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.
  • 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 ).
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

NG

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

OK

2.

CHECK DTC

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

Result

Result

Proceed to

DTC is not output

A

DTC is output

B

B

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

A

3.

CHECK HARNESS AND CONNECTOR (CSW TERMINAL)

NG

GO TO STEP 6

OK

4.

CHECK FOR DIFFERENTIAL SYSTEM

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

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(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

B

GO TO DIFFERENTIAL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART)

A

5.

PERFORM ACTIVE TEST USING TECHSTREAM (AUTO LSD INDICATOR LIGHT)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream 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

(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

-

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

OK

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

NG

REPLACE MASTER CYLINDER SOLENOID

6.

INSPECT VSC OFF SWITCH

NG

REPLACE VSC OFF SWITCH

OK

7.

INSPECT ROOF CONSOLE BOX ASSEMBLY

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

VSC OFF Indicator Light does not Come ON
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