DESCRIPTION For 2WD vehicles and 4WD vehicles in 2H mode:
- When the VSC OFF switch (traction control switch) is pressed for a short
amount of time (approximately 1 second), the AUTO LSD indicator light
illuminates.
- When the vehicle is stopped and the VSC OFF switch (traction control
switch) is pressed for 3 seconds or more, the AUTO LSD indicator light
and VSC OFF indicator light illuminate.
- When in AUTO LSD mode, the vehicle is stopped and the VSC OFF switch
(traction control switch) is pressed for 3 seconds or more, the VSC and
TRAC functions turn off, the AUTO LSD indicator light turns off and the
TRAC OFF indicator light and VSC OFF indicator light illuminate.
4WD vehicles in 4H mode:
- When in 4H mode, the TRAC OFF and VSC OFF indicator light turn off.
- When the VSC OFF switch (traction control switch) is pressed for a short
amount of time (approximately 1 second), the TRAC function turns off
and the TRAC OFF indicator light illuminates.
- When the vehicle is stopped and the VSC OFF switch (traction control
switch) is pressed for 3 seconds or more with the TRAC OFF function
turned off, the VSC and TRAC functions turn off, and the TRAC OFF
indicator light and VSC OFF indicator light illuminate.
4WD Vehicles in 4L mode:
- When the vehicle is in 4L mode, the TRAC OFF and AUTO LSD indicator
lights turn off and the VSC OFF indicator light illuminates.When the
vehicle is stopped and the VSC OFF switch (traction control switch) is
pressed for 3 seconds or more, the VSC and TRAC functions turn off and
the TRAC OFF indicator light and VSC OFF indicator light illuminate.
WIRING DIAGRAM
 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
| 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 ACTUATOR ASSEMBLY CONNECTOR IS SECURELY CONNECTED |
(a) Check if the skid control ECU (brake actuator assembly) connector is securely connected.
OK: The connector is securely connected.
| NG |
| CONNECT CONNECTOR TO BRAKE ACTUATOR ASSEMBLY CORRECTLY |
|
OK | |
| |
| 3. |
READ VALUE USING TECHSTREAM (TRAC/VSC OFF MODE) |
(a) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List. ABS/VSC/TRAC |
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note | |
TRAC/VSC Off Mode | TRAC/VSC off mode |
Normal, TRC OFF or VSC OFF |
Normal: Normal mode TRC OFF: TRAC off mode VSC OFF: VSC off mode |
- | (b) for 4WD vehicles: Set to H2 mode.
(c)
Check the indicator light and mode condition on the Techstream changes
according to VSC OFF switch (traction control switch) operation. Standard: |
Switch Operation | Control Mode |
Mode Condition Display of Techstream |
TRAC OFF Indicator Light | AUTO LSD Indicator Light |
VSC OFF Indicator Light | |
Not pressed | Normal mode |
Normal | Does not come on |
Does not come on | Does not come on | |
VSC OFF switch (traction control switch) is pressed for a short amount of time |
TRAC OFF mode | TRAC OFF |
Does not come on | Comes on |
Does not come on | |
the vehicle is stopped and the VSC OFF switch (traction control switch) is pressed for 3 seconds or more |
AUTO LSD mode | Normal |
Does not come on | Comes on |
Comes on | | While
the AUTO LSD function is operating, the vehicle is stopped and the VSC
OFF switch (traction control switch) is pressed for 3 seconds or more |
VSC OFF mode | VSC OFF |
Comes on | Does not come on |
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 (TRAC OFF AND VSC OFF INDICATOR LIGHTS) |
(a) Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test. ABS/VSC/TRAC |
Tester Display | Measurement Item |
Control Range | Diagnostic Note | |
TRC(TRAC) OFF Indicator Light |
TRAC OFF indicator light |
Indicator light OFF/ON |
Observe combination meter assembly | |
VSC OFF Indicator Light |
VSC OFF indicator light |
Indicator light OFF/ON |
Observe combination meter assembly |
(b)
Check that the TRAC OFF and VSC OFF indicator lights on the combination
meter assembly turn on or off in accordance with the operation of the
Techstream. OK: The TRAC OFF and VSC OFF indicator lights turn on or off in accordance with the operation of the Techstream.
| NG |
| GO TO STEP 7 |
|
OK | |
| |
| 5. |
INSPECT TRACTION CONTROL SWITCH | (a) Turn the ignition switch off.
(b) Remove the VSC OFF switch (traction control switch). Click here
| NG | |
REPLACE TRACTION CONTROL SWITCH |
|
OK | |
| |
| 6. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - TRACTION CONTROL 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 A57 skid control ECU (brake actuator 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 | |
A57-20 (CSW) - J22-9 |
Always | Below 1 Ω | |
A57-20 (CSW) or J22-9 - Body ground |
Always | 10 kΩ or higher | |
J22-6 - Body ground | Always |
Below 1 Ω |
| OK |
| REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 7. |
INSPECT COMBINATION METER ASSEMBLY | (a) Enter the following menus: Body Electrical / Combination Meter / Active Test.
Click here (b) Perform the Active Test of the combination meter assembly using the Techstream.
(c) Check the combination meter assembly. OK: The TRAC OFF, VSC OFF and AUTO LSD indicator light turn on or off in accordance with the Techstream operation.
| OK |
| REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG |
| INSPECT METER / GAUGE SYSTEM | | 
