensor check has not been completed, the ABS warning light blinks during driving and the ABS system does not operate.
Tech Tips

When the sensor check has been completed, the ABS warning light remains off during driving and blinks in the Test Mode pattern while the vehicle is stationary.

YAW RATE SENSOR CHECK (When Using Intelligent Tester)

Check the output of the yaw rate sensor.
1. Keep the vehicle in a stationary condition on a level surface for 1 second or more.
2. Move the shift lever from P to D (for automatic transaxle model) or release the parking brake (for manual transaxle model) and drive the vehicle at a speed of approximately 5 km/h (3 mph), and turn the steering wheel either to the left or right 90° or more until the vehicle makes a 180° turn.
3. for Automatic Transaxle model
  
  Stop the vehicle, move the shift lever to P, and apply the parking brake. Check that the skid control buzzer sounds for 3 seconds.
  
  for Manual Transaxle model
  
  Stop the vehicle, move the shift lever to N, and apply the parking brake. Check that the skid control buzzer sounds for 3 seconds.
  Tech Tips
  - If the skid control buzzer sounds, the sensor check was completed normally.
  - If the skid control buzzer does not sound, check the skid control buzzer circuit Click here, and then perform the sensor check again.
  - If the skid control buzzer still does not sound, there is a malfunction in the yaw rate sensor, so check the DTC.
  - Make a 180° turn. At the end of the turn, the direction of the vehicle should be 180° +/- 5° of its start position.
  - Do not spin the wheels.
  - Do not turn the ignition switch off while turning.
  - Do not move the shift lever to P (for automatic transaxle model) or do not apply the parking brake (for manual transaxle model) while turning. Changing the vehicle speed, stopping, or driving in reverse is possible.
  - Complete the turn within 20 seconds.

VSC OFF SWITCH CHECK

Briefly press the VSC OFF switch.
Check that the slip indicator light goes off.
Briefly press the VSC OFF switch again to turn the slip indicator light on.

END OF SENSOR CHECK (When Using Intelligent Tester)

If the sensor check is completed, the ABS warning light blinks (Test Mode) when the vehicle stops and the ABS warning light is off while the vehicle is being driven.
Note
- When the yaw rate sensor, acceleration sensor, speed sensor, and master cylinder pressure sensor checks are completed, the sensor check is completed.
- If the sensor check is not completed, the ABS warning light blinks even while the vehicle is being driven and the ABS does not operate.

READ DTC OF SIGNAL CHECK FUNCTION (When Using Intelligent Tester)

Read the DTC(s) by following the tester screen.
Note
- If only the DTCs are displayed, repair the malfunction area and clear the DTCs.
- If Test Mode sensor check DTCs and other DTCs are displayed or if only Test Mode sensor check DTCs are displayed, repair the malfunctions, clear the DTCs, and perform the Test Mode inspection again.

List of DTCs.

ABS Sensor
DTC Code	Detection Item	Trouble Area
C1271	Low output signal from front speed sensor RH	Front speed sensor RH Sensor installation Speed sensor rotor
C1272	Low output signal from front speed sensor LH	Front speed sensor LH Sensor installation Speed sensor rotor
C1273	Low output signal from rear speed sensor RH	Rear speed sensor RH Sensor installation Speed sensor rotor
C1274	Low output signal from rear speed sensor LH	Rear speed sensor LH Sensor installation Speed sensor rotor
C1275	Abnormal change in output signal from front speed sensor RH	Speed sensor rotor
C1276	Abnormal change in output signal from front speed sensor LH	Speed sensor rotor
C1277	Abnormal change in output signal from rear speed sensor RH	Speed sensor rotor
C1278	Abnormal change in output signal from rear speed sensor LH	Speed sensor rotor
C1279	Acceleration sensor output voltage malfunction	Yaw rate and acceleration sensor Sensor installation
C1281	Master cylinder pressure sensor output malfunction	Stop light switch Master cylinder pressure sensor

VSC Sensor
DTC Code	Detection Item	Trouble Area
C0371	Yaw rate sensor	Yaw rate and acceleration sensor

Tech Tips

The codes in this table are output only in Test Mode (signal check).

Turn the ignition switch off and disconnect the intelligent tester.

TEST MODE PROCEDURE (SIGNAL CHECK) (When Using SST Check Wire)

Note

After replacement of the brake actuator assembly and/or yaw rate and acceleration sensor, perform zero point calibration of the yaw rate and acceleration sensor.

Tech Tips

If the ignition switch is turned from ON to ACC or off during Test Mode (signal check), DTCs recorded during the sensor check will be cleared.
During Test Mode (signal check), the skid control ECU records all DTCs detected in the sensor check. By performing Test Mode (signal check), the codes are cleared if a normal condition is confirmed. The remaining codes are the codes indicating where an abnormality was found.

Procedure to enter Test Mode.

Turn the ignition switch off.
Check that the steering wheel is in the straight-ahead position.
for Automatic Transaxle model

Check that the shift lever is in P and apply the parking brake.

for Manual Transaxle model

Check that the shift lever is in N and apply the parking brake.
Text in Illustration

*1 Front view of DLC3

Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.

SST

09843-18040
Turn the ignition switch to ON.

Text in Illustration
*1	Front view of DLC3

Check that the ABS warning and VSC OFF indicator lights come on for several seconds and then blink in Test Mode.

Tech Tips

If the ABS warning and VSC OFF indicator lights do not blink, inspect the TS and CG terminal circuit and ABS warning and VSC OFF indicator light circuits.

Trouble Area	See procedure
TS and CG terminal circuit	Click here
ABS warning light circuit (Remains on)	Click here
ABS warning light circuit (Does not come on)	Click here
VSC OFF indicator light circuit (Remains on)	Click here
VSC OFF indicator light circuit (Does not come on)	Click here

ACCELERATION SENSOR CHECK (When Using SST Check Wire)

Keep the vehicle stationary on a level surface for 1 second or more.

Tech Tips

The acceleration sensor check can be performed with the master cylinder pressure sensor check below.

MASTER CYLINDER PRESSURE SENSOR CHECK (When Using SST Check Wire)

Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, and quickly and continuously depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more for 1 second.
Check that the ABS warning light stays on for 3 seconds.
Tech Tips
- Ensure that the ABS warning light comes on.
- While the ABS warning light stays on, continue to depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more.
- The ABS warning light comes on for 3 seconds every time the brake pedal operation above is performed.
- If the master cylinder pressure sensor check is not completed, depressing the brake pedal causes further decreases in vacuum in the brake booster, making the sensor check difficult to complete.
- If the vacuum is insufficient, the master cylinder pressure sensor check may not be completed. In this case, run the engine at idle to obtain sufficient vacuum.
- If the brake pedal is strongly depressed when the vacuum is insufficient, the brake warning light may come on in accordance with booster pressure control. In this case, run the engine at idle to obtain sufficient vacuum.

SPEED SENSOR CHECK (When Using SST Check Wire)

Check the speed sensor signal.

Note

Before performing the speed sensor signal check, complete the acceleration sensor and master cylinder pressure sensor signal checks.
1. Drive the vehicle straight-ahead.
  
  Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds and check that the ABS warning light goes off.
  - The sensor check may not be completed if wheelspin occurs.
  - The ABS warning light blinks when the sensor check has been completed and the brake pedal is depressed.
  - The ABS warning light comes on immediately after a malfunction has been detected during the speed sensor check.
Stop the vehicle.
Note
- The speed sensor check may not be completed if the sensor check is started with the steering wheel turned or one or more wheels spinning.
- After the ABS warning light goes off and if the vehicle speed exceeds 80 km/h (50 mph), a sensor check code will be stored again. Decelerate or stop the vehicle before the speed reaches 80 km/h (50 mph).
- If the sensor check has not been completed, the ABS warning light blinks during driving and the ABS system does not operate.
Tech Tips

When the sensor check has been completed, the ABS warning light remains on during driving and blinks in the Test Mode pattern while the vehicle is stationary.

YAW RATE SENSOR CHECK (When Using SST Check Wire)

Check the output of the yaw rate sensor.
1. Keep the vehicle stationary on a level surface for 1 second or more.
2. Move the shift lever from P to D (for automatic transaxle model) or release the parking brake (for manual transaxle model) and drive the vehicle at a vehicle speed of approximately 5 km/h (3 mph) and turn the steering wheel either to the left or right 90° or more and until the vehicle makes a 180° turn.
3. for Automatic Transaxle model
  
  Stop the vehicle, move the shift lever to P, and apply the parking brake. Check that the skid control buzzer sounds for 3 seconds.
  
  for Manual Transaxle model
  
  Stop the vehicle, move the shift lever to N, and apply the parking brake. Check that the skid control buzzer sounds for 3 seconds.
  Tech Tips
  - If the skid control buzzer sounds, the sensor check was completed normally.
  - If the skid control buzzer does not sound, check the skid control buzzer circuit Click here, and then perform the sensor check again.
  - If the skid control buzzer still does not sound, there is a malfunction in the yaw rate sensor, so check the DTC.
  - Make a 180° turn. At the end of the turn, the direction of the vehicle should be 180° +/- 5° of its start position.
  - Do not allow the wheels to spin.
  - Do not turn the ignition switch off while turning.
  - Do not move the shift lever to P (for automatic transaxle model) or do not apply the parking brake (for manual transaxle model) while turning. Changing the vehicle speed, stopping, or driving in reverse is possible.
  - Complete the turn within 20 seconds.

VSC OFF SWITCH CHECK

Briefly press the VSC OFF switch.
Check that the slip indicator light goes off.
Briefly press the VSC OFF switch again to turn the slip indicator light on.

END OF SENSOR CHECK (When Using SST Check Wire)

If the sensor check is completed, the ABS warning light blinks (Test Mode) when the vehicle stops and the ABS warning light is off while the vehicle is being driven.
Note
- When the yaw rate sensor, acceleration sensor, speed sensor, and master cylinder pressure sensor checks are completed, the sensor check is completed.
- If the sensor check is not completed, the ABS warning light will blink even while the vehicle is driven and the ABS will not operate.

READ DTC OF SIGNAL CHECK FUNCTION (When Using SST Check Wire)

Text in Illustration

*1 Front view of DLC3

Using SST, connect terminals 12 (TS), 13 (TC) and 4 (CG) of the DLC3.

SST

09843-18040
Count the number of blinks of the ABS warning and VSC OFF indicator lights.
Note
- If only DTCs other than Test Mode sensor check DTCs are displayed, repair the malfunctions and clear the DTCs.
- If Test Mode sensor check DTCs and other DTCs are displayed or if only Test Mode sensor check DTCs are displayed, repair the malfunctions, clear the DTCs, and perform the Test Mode inspection again.
Tech Tips
- If more than 1 malfunction is detected at the same time, the lowest numbered code will be displayed first.
- See the list of DTCs (See procedure "A").
After performing the check, disconnect SST from terminals TS and CG, and TC and CG of the DLC3 and turn the ignition switch off.
Turn the ignition switch to ON.
Tech Tips
- If the ignition switch is not turned to ON after SST is removed from the DLC3, the previous Test Mode will continue.
- If the ignition switch is turned to ON with terminals TS and CG shorted, the previous Test Mode will continue.

Text in Illustration
*1	Front view of DLC3

DTC OF TEST MODE (SIGNAL CHECK) FUNCTION (Procedure "A")

ABS Sensor
DTC Code	Detection Item	Trouble Area
71	Low output signal from front speed sensor RH	Front speed sensor RH Sensor installation Speed sensor rotor
72	Low output signal from front speed sensor LH	Front speed sensor LH Sensor installation Speed sensor rotor
73	Low output signal from rear speed sensor RH	Rear speed sensor RH Sensor installation Speed sensor rotor
74	Low output signal from rear speed sensor LH	Rear speed sensor LH Sensor installation Speed sensor rotor
75	Abnormal change in output signal from front speed sensor RH	Speed sensor rotor
76	Abnormal change in output signal from front speed sensor LH	Speed sensor rotor
77	Abnormal change in output signal from rear speed sensor RH	Speed sensor rotor
78	Abnormal change in output signal from rear speed sensor LH	Speed sensor rotor
79	Acceleration sensor output voltage malfunction	Yaw rate and acceleration sensor Sensor installation
81	Master cylinder pressure sensor output malfunction	Stop light switch Master cylinder pressure sensor

VSC Sensor
DTC Code	Detection Item	Trouble Area
71	Yaw rate sensor	Yaw rate and acceleration sensor

Tech Tips

The codes in this table are output only in Test Mode (signal check).