Toyota Tacoma (2015-2018) Service Manual: AUTO LSD Indicator Light does not Come ON
DESCRIPTION
The AUTO LSD does not operate even if the VSC OFF switch is pressed under the following conditions:
- The brake system is faulty.
- The temperature inside the hydraulic brake booster increases and the AUTO LSD operation is suspended.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When replacing the brake actuator assembly, perform calibration (See page
.gif)
).
PROCEDURE
|
1. |
CHECK CAN COMMUNICATION LINE |
(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 | .gif) |
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
|
.gif)
|
2. |
INSPECT VSC OFF SWITCH |
(a) Turn the ignition switch off.
(b) Remove the VSC OFF switch (See page ).
(c) Inspect the VSC OFF switch (See page ).
OK:
The VSC OFF switch operates normally.
| NG | |
REPLACE VSC OFF SWITCH |
|
|
3. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - VSC OFF SWITCH) |
(a) Disconnect the S1 skid control ECU (brake actuator assembly) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
S1-33 (CSW) - R44-16 |
Always |
Below 1 Ω |
|
S1-33 (CSW) or R44-16 -Body ground |
Always |
10 kΩ or higher |
|
R44-12 - Body ground |
Always |
Below 1 Ω |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
READ VALUE USING TECHSTREAM (AUTO LSD INDICATOR LIGHT) |
(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 |
|---|---|---|---|
|
Auto LSD Indicator Light |
Auto LSD indicator light/ ON or OFF |
ON: Indicator light on OFF: Indicator light off |
- |
(f) When performing the Auto LSD Indicator Light Active Test, check Auto LSD
Indicator Light in the Data List (See page
).
|
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Auto LSD Indicator Light |
Auto LSD indicator light |
Indicator light ON/OFF |
Observe the combination meter. |
|
Result |
Proceed to |
|
|---|---|---|
|
Data List Display |
Data List Display when Performing Active Test ON/OFF Operation |
|
|
ON |
Does not change between ON and OFF |
A |
|
Changes between ON and OFF |
B |
|
|
OFF |
Does not change between ON and OFF |
A |
|
Changes between ON and OFF |
B |
|
| A | |
REPLACE MASTER CYLINDER SOLENOID |
| B | |
GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
Slip Indicator Light Remains ON
DESCRIPTION
The skid control ECU (brake actuator assembly) is connected to the combination
meter assembly via CAN communication.
The slip indicator light blinks during VSC and/or TRAC operation.
...
AUTO LSD Indicator Light Remains ON
DESCRIPTION
During normal mode, pressing the VSC OFF switch for a short amount of time changes
vehicle to AUTO LSD mode.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When replacing the brak ...
Other materials:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use the following procedure to troubleshoot the power door lock control
system.
*: Use the Techstream.
PROCEDURE
1.
VEHICLE BROUGHT TO WORKSHOP
NEXT
...
Radar Cruise Control Presence Determination Malfunction (Engine / HV) (C1A52)
DESCRIPTION
DTC C1A52 is stored when the ECM cannot recognize the millimeter wave radar sensor
assembly.
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
C1A52
Radar Cruise Control Presence Determination Malfuncti ...
System Description
SYSTEM DESCRIPTION
1. CRUISE CONTROL SYSTEM
The cruise control system makes it possible to drive at a desired speed without
using the accelerator pedal. ECM controls the throttle opening angle based on signals
from switches and sensors.
The microcomputer which controls the cruise control syst ...
