Toyota Tundra. Manual — part 924

3. TEST MODE DTC OF ABS

DTC TABLE

U0124/69

Communication Circuit
Malfunction



Yaw rate and deceleration
sensor

U0126/63

Lost Communication with
Steering Angle Sensor Module



CAN communication system



Steering angle sensor

DTC Code

Detection Item

Trouble Areas

C1271/71

Low Output Signal of Front
Speed Sensor RH (Test Mode
DTC)



Front speed sensor



Front speed sensor circuit



Sensor installation



Foreign matter on sensor
rotor

C1272/72

Low Output Signal of Front
Speed Sensor LH (Test Mode
DTC)



Front speed sensor



Front speed sensor circuit



Sensor installation



Foreign matter on sensor
rotor

C1273/73

Low Output Signal of Rear Speed
Sensor RH (Test Mode DTC)



Rear speed sensor



Rear speed sensor circuit



Sensor installation



Foreign matter on sensor
rotor

C1274/74

Low Output Signal of Rear Speed
Sensor LH (Test Mode DTC)



Rear speed sensor



Rear speed sensor circuit



Sensor installation



Foreign matter on sensor
rotor

C1275/75

Abnormal Change in Output
Signal of Front Speed Sensor RH
(Test Mode DTC)



Front speed sensor (open)



Front speed sensor circuit
(open)

C1276/76

Abnormal Change in Output
Signal of Front Speed Sensor LH
(Test Mode DTC)



Front speed sensor (open)



Front speed sensor circuit
(open)

C1277/77

Abnormal Change in Output
Signal of Rear Speed Sensor RH
(Test Mode DTC)



Rear speed sensor (open)



Rear speed sensor circuit
(open)

Abnormal Change in Output



Rear speed sensor (open)

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

4. TEST MODE DTC OF VSC

DTC TABLE

DTC 43: ABS CONTROL SYSTEM MALFUNCTION

DESCRIPTION

This DTC is output when the VSC system detects a malfunction in the ABS control system.

DTC DETECTION CONDITION TABLE

INSPECTION PROCEDURE

1. CHECK ABS CONTROL SYSTEM

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

C1278/78

Signal of Rear Speed Sensor LH
(Test Mode DTC)



Rear speed sensor circuit
(open)

C1279/79

Deceleration Sensor Output
Voltage Malfunction (Test Mode
DTC)



Yaw rate and deceleration
sensor



Yaw rate sensor circuit



VSC actuator (skid control
ECU)

C1281/81

Master Cylinder Pressure Sensor
Output Malfunction (Test Mode
DTC)



Master cylinder brake fluid
pressure sensor



Master cylinder brake fluid
pressure sensor circuit



Stop light switch circuit



VSC actuator (skid control
ECU)

DTC Code

Detection Item

Trouble Areas

C0371/71

Yaw Rate Sensor (Test Mode
DTC)



Yaw rate and deceleration
sensor



Yaw rate and deceleration
sensor circuit



VSC actuator (skid control
ECU)

DTC Code

DTC Detection Condition

Trouble Area

43

Malfunction in ABS control system

ABS control system

NOTE:

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

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

b. Turn the ignition switch to ON.

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

Result

RESULT TABLE

B: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (ABS CONTROL SYSTEM) (See
DIAGNOSTIC TROUBLE CODE TABLE )

A: Go to next step

2. CONFIRM DTC

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

b. Turn the ignition switch to ON.

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

Result

RESULT TABLE

B: REPLACE VSC ACTUATOR ASSEMBLY (See REMOVAL )

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

DTC C0200/31, C0205/32, C1271/71, C1272/72, C1275/75, C1276/76, C1330/35, C1331/36: RIGHT
FRONT WHEEL SPEED SENSOR SIGNAL; LEFT FRONT WHEEL SPEED SENSOR SIGNAL;
LOW OUTPUT SIGNAL OF FRONT SPEED SENSOR RH (TEST MODE DTC); LOW OUTPUT
SIGNAL OF FRONT SPEED SENSOR LH (TEST MODE DTC); ABNORMAL CHANGE IN OUTPUT
SIGNAL OF FRONT SPEED SENSOR RH (TEST MODE DTC); ABNORMAL CHANGE IN OUTPUT
SIGNAL OF FRONT SPEED SENSOR LH (TEST MODE DTC); OPEN CIRCUIT IN RIGHT FRONT
WHEEL SPEED SENSOR CIRCUIT; OPEN CIRCUIT IN LEFT FRONT WHEEL SPEED SENSOR
CIRCUIT

DESCRIPTION

The speed sensors detect the wheel speeds and send appropriate signals to the skid control ECU. Speed sensor
rotors have rows of alternating N and S magnetic poles, and their magnetic fields change as the rotors turn.

Result

Proceed to

DTC (ABS control system DTC) is not output

A

DTC (ABS control system DTC) is output

B

Result

Proceed to

DTC (43) is not output

A

DTC (43) is output

B

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

The speed sensors detect those magnetic changes and send pulse signals to the skid control ECU. The ECU
monitors the wheel speeds through these pulse signals to control the ABS control system.

Fig. 35: Identifying Front Speed Sensor - Blinking Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DTC DETECTION CONDITION TABLE

DTC Code

DTC Detection Condition

Trouble Area

C0200/31
C0205/32

When any of following conditions
detected:

1. When vehicle speed 15 km/h

(9 mph), wheel speed 6 km/h
(4 mph) or less.

2. At vehicle speed of 45 km/h

(28 mph) or more, open in
sensor harness occurs
intermittently for 0.2 seconds
or more.

3. When vehicle speed between

10 km/h (6 mph) and 15
km/h (9 mph) for 3 minutes,
one wheel speed 0 km/h (0
mph).

4. Pressure reduction mode of

ABS system lasts for 28
seconds or more.

5. When vehicle driven at speed

of 20 km/h (12 mph) or
more, difference between
wheel speeds indicated by
two sensors twice or more
for 30 seconds or more.

6. Foreign matter adheres to



Front speed sensor



Front speed sensor circuit



Sensor installation



Foreign matter on sensor
rotor

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra