WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK
Release the parking brake.
Note
When releasing the parking brake, move the shift lever to P (except Manual Transaxle) or set chocks (for Manual Transaxle) to prevent the vehicle from rolling.
Tech Tips
When the parking brake is applied or the brake fluid level is low, the brake warning light comes on.
When the ignition switch is turned to ON, check that the ABS warning, brake warning, VSC OFF indicator, TRC/TRAC OFF indicator*1, AUTO LSD indicator*2, downhill assist control indicator*3 and slip indicator lights come on for approximately 3 seconds.
*1: for Segment Display Type
*2: for 2WD
*3: w/ Downhill Assist Control
Tech Tips
If the skid control ECU (brake actuator assembly) stores any DTCs, the ABS warning and slip indicator lights will come on.
If any of the indicators remain on or do not come on, proceed to troubleshooting for the light circuits listed below.
Trouble Area | See Procedure |
---|---|
ABS warning light circuit (Remains on) | |
ABS warning light circuit (Does not come on) | |
Brake warning light circuit (Remains on) | |
Brake warning light circuit (Does not come on) | |
TRC/TRAC OFF indicator light circuit (Remains on)*1 | |
TRC/TRAC OFF indicator light circuit (Does not come on)*1 | |
VSC OFF indicator light circuit (Remains on) | |
VSC OFF indicator light circuit (Does not come on) | |
Slip indicator light circuit (Remains on) | |
Slip indicator light circuit (Does not come on) | |
Downhill assist control indicator light circuit (Remains on) | |
Downhill assist control indicator light circuit (Does not come on) | |
AUTO LSD indicator light circuit (Remains on)*2 | |
AUTO LSD indicator light circuit (Does not come on)*2 |
*1: for Segment Display Type
*2: for 2WD
ACTIVATE TEST MODE (SIGNAL CHECK) (When Using GTS)
Tech Tips
VSC does not operate in Test Mode (signal check), regardless of whether the sensor check is normal or abnormal.
When a malfunction occurs in an ABS system sensor, the ABS warning light illuminates.
When a malfunction occurs in a VSC system sensor, the slip indicator light illuminates.
Procedure to enter Test Mode (signal check).
Turn the ignition switch to ON.
Make sure the shift lever is in P.
Apply the parking brake.
Put the steering wheel in the neutral position.
Turn the ignition switch off and connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Signal Check.
Tester Display |
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Signal Check |
Tech Tips
Signals related to the VSC system can be inspected by performing a Test Mode (signal check) inspection. During the inspection, the display of items determined normal by the skid control ECU (brake actuator assembly) changes from incomplete to complete.
Item Name | Range | Judgment Description | Trouble Area |
Output Signal of Front Speed Sensor RH | Incomplete/complete | Check for foreign matter, evaluate the gap between the sensor and rotor |
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Output Signal of Front Speed Sensor LH | Incomplete/complete | Check for foreign matter, evaluate the gap between the sensor and rotor |
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Output Signal of Rear Speed Sensor RH | Incomplete/complete | Check for foreign matter, evaluate the gap between the sensor and rotor |
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Output Signal of Rear Speed Sensor LH | Incomplete/complete | Check for foreign matter, evaluate the gap between the sensor and rotor |
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Change in Output Signal of Front Speed Sensor RH | Incomplete/complete |
|
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Change in Output Signal of Front Speed Sensor LH | Incomplete/complete |
|
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Change in Output Signal of Rear Speed Sensor RH | Incomplete/complete |
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Change in Output Signal of Rear Speed Sensor LH | Incomplete/complete |
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Output Voltage Deceleration Sensor | Incomplete/complete | Evaluate the acceleration sensor output voltage |
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Memory System Information | Incomplete/complete | Evaluate stored system information (skid control ECU (brake actuator assembly)) against vehicle specification |
|
Output Master Cylinder Pressure Sensor | Incomplete/complete |
|
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ACTIVATE TEST MODE (SIGNAL CHECK) (When Using SST Check Wire)
Tech Tips
VSC does not operate in Test Mode (signal check), regardless of whether the sensor check is normal or abnormal.
When a malfunction occurs in an ABS system sensor, the ABS warning light illuminates.
When a malfunction occurs in a VSC system sensor, the slip indicator light illuminates.
Procedure to enter Test Mode (signal check).
Turn the ignition switch to ON.
for Manual Transaxle:
Check that the shift lever is in neutral and apply the parking brake.
except Manual Transaxle:
Check that the shift lever is in P and apply the parking brake.
Put the steering wheel in the neutral position.
Turn the ignition switch off.
*a | Front view of DLC3 |
Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.
Turn the ignition switch to ON.
Check that the ABS warning and slip indicator lights come on for several seconds and then blink in Test Mode.
Tech Tips
If the ABS warning and slip indicator lights do not blink, inspect the TS and CG terminal circuit and ABS warning and slip indicator light circuits.
Trouble Area | See Procedure |
---|---|
TS and CG terminal circuit | |
ABS warning light circuit (Remains on) | |
ABS warning light circuit (Does not come on) | |
Slip indicator light circuit (Remains on) | |
Slip indicator light circuit (Does not come on) |
ACCELERATION SENSOR CHECK
Enter Test Mode (signal check).
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
Enter Test Mode (signal check).
Start the engine.
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.
Note
Before performing the speed sensor signal check, complete the acceleration sensor and master cylinder pressure sensor checks.
SPEED SENSOR CHECK
Enter Test Mode (signal check).
Start the engine.
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 (signal check) pattern while the vehicle is stationary.
END OF SENSOR CHECK
If the sensor check is completed, the ABS warning light and slip indicator light blink (Test Mode (signal check)) when the vehicle stops and the ABS warning light is off while the vehicle is being driven.
Note
When Test Mode (signal check) is started with the GTS and all items display complete, the sensor check ends.
If the sensor check is not complete, the ABS warning light blinks when the vehicle is in motion and the ABS does not operate.
If a DTC is detected in Test Mode (signal check), the ABS warning light or slip indicator light illuminates.
END OF TEST MODE (SIGNAL CHECK)
End Test Mode (signal check) using the GTS
Turn the ignition switch off and enter normal mode.
Remove the GTS.
End Test Mode (signal check) by connecting DLC3 terminals
Turn the ignition switch off and disconnect terminals 13 (TC), 12 (TS) and 4 (CG) of the DLC3.
Turn the ignition switch to ON.
Tech Tips
Test Mode (signal check) is continued if 12 (TS) and 4 (CG) are disconnected while the ignition switch is turned to ON.
If the ignition switch is turned to ON with terminals 12 (TS) and 4 (CG) connected, the previous Test Mode (signal check) is maintained.