Toyota Tundra. Manual — part 946

RESULT TABLE

B: GO TO CAN COMMUNICATION SYSTEM (See HOW TO PROCEED WITH
TROUBLESHOOTING )

A: Go To Next Step

2. INSPECT CONNECTOR CONNECTION CONDITION

a. Check the skid control ECU connector connection condition.

OK: The connector is securely connected.

NG: CONNECT CONNECTOR CORRECTLY

OK: Go To Next Step

3. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BATTERY AND BODY

GROUND)

a. Disconnect the A17 ECU connector.

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

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION TABLE

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Result

Proceed to

DTC is not output

A

DTC is output

B

Tester Connection

Switch Condition

Specified Condition

A17-9 (IG1) - Body ground

Ignition switch ON

11 to 14 V

Tester Connection

Condition

Specified Condition

A17-1 (GND-I) - Body ground

Always

Below 1 ohms

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

Fig. 90: Identifying A17 Skid Control ECU Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go To Next Step

4. PERFORM ACTIVE TEST USING TECHSTREAM (ABS WARNING LIGHT)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Turn the Techstream on.

d. Select the Active Test mode and operate the ABS warning light using the Techstream.

ABS/VSC/TRAC

TESTER CONNECTION SPECIFIED CONDITION TABLE

e. Check that the ABS warning light turns on and off in the combination meter when using the

Techstream.

OK: The ABS warning light turns on and off in accordance with the Techstream operation.

HINT:

When the ABS warning light remains illuminated, there may be an open in the wire harness of the
combination meter or abnormalities in the meter circuit.

NG: GO TO METER/GAUGE SYSTEM (See HOW TO PROCEED WITH

Tester Display

Test Part

Control Range

Diagnostic Note

ABS Warning Light

ABS warning light

ON/OFF

Observe combination

meter

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

TROUBLESHOOTING )

OK: REPLACE VSC ACTUATOR ASSEMBLY (See REMOVAL )

ABS WARNING LIGHT DOES NOT COME ON

WIRING DIAGRAM

Refer to WIRING DIAGRAM .

INSPECTION PROCEDURE

1. INSPECT CAN COMMUNICATION SYSTEM

a. Check if a CAN communication system DTC is output (See DIAGNOSTIC TROUBLE CODE

TABLE ).

Result

RESULT TABLE

B: GO TO CAN COMMUNICATION SYSTEM (See HOW TO PROCEED WITH
TROUBLESHOOTING )

A: Go To Next Step

2. PERFORM ACTIVE TEST USING TECHSTREAM (ABS WARNING LIGHT)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Turn the Techstream on.

d. Select the Active Test mode and operate the ABS warning light using the Techstream.

ABS/VSC/TRAC

DIAGNOSTIC NOTE TABLE

e. Check that the ABS warning light turns on and off in the combination meter when using the

NOTE:

When replacing the VSC actuator assembly, perform zero point calibration (See
CALIBRATION ).

Result

Proceed to

DTC is not output

A

DTC is output

B

Tester Display

Test Part

Control Range

Diagnostic Note

ABS Warning Light

ABS warning light

ON/OFF

Observe combination

meter

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

Techstream.

OK: The ABS warning light turns on and off in accordance with the Techstream operation.

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

OK: REPLACE VSC ACTUATOR ASSEMBLY (See REMOVAL )

BRAKE WARNING LIGHT REMAINS ON

DESCRIPTION

If any of the following conditions are detected, the BRAKE warning light remains on:

1. The ECU connectors are disconnected from the skid control ECU.

2. The brake fluid level is insufficient.

3. The parking brake is applied.

4. The EBD system is malfunctioning.

5. The booster vacuum is malfunctioning.

6. The pedal stroke sensor is malfunctioning.

7. The pump is malfunctioning.

WIRING DIAGRAM

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra