Toyota Sequoia (2005). Manual - part 289

F16952

VYS

SS1

GYAW

S1

23

R

B

W

IM

BR

IL1

12

19

11

3

1

2

Y1
Yaw Rate (Deceleration)
Sensor

ABS & VSC Actuator
(Skid Control ECU)

(Shielded)

S1

S1

(Shielded)

VYS

YAW1

GYAW

R

B

W

SS2

S1

24

IL1

IL1

IL1

IL1

4

3

11

10

G

G

YAW2

5

(*)

(*)

(*) CAN2 Circuit

(*)

(*)

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–951

1145

DTC

C1232 / 32, C1244 / 44

Deceleration Sensor Circuit

CIRCUIT DESCRIPTION

The skid control ECU receives signals from the yaw rate sensor (deceleration sensor) via the CAN2 commu-
nication system.
The yaw rate sensor has a built–in deceleration sensor.
This sensor detects deceleration on the vehicle. The sensor signal is used in ABS & BA & TRAC & VSC
control.

DTC No.

DTC Detecting Condition

Trouble Area

C1232 / 32

When the lateral deceleration output becomes 4.8 V or

more or 0.2 V or less per 0.5 second.

Yaw rate (Deceleration) sensor

Yaw rate (Deceleration) sensor circuit

C1244 / 44

When any of the following conditions are detected:

1. When the supplied voltage to the yaw rate & decelera-

tion sensor becomes 18 V or more or 6.5 V or less.

2. When the longitudinal deceleration output becomes 4.8

V or more or 0.2 V or less per 0.5 second.

Yaw rate (Deceleration) sensor

Yaw rate (Deceleration) sensor circuit

WIRING DIAGRAM

DIDM8–01

F19784

Torque: 5 N·m (10 kgf·cm, 3.7ft·lbf)

F19199

DI–952

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1146

INSPECTION PROCEDURE

1

Check the yaw rate (deceleration) sensor installation.

CHECK:
Check the yaw rate (deceleration) sensor installation.
OK:

The sensor should be tightened to the specified
torque.
The sensor should not be tilted.

NG

Install yaw

 

rate (deceleration) sensor correctly.

OK

2

Check output value of the yaw rate sensor.

PREPARATION:
(a)

Remove the 2 bolts and the yaw rate (deceleration) sen-
sor assembly with the connector still connected.

(b)

Connect the hand–held tester to the DLC3.

(c)

Turn the ignition switch to the ON position and push the
hand–held tester main switch ON.

(d)

Select DATA LIST mode on the hand–held tester.

CHECK:
Check that the decelerate value of the deceleration sensor dis-
played on the hand–held tester changes: Place the decelera-
tion sensor vertically to the ground and turn the sensor to the
frontward and rearward.

Item

Measurement Item /

Range (Display)

Normal Condition

Diagnostic Note

DECELERAT SENS

Deceleration sensor 1
reading / min.: –1.869 G,
max.: 1.869 G

Approximately 0 

±

 0.13 G

while stationary

Reading changes when ve-
hicle is bounced

DECELERAT SENS2

Deceleration sensor 2
reading / min.: –1.869 G,
max.: 1.869 G

Approximately 0 

±

 0.13 G

while stationary

Reading changes when ve-
hicle is bounced

OK:

Decelerate value changes.

 

NG

Replace yaw rate (deceleration) sensor.

NOTICE:
When replacing the yaw rate (deceleration) sensor, per-
form the zero point calibration (See page 

DI–897

).

OK

F19145

Yaw Rate (Decel-
eration) Sensor

VYS

GYAW

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–953

1147

3

Check voltage between terminals VYS and GYAW of the yaw rate (deceleration)
sensor.

PREPARATION:
Disconnect the yaw rate (deceleration) sensor connecter.
CHECK:
(a)

Turn the ignition switch to the ON position.

(b)

Measure the voltage between terminals VYS and GYAW
of the yaw rate (deceleration) sensor harness side con-
nector.

OK:

Voltage: 10 to 14 V

OK

Check and replace yaw rate 

(deceleration)

sensor.

NOTICE:
When replacing the yaw rate sensor, perform the zero point
calibration (See page

 

DI–897

).

NG

4

Check for open and short circuit in harness and connector between yaw rate
sensor and skid control ECU (See page 

IN–35

).

NG

Repair or replace harness or connector.

OK

Replace skid control ECU
(See page 

BR–52

).

NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page 

DI–897

).

F16952

VYS

SS1

GYAW

S1

23

R

B

W

IM

BR

IL1

12

19

11

3

1

2

(Shielded)

S1

S1

(Shielded)

VYS

YAW1

GYAW

R

B

W

SS2

S1

24

IL1

IL1

IL1

IL1

4

3

11

10

G

G

YAW2

5

ABS & VSC Actuator
(Skid Control ECU)

Y1
Yaw Rate (Deceleration)
Sensor

(*)

(*)

(*) CAN2 Circuit

(*)

(*)

DI–954

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1148

DTC

C1234 / 34

Malfunction in Yaw Rate Sensor

CIRCUIT DESCRIPTION

Yaw rate sensor detects the vehicle’s sideslip and sends signals to the skid control ECU.

DTC No.

DTC Detecting Condition

Trouble Area

C1234 / 34

When any of the following conditions are detected:

1. Power output of 4.65 V or more or 0.25 or less continues

for 0.1 sec. or more.

Yaw rate (deceleration) sensor

C1234 / 34

for 0.1 sec. or more.

2. Difference between the actual output value of the yaw

rate sensor and the output value calculated from the

other sensor’s continues to be large.

Yaw rate (deceleration) sensor

Yaw rate (deceleration) sensor circuit

WIRING DIAGRAM

DIDM9–01