Toyota Tacoma (2015-2018) Service Manual: Slip Indicator Light Remains ON

Toyota Tacoma (2015-2018) Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Slip Indicator Light Remains ON

DESCRIPTION

The slip indicator light blinks during VSC or TRAC and AUTO LSD operation. When the system fails, the slip indicator light comes on to warn the driver.

WIRING DIAGRAM

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 THAT SKID CONTROL ECU CONNECTOR SECURELY CONNECTED

(a) Check the skid control ECU (master cylinder solenoid) connector connection.

OK:

The connector is securely connected.

CONNECT CONNECTOR TO ECU CORRECTLY

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.	INSPECT BATTERY

(a) Inspect the battery voltage (See page Standard voltage: ).

Standard voltage:

11 to 14 V

CHECK CHARGING SYSTEM

4.	CHECK CAN COMMUNICATION SYSTEM

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(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.

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

5.	CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

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

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
S1-46 (IG1) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Skid Control ECU (Master Cylinder Solenoid))

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	CHECK HARNESS AND CONNECTOR (GND TERMINAL)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
S1-1 (GND1) - Body ground	Always	Below 1 Ω
S1-32 (GND2) - Body ground	Always	Below 1 Ω
S2-4 (GND3) - Body ground	Always	Below 1 Ω

Text in Illustration

*a	Front view of wire harness connector (to Skid Control ECU (Master Cylinder Solenoid))

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	READ VALUE USING TECHSTREAM (SLIP INDICATOR LIGHT)

(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: Chassis / ABS/VSC/TRAC / Data List.

(f) According to the display on the Techstream, read the Data List.

ABS/VSC/TRAC

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Slip Indicator Light	Slip indicator light/ ON or OFF	ON: Indicator light on OFF: Indicator light off	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Slip Indicator Light

Slip indicator light/ ON or OFF

ON: Indicator light on

OFF: Indicator light off

(g) Check the Techstream display condition of the slip Indicator light.

Result

Result	Proceed to
Display of the Data List remains OFF	A
Display of the Data List remains ON	B

GO TO METER / GAUGE SYSTEM

REPLACE MASTER CYLINDER SOLENOID

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