Toyota Tacoma (2015-2018) Service Manual: AUTO LSD Indicator Light does not Come ON

Toyota Tacoma (2015-2018) Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / 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.
The rear differential is locked.

WIRING DIAGRAM

Refer to AUTO LSD Indicator Light Remains ON (See page CAUTION / NOTICE / HINT ).

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (master cylinder solenoid), perform calibration (See page ).
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	CHECK CAN COMMUNICATION SYSTEM

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

CHECK DTC

(a) Check for DTCs (See page Result ).

Result

Result	Proceed to
DTC is not output	A
DTC is output	B

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

3.	CHECK HARNESS AND CONNECTOR (CSW TERMINAL)

GO TO STEP 6

4.	CHECK FOR DIFFERENTIAL SYSTEM

(a) Reconnect the S1 skid control ECU (master cylinder solenoid) connector.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Four Wheel Drive / Trouble Codes.

(f) Check for DTCs.

Result

Result	Proceed to
DTCs are not output	A
DTCs are output	B

GO TO DIFFERENTIAL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART)

5.	PERFORM ACTIVE TEST USING TECHSTREAM (AUTO LSD INDICATOR LIGHT)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test.

(e) According to the display on the Techstream, perform the Active Test.

ABS/VSC/TRAC

Tester Display	Test Part	Control Range	Diagnostic Note
Auto LSD Indicator Light	Auto LSD indicator light	Indicator light OFF/ON	Observe the combination meter. [Vehicle condition] Vehicle stopped

Tester Display

Test Part

Control Range

Diagnostic Note

Auto LSD Indicator Light

Auto LSD indicator light

Indicator light OFF/ON

Observe the combination meter.

[Vehicle condition]

Vehicle stopped

(f) When performing the ABS Warning Light Active Test, check ABS Warning Light in the 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	-

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

Result

Result	Proceed to
Auto LSD Indicator Light in the Data List does not change using the Active Test	A
Auto LSD Indicator Light in the Data List turns ON/OFF using the Active Test	B

GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

REPLACE MASTER CYLINDER SOLENOID

6.	INSPECT VSC OFF SWITCH

REPLACE VSC OFF SWITCH

7.	INSPECT ROOF CONSOLE BOX ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (MASTER CYLINDER SOLENOID - ROOF CONSOLE BOX ASSEMBLY)

REPLACE ROOF CONSOLE BOX ASSEMBLY

VSC OFF Indicator Light does not Come ON

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Unusual Bank Angle Detected (C1440)
DESCRIPTION If the skid control ECU (brake actuator assembly) determines that the vehicle is being driven at a steep bank angle, the skid control ECU (brake actuator assembly) stores DTC C1440 while VSC operation is temporarily disabled. This is not a malfunction if the system and sensor circu ...