VSC does not Operate or VSC does not Operate Correctly
DESCRIPTION
When ABS, TRAC
or VSC is operating, the skid control ECU (brake booster with master
cylinder assembly) blinks the slip indicator light to inform the driver
that slippage occurred.
When a communication
malfunction with the hybrid vehicle control ECU is detected, TRAC and
VSC are disabled. Also, TRAC and VSC are disabled when a DTC is stored.
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 35 km/h (22 mph) or more.
OK:
The vehicle was not driven straight for a few seconds at 35 km/h (22 mph) or more.
HINT:
When
the power switch is turned on (IG), as steering angle sensor zero point
calibration is not performed below 35 km/h (22 mph), VSC will not
operate until the vehicle is driven straight for a few seconds at 35
km/h (22 mph) or more.
| OK |  |
END |
|
NG |
 | |
(a) Clear the DTCs.
Click here
Chassis > ABS/VSC/TRAC > Clear DTCs
(b) Turn the power switch off.
(c) Turn the power switch on (IG).
(d) Check the DTCs (electronically controlled brake system) that are output.
Click here
Chassis > ABS/VSC/TRAC > Trouble Codes
| Result |
Proceed to |
| DTCs are not output. |
A |
| Electronically controlled brake 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 ECU ASSEMBLY INSTALLATION |
(a) Turn the power switch off.
(b) Check that the yaw rate and acceleration sensor (airbag ECU assembly) has been installed properly.
Click here
OK:
The yaw rate and acceleration sensor (airbag ECU assembly) is tightened to the specified torque.
The yaw rate and acceleration sensor (airbag ECU assembly) is not tilted.
| OK |
| OBTAIN YAW RATE AND ACCELERATION SENSOR ZERO POINT |
| NG |
| INSTALL AIRBAG ECU ASSEMBLY CORRECTLY |
VSC OFF Switch Circuit
DESCRIPTION
The skid
control ECU (brake booster with master cylinder assembly) is connected
to the combination meter assembly via CAN communication.
Pressing
the VSC OFF switch turns off TRAC operation, and pressing and holding
this switch turns off TRAC and VSC operation. If TRAC and VSC operations
are turned off, the "Traction Control Turned Off" will be displayed on
the multi-information display and the VSC OFF indicator light will come
on.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
After
replacing the skid control ECU (brake booster with master cylinder
assembly), perform linear solenoid valve offset learning, ABS holding
solenoid valve learning, yaw rate and acceleration sensor zero point
calibration and system information memorization after performing "Reset
Memory".
Click here 
PROCEDURE
| 1. |
CHECK CAN COMMUNICATION SYSTEM |
(a) Check if CAN communication system DTCs are output.
Click here
|
Result | Proceed to |
|
DTCs are not output. |
A |
| DTCs are output. |
B |
| B |
 | INSPECT CAN COMMUNICATION SYSTEM |
|
A |
 | |
| 2. |
CHECK IF BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY CONNECTOR IS SECURELY CONNECTED |
(a) Check if the skid control ECU (brake booster with master cylinder assembly) connector is securely connected.
OK:
The connector is securely connected.
| NG |
| CONNECT CONNECTOR TO BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY CORRECTLY |
|
OK | |
| |
| 3. |
READ VALUE USING TECHSTREAM (TRAC/VSC OFF MODE) |
(a) Select the Data List on the Techstream.
Click here
Chassis > ABS/VSC/TRAC > Data List
|
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note |
|
TRAC/VSC Off Mode | TRAC/VSC off mode |
Normal, TRC OFF, VSC Expert Mode or VSC OFF |
Normal: Normal mode TRC OFF: TRAC off mode VSC Expert Mode: VSC expert mode
VSC OFF: VSC off mode |
- |
Chassis > ABS/VSC/TRAC > Data List
|
Tester Display |
| TRAC/VSC Off Mode |
(b) Check the indicator light and mode condition on the Techstream changes according to VSC OFF switch operation.
Standard:
|
Switch Operation | Mode Condition Display |
Multi-information Display (Traction Control Turned Off) |
VSC OFF Indicator Light |
|
Not pressed | Normal |
Not displayed | Does not come on |
|
Pressing the VSC OFF switch |
TRC OFF | Displayed |
Does not come on |
| Pressing and holding the VSC OFF switch |
VSC OFF | Displayed |
Comes on |
|
Result | Proceed to |
|
Indicator light and mode condition display do not change. |
A |
| Mode condition display is normal, but indicator light does not change. |
B |
| Indicator light and mode condition display are normal. |
C |
| B |
| INSPECT METER / GAUGE SYSTEM |
| C |
| USE SIMULATION METHOD TO CHECK |
|
A | |
| |
| 4. |
PERFORM ACTIVE TEST USING TECHSTREAM (MULTI-INFORMATION DISPLAY (TRACTION CONTROL TURNED OFF) AND VSC OFF INDICATOR LIGHT) |
(a) Select the Active Test on the Techstream.
Click here
Chassis > ABS/VSC/TRAC > Active Test
|
Tester Display | Measurement Item |
Control Range | Diagnostic Note |
|
TRC(TRAC) OFF Indicator Light |
Multi-information display (Traction Control Turned Off) |
Display ON/OFF | Observe combination meter assembly |
|
VSC OFF Indicator Light |
VSC OFF indicator light |
Indicator light ON/OFF |
Observe combination meter assembly |
Chassis > ABS/VSC/TRAC > Active Test
|
Tester Display |
| TRC(TRAC) OFF Indicator Light |
Chassis > ABS/VSC/TRAC > Active Test
|
Tester Display |
| VSC OFF Indicator Light |
(b)
Check the multi-information display (Traction Control Turned Off) and
VSC OFF indicator light on the combination meter assembly turn on or off
in accordance with Techstream operation.
OK:
The
multi-information display (Traction Control Turned Off) and VSC OFF
indicator light turn on or off in accordance with Techstream operation.
| NG |
| GO TO STEP 7 |
|
OK | |
| |
| 5. |
INSPECT VSC OFF SWITCH |
| (a) Turn the power switch off. |
 |
|
*a | Component without harness connected
(VSC OFF Switch) | | |
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(c) Disconnect the G26 VSC OFF switch connector.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|
5 (+) - 2 (E) | Switch pushed |
Below 1 Ω |
|
5 (+) - 2 (E) | Switch not pushed |
10 kΩ or higher |
| NG |
| REPLACE VSC OFF SWITCH |
|
OK | |
| |
| 6. |
CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - VSC OFF SWITCH) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(b) Disconnect the A35 skid control ECU (brake booster with master cylinder assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|
A35-18 (CSW) - G26-5 (+) |
Always | Below 1 Ω |
|
A35-18 (CSW) or G26-5 (+) - Body ground |
Always | 10 kΩ or higher |
|
G26-2 (E) - Body ground |
Always | Below 1 Ω |
| OK |
| REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 7. |
INSPECT COMBINATION METER ASSEMBLY |
(a) Perform the Active Test of the combination meter assembly (meter CPU) using the Techstream.
Click here
Body Electrical > Combination Meter > Active Test
|
Tester Display |
| Multi Display All (White) |
Body Electrical > Combination Meter > Active Test
|
Tester Display |
| VSC OFF Indicator |
(b) Check the combination meter assembly.
OK:
The multi-information display and VSC OFF indicator light turn on or off in accordance with Techstream operation.
| OK |
| REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY |
| NG |
| INSPECT METER / GAUGE SYSTEM |
