TRAC does not Operate
DESCRIPTION
When TRAC or
VSC is operating, the skid control ECU (brake actuator assembly) blinks
the slip indicator light to inform the driver that slippage occurred.
When
in VSC off mode, or TRAC and VSC are disabled, the multi-information
display in the combination meter assembly displays "Traction Control
Turned Off" and the VSC OFF indicator light illuminates to inform the
driver.
When a communication malfunction with
the ECM is detected, TRAC and VSC are disabled. Also when the system is
malfunctioning, TRAC and VSC are disabled and the indicator lights of
related systems illuminate.
CAUTION / NOTICE / HINT
NOTICE:
When
replacing the skid control ECU (brake actuator assembly), perform
system variant learning and acceleration sensor zero point calibration.
Click here
PROCEDURE
(a) Check if the slip indicator light was illuminated when TRAC did not operate.
OK:
The slip indicator light was illuminated.
HINT:
When a DTC is stored, the slip indicator light is illuminated and TRAC does not operate due to the fail-safe function.
(b) Check the operation condition of the VSC OFF switch when TRAC did not operate.
OK:
The VSC OFF switch had been operated to turn off TRAC when TRAC did not operate.
HINT:
When
the multi-information display in the combination meter assembly
displays "Traction Control Turned Off", TRAC does not operate.
| OK |
 | END |
|
NG |
 | |
(a) Clear the DTCs.
Chassis > ABS/VSC/TRAC/EPB > Clear DTCs
(b) Turn the engine switch off.
(c) Turn the engine switch on (IG).
(d) Check the DTCs (vehicle stability control system) that are output.
Chassis > ABS/VSC/TRAC/EPB > Trouble Codes
| Result |
Proceed to |
| DTCs are not output |
A |
| Vehicle stability control system DTCs are output |
B |
| B |
| REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
|
A | |
| |
(a)
Operate the VSC OFF switch and check that the multi-information display
in the combination meter assembly displays "Traction Control Turned
Off" and the VSC OFF indicator light illuminates in accordance with the
operation of the switch.
OK:
The
multi-information display in the combination meter assembly displays
"Traction Control Turned Off" and the VSC OFF indicator light
illuminates in accordance with the operation of the switch.
| NG |
| INSPECT VSC OFF SWITCH CIRCUIT |
|
OK | |
| |
| 4. |
PERFORM TEST MODE (SIGNAL CHECK) INSPECTION (SPEED SENSOR CIRCUIT) |
(a) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Utility / Signal Check.
(b)
Using the Techstream, perform a Test Mode (Signal Check) inspection
sensor check and check that speed sensor Test Mode (Signal Check)
inspection items change from incomplete to complete.
Click here
Chassis > ABS/VSC/TRAC/EPB > Utility
|
Tester Display |
| Signal Check |
OK:
Speed sensor Test Mode (Signal Check) inspection items change from incomplete to complete.
| NG |
| INSPECT AND REPAIR MALFUNCTIONING SPEED SENSOR CIRCUIT |
|
OK | |
| |
| 5. |
PERFORM OPERATION CHECK DRIVING |
(a) Operate the VSC OFF switch and check that the system is not in TRAC off mode or VSC off mode.
(b) Check that no DTCs are output and that each warning light is not illuminated.
(c) Start off the vehicle on a low friction surface and check that TRAC operates when attempting to make the drive wheels slip.
OK:
TRAC operates when slip occurs when starting off.
NOTICE:
- Even when the system is normal, VSC may not operate when the vehicle
speed is low or TRAC may not operate due to a malfunction. Make sure
that only the drive wheels slip during the procedure.
- When confirming that the slip indicator light blinks, do not slip the
drive wheels longer than necessary. Whether TRAC operated or not can be
checked by reading the Freeze Frame Data when the system operated.
- Pay attention to your surroundings when performing the procedure and depress the accelerator pedal with caution.
| OK |
| USE SIMULATION METHOD TO CHECK |
| NG |
| REPLACE BRAKE ACTUATOR ASSEMBLY |
VSC does not Operate or VSC does not Operate Correctly
DESCRIPTION
When TRAC or
VSC is operating, the skid control ECU (brake actuator assembly) blinks
the slip indicator light to inform the driver that slippage occurred.
When
a communication malfunction with the ECM is detected, TRAC and VSC are
disabled. Also, TRAC and VSC are disabled when a DTC is stored.
CAUTION / NOTICE / HINT
NOTICE:
After
replacing or reinstalling the yaw rate and acceleration sensor (airbag
sensor assembly), perform system variant learning and acceleration
sensor zero point calibration.
Click here 
PROCEDURE
(a) Check whether the slip indicator light was illuminated when VSC did not operate.
OK:
The slip indicator light was illuminated.
HINT:
When a DTC is stored, the slip indicator light is illuminated and VSC does not operate due to the fail-safe function.
(b) Check whether the vehicle speed was 15 km/h (9 mph) or less when VSC did not operate.
OK:
The vehicle speed was 15 km/h (9 mph) or less.
HINT:
VSC does not operate when the vehicle speed is 15 km/h (9 mph) or less.
(c) Check whether the vehicle was driven straight for a few seconds at 15 km/h (9 mph) or more.
OK:
The vehicle was not driven straight for a few seconds at 15 km/h (9 mph) or more.
HINT:
When
the engine switch is turned on (IG), as steering angle sensor zero
point calibration is not performed below 15 km/h (9 mph), VSC will not
operate until the vehicle is driven straight for a few seconds at 15
km/h (9 mph) or more.
| OK |  |
END |
|
NG |
 | |
(a) Clear the DTCs.
Chassis > ABS/VSC/TRAC/EPB > Clear DTCs
(b) Turn the engine switch off.
(c) Turn the engine switch on (IG).
(d) Check the DTCs (vehicle stability control system) that are output.
Chassis > ABS/VSC/TRAC/EPB > Trouble Codes
| Result |
Proceed to |
| DTCs are not output |
A |
| Vehicle stability control system DTCs are output |
B |
| B |
| REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
|
A | |
| |
(a) Check that the tire of each wheel is the correct size.
Click here
OK:
The tire of each wheel is the correct size.
| NG |
| REPLACE THE TIRE OF EACH WHEEL WITH THE CORRECT SIZE |
|
OK | |
| |
| 4. |
CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION |
(a) Turn the engine switch off.
(b) Check that the yaw rate and acceleration sensor (airbag sensor assembly) has been installed properly.
Click here
OK:
The yaw rate and acceleration sensor (airbag sensor assembly) is tightened to the specified torque.
The yaw rate and acceleration sensor (airbag sensor assembly) is not installed in a tilted position.
| OK |
| OBTAIN YAW RATE AND ACCELERATION SENSOR ZERO POINT |
| NG |
| INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY |
