Toyota Camry (XV70): 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:
After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and system information memorization.
Click here .gif)
PROCEDURE
| 1. |
BRAKE PROBLEM CHECK |
(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 | .gif) | END |
|
.gif)
| 2. |
CHECK DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Read the DTCs following the prompts on the Techstream. Enter the following menus: Chassis / Brake / Trouble Codes.
Chassis > Brake > Trouble Codes(d) Check the DTCs (vehicle stability control system) that are output.
| Result |
Proceed to |
|---|---|
| DTCs are not output. |
A |
| Vehicle stability control system DTCs are output. |
B |
| B |
| REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
|
|
| 3. |
CHECK VEHICLE |
(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 |
|
| 4. |
PERFORM DEALER MODE (SIGNAL CHECK) INSPECTION (SPEED SENSOR CHECK) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Enter the following menus: Chassis / Brake / Utility / Signal Check.
(d) Using the Techstream, perform a Dealer Mode (Signal Check) inspection sensor check and check that speed sensor Dealer Mode (Signal Check) inspection items change from incomplete to complete.
Click here
|
Tester Display |
|---|
| Signal Check |
OK:
Speed sensor Dealer Mode (Signal Check) inspection items change from incomplete to complete.
| NG | | INSPECT AND REPAIR MALFUNCTIONING SPEED SENSOR CIRCUIT |
|
| 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 Vehicle Control History (RoB) when the system operated.
Click here
- 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 |
READ NEXT:
Excessive Brake Pedal Travel (No Fluid Leaks and No Air in System)
CAUTION / NOTICE / HINT NOTICE: After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and system information memorization.
Click here
ABS Operates Before Necessary When Braking
DESCRIPTION Troubleshooting for when ABS operates too soon due to a noisy signal from the speed sensor, a difference in output, etc. CAUTION / NOTICE / HINT
NOTICE:
After replacing or removing a
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 malfunctio
SEE MORE:
Removal
REMOVAL PROCEDURE 1. PRECAUTION (w/o Navigation System)
NOTICE:
When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occurs:
A communication mal
If the vehicle becomes stuck
Carry out the following procedures if the tires spin or the vehicle
becomes stuck in mud, dirt or snow:
1. Stop the engine. Set the parking brake and shift the shift lever to P.
2. Remove the mud, snow or sand from around the front wheels.
3. Place wood, stones or some other material under the f
