DESCRIPTION
This is the A-TRAC main switch circuit. When the A-TRAC switch is turned on with the transfer in L4, the A-TRAC function is available and the A-TRAC indicator light illuminates.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CHECK CAN COMMUNICATION SYSTEM |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Select CAN Bus Check from the System Selection Menu screen and follow the
prompts on the screen to inspect the CAN bus (See page
).
OK:
CAN Bus Check indicates no malfunctions in CAN communication.
NG | ![]() |
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
|
2. |
CHECK HARNESS AND CONNECTOR (ATRC TERMINAL) |
(a) Disconnect the S1 skid control ECU (master cylinder solenoid) connector.
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
(c) Reconnect the S1 skid control ECU (master cylinder solenoid) connector.
NG | ![]() |
GO TO STEP 4 |
|
3. |
READ VALUE USING TECHSTREAM (A-TRC(TRAC) SWITCH) |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
ABS/VSC/TRAC
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
A-TRC(TRAC) Switch |
A-TRC Switch/ ON or OFF |
ON: A-TRC switch on OFF: A-TRC switch off |
- |
(f) Check that the mode display changes according to A-TRAC OFF switch operation.
OK:
Display changes according to switch operation.
A | ![]() |
GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
B | ![]() |
REPLACE MASTER CYLINDER SOLENOID |
4. |
INSPECT A-TRAC SWITCH |
(a) Remove the A-TRAC switch (See page ).
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
NG | ![]() |
REPLACE A-TRAC SWITCH |
|
5. |
INSPECT ROOF CONSOLE BOX ASSEMBLY |
(a) Remove the roof console box assembly.
*a |
Component without harness connected (Roof Console Box Assembly) |
- |
- |
(b) Measure the resistance according the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
R44-7 (ATRC) - 8 |
Always |
Below 1 Ω |
R44-12 (GND) - 5 |
Always |
Below 1 Ω |
Result |
Proceed to |
---|---|
OK |
A |
NG (for Double Cab) |
B |
NG (for Access Cab) |
C |
A | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR (MASTER CYLINDER SOLENOID - ROOF CONSOLE BOX ASSEMBLY) |
B | ![]() |
REPLACE ROOF CONSOLE BOX ASSEMBLY |
C | ![]() |
REPLACE ROOF CONSOLE BOX ASSEMBLY |
Diagnosis System
DIAGNOSIS SYSTEM
1. DESCRIPTION
The ECU stores trouble codes when malfunctions occur.
The diagnostic system allows for reading of the trouble codes from the DLC3.
Use the Techstream to help diagnose and repair the problem.
2. CHECK DLC3
(a) Check the DLC3 (See page ).
3. INSPECT BATTERY VOLT ...
Components
COMPONENTS
ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
...
Parts Location
PARTS LOCATION
ILLUSTRATION
*A
for Hydraulic Brake Booster
*B
for Vacuum Brake Booster
*C
for Automatic Transmission
*D
for Manual Transmission
*1
SKID CONTROL ECU (BRAKE ACT ...