Toyota Tundra. Manual — part 938

HINT:

C0273/13: The skid control ECU begins to detect these DTCs when the vehicle speed exceeds 15 km/h (9 mph).

WIRING DIAGRAM

Fig. 69: Identifying ABS Motor Relay Circuit Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM

C0273/13

1. Pump motor voltage is 2.0 V

or more for 1 sec. or more at
motor relay OFF.

2. Pump motor voltage is (IG -

4.0 V) or less for 0.1 sec. or
more at motor relay ON.

3. After the end of the actuation

of the motor relay, slow
down condition of motor
does not meet the
specification.



ABS1 H-fuse



Harness or connector (+BM
circuit)



Skid Control ECU

NOTE:

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

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Turn the Techstream on.

d. Clear the DTC (See DTC CHECK/CLEAR ).

e. Select the Active Test mode on the Techstream.

ABS/VSC/TRAC

DIAGNOSTIC NOTE TABLE

f. Check the operation sound of the ABS motor when operating it with the Techstream.

OK: The operation sound of the ABS motor can be heard.

NG: Go to step 3

OK: Go To Next Step

2. RECONFIRM DTC

a. Clear the DTC (See DTC CHECK/CLEAR ).

b. Start the engine.

c. Check if the same DTC is output (See DTC CHECK/CLEAR ).

Result

RESULT TABLE

B: USE SIMULATION METHOD TO CHECK (See HOW TO PROCEED WITH
TROUBLESHOOTING )

A: REPLACE VSC ACTUATOR ASSEMBLY (See REMOVAL )

3. INSPECT FUSE (ABS1)

a. Remove the ABS1 H-fuse from the engine room relay block.

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

Standard Resistance

Tester Display

Test Part

Control Range

Diagnostic Note

Motor Relay

ABS motor relay

ON/OFF

Operating sound of
motor can be heard

Result

Proceed to

DTC is output

A

DTC is not output

B

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

TESTER CONNECTION SPECIFIED CONDITION TABLE

Fig. 70: Identifying ABS1 H-Fuse From Engine Room Relay Block
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO
FUSE AND REPLACE FUSE

OK: Go To Next Step

4. 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

Tester Connection

Condition

Specified Condition

ABS1 H-fuse

Always

Below 1 ohms

Tester Connection

Condition

Specified Condition

A17-16 (+BM) - Body ground

Always

11 to 14 V

Tester Connection

Condition

Specified Condition

A17-1 (GND1) - Body ground

Always

Below 1 ohms

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

Fig. 71: Identifying A17 Skid Control ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE VSC ACTUATOR ASSEMBLY (See REMOVAL )

DTC C1267/28: BRAKE PEDAL LOAD SENSING SWITCH

DESCRIPTION

The skid control ECU detects if the brake pedal is depressed.

DTC DETECTION CONDITION TABLE

WIRING DIAGRAM

DTC No.

DTC Detection Condition

Trouble Area

C1267/28

When one of following conditions
is met:

1. Micro switch signal PSNC

and PSNO logic malfunction.

2. When brake pedal is not

depressed, micro switch turns
on.

3. When brake pedal is

depressed, micro switch turns
off.



Booster pedal micro switch
(Active brake booster)



Booster pedal micro switch
(Active brake booster)
circuit

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra