WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK
When the power switch is turned on (IG), check that the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction) and slip indicator lights come on until the power switch is turned on (READY).
Tech Tips
When the power switch is turned on (IG), the VSC OFF indicator light comes on for approximately 3 seconds.
When the brake fluid level is low, the brake warning light / red (malfunction) comes on.
If the skid control ECU assembly stores any DTCs, the ABS warning, brake warning / red (malfunction), brake warning / yellow (minor malfunction) and slip indicator lights will come on.
If any of the indicators remains on or does 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 / red (malfunction) circuit (Remains on) | |
Brake warning light / red (malfunction) circuit (Does not come on) | |
Brake warning light / yellow (minor malfunction) circuit (Remains on) | |
Brake warning light / yellow (minor malfunction) circuit (Does not come on) | |
Slip indicator light circuit (Remains on) | |
Slip indicator light circuit (Does not come on) | |
VSC OFF indicator light circuit (Remains on) | |
VSC OFF indicator light circuit (Does not come on) |
SENSOR CHECK USING TEST MODE (SIGNAL CHECK)
Note
Before performing the master cylinder pressure sensor check, perform linear valve offset learning.
Tech Tips
If the power switch is turned from on (IG) to on (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 assembly records all DTCs detected in the sensor check. By performing Test Mode (signal check), the codes are cleared as the normal condition for each item is confirmed. The remaining codes are the codes where an abnormality was found.
When entering Test Mode (Signal Check), the skid control ECU assembly communicates with the driving support ECU assembly to judge whether the vehicle is equipped with the pre-collision system. Therefore, do not exit Test Mode (Signal Check) within 5 seconds of entering Test Mode (Signal Check) (w/ Pre-collision System).
Procedure to Enter Test Mode
Turn the power switch off.
Check that the steering wheel is centered.
Check that the shift lever is in P.
Check that the parking brake is applied.
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Switch the skid control ECU assembly to Test Mode using the GTS. Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Signal Check.
Tester Display |
---|
Signal Check |
Tech Tips
Do not exit Test Mode (Signal Check) within 5 seconds of entering Test Mode (Signal Check). If Test Mode (Signal Check) is exited within 5 seconds of entering Test Mode (Signal Check), DTC U1104 may be stored. If DTC U1104 is output after exiting Test Mode (Signal Check), enter Test Mode (Signal Check) again, wait at least 5 seconds, then recheck for DTCs (w/ Pre-collision System).
Check that the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights come on for several seconds and then blink in the Test Mode pattern.
Tech Tips
If the ABS warning, brake warning / yellow (minor malfunction) and slip indicator lights do not blink, inspect the ABS warning, brake warning / yellow (minor malfunction) and slip indicator light circuits.
Check the ABS sensors.
Tech Tips
Check that the ABS warning light is blinking in the Test Mode pattern before performing the following ABS sensor checks.
Acceleration Sensor Check
Keep the vehicle stationary on a level surface for 1 second or more.
Tech Tips
The acceleration sensor check can be performed by following the master cylinder pressure sensor check procedure below.
Master Cylinder Pressure Sensor Check
Note
Before performing the master cylinder pressure sensor check, perform linear valve offset learning.
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 greater than 98 N (10 kgf, 22.0 lbf) for 1 second.
Check that the ABS warning light remains on for 3 seconds.
Tech Tips
Confirm that the ABS warning light comes on.
While the ABS warning light remains on, continue to depress the brake pedal with a force of 98 N (10 kgf, 22.0 lbf) or more.
The ABS warning light comes on for 3 seconds every time the preceding brake pedal operation is performed.
Speed Sensor Check
Note
Before performing the speed sensor check, complete the acceleration sensor and master cylinder pressure sensor checks.
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.
Drive the vehicle in reverse for more than 3 seconds at 3 km/h (2 mph) or more (Reverse signal check).
Tech Tips
The sensor check may not complete if wheelspin occurs.
The ABS warning light comes on immediately if a malfunction is detected during the speed sensor check.
Stop the vehicle.
Note
The speed sensor check may not complete if the speed sensor check is started while turning the steering wheel or spinning the wheels.
After the ABS warning light goes off, if 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 completed, the ABS warning light will blink while the vehicle is being driven and the ABS will not operate.
VSC Sensor Check
Check that the brake warning / yellow (minor malfunction) and slip indicator lights are blinking in the Test Mode pattern before performing the following VSC sensor check.
VSC OFF Switch (Combination Switch Assembly) Check
Press the VSC OFF switch (combination switch assembly).
Check that the TRC OFF message is displayed on the multi-information display.
Press the VSC OFF switch (combination switch assembly) again.
Check that the TRC OFF message is not displayed on the multi-information display.
End of Sensor Check
When the sensor checks have completed, the ABS warning light goes off while the vehicle is being driven, and blinks in the Test Mode pattern while the vehicle is stopped.
Note
When the acceleration sensor, speed sensor and master cylinder pressure sensor checks complete, the sensor check is complete.
If the sensor checks have not completed, the ABS warning light will keep blinking while the vehicle is being driven, and the ABS will not operate.
Reading Sensor Check DTCs
Read the DTCs by following the GTS screen.
Note
If only DTCs other than Test Mode sensor check DTCs are output, repair the malfunction and clear the DTCs.
If Test Mode sensor check DTCs and other DTCs are output or if only Test Mode sensor check DTCs are output, repair the malfunction, clear the DTCs, and perform the Test Mode inspection again.
Tech Tips
See Sensor Check DTCs.
Turn the power switch off and disconnect the GTS.
Sensor Check DTCs
DTC No. | Detection Item | Trouble Area |
---|---|---|
C1271 | Low Output Signal of Front Speed Sensor RH |
|
C1272 | Low Output Signal of Front Speed Sensor LH |
|
C1273 | Low Output Signal of Rear Speed Sensor RH |
|
C1274 | Low Output Signal of Rear Speed Sensor LH |
|
C1275 | Abnormal Change in Output Signal of Front Speed Sensor RH |
|
C1276 | Abnormal Change in Output Signal of Front Speed Sensor LH |
|
C1277 | Abnormal Change in Output Signal of Rear Speed Sensor RH |
|
C1278 | Abnormal Change in Output Signal of Rear Speed Sensor LH |
|
C1279 | Abnormal Output Voltage in Deceleration Sensor |
|
C1281 | Abnormal Output in Master Cylinder Pressure Sensor |
|
DTC No. | Detection Item | Trouble Area |
---|---|---|
C1346 | Abnormal Learning of Stroke Sensor Zero Point |
|
Tech Tips
The codes in this table are output only in Test Mode (signal check).