Toyota Tacoma manuals

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

CAUTION / NOTICE / HINT

NOTICE:

When replacing the brake actuator assembly, perform calibration (See page PROCEDURE PROCEDURE ).

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: OK: ).

OK:

CAN Bus Check indicates no malfunctions in CAN communication.

NG

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

OK

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  ). ).

(c) Inspect the VSC OFF switch (See page OK: ).

OK:

The VSC OFF switch operates normally.

NG

REPLACE VSC OFF SWITCH

OK

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

OK

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 ). ABS/VSC/TRAC ).

ABS/VSC/TRAC

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 ...

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