Toyota Sequoia (2005). Manual - part 291

F16988

GND

+BM

+BS

F16991

GND

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–959

1153

3

Check voltage of the +BM/+BS power source.

PREPARATION:
Disconnect the skid control ECU connector.
CHECK:
Measure the voltage between terminal +BM/+BS and GND of
the skid control ECU harness side connector.
OK:

Voltage: 10 to 14 V

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

).

NG

4

Check continuity between terminal GND of the skid control ECU connector and
body ground (See page 

IN–35

).

PREPARATION:
Disconnect the skid control ECU connector.
CHECK:
Measure the resistance between terminal GND of the skid con-
trol ECU harness side connector and body ground.
OK:

Resistance: 1 

Ω

 or less

NG

Repair or replace harness or connector.

OK

Check for open circuit in harness and connector between skid control ECU and battery 
(See page 

IN–35

).

F16976

ABS & VSC Actuator
(Skid Control ECU)

P20
Pedal Stroke Speed Sensor
(Delta S Sensor)

(Shielded)

Instrument Panel J/B

VCP

PIM

E3

S1

3

BR

J28
J/C

A

IE

VCP

1

S1

S1

8

14

PIM

E3

A

A

J8
J/C

W–B

W–B

1F

1K

12

9

5

3

G

Y

L

DI–960

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1154

DTC

C1247 / 47

Malfunction in Delta S Sensor

CIRCUIT DESCRIPTION

Detects a problem with booster negative pressure and enters assist control.

DTC No.

DTC Detecting Condition

Trouble Area

C1247 / 47

When any of the following conditions are detected:

1. When the output becomes 4.7 V or more or 0.2 V or less

per 100 msec.

2. When the output does not return to 2.5 V even when 500

msec. or more elapse, in spite of no change in brake

operation.

Brake booster

Delta S sensor (Pedal stroke speed sensor)

Delta S sensor (Pedal stroke speed sensor) circuit

Skid control ECU

WIRING DIAGRAM

DIDMB–01

F19800

(1): Brake Pedal 
Depressed
(2): Brake Pedal
Released

Voltage

Time

4.5 V

1.9 V

0.5 V

(2)

(1)

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–961

1155

INSPECTION PROCEDURE

HINT:
Start the inspection from step 1 in the case of using the hand–held tester and start from step 2 in the case
of not using the hand–held tester.

1

Check output value of the delta S sensor (pedal stroke speed sensor) using the
hand–held tester.

PREPARATION:
(a)

Connect the hand–held tester to the DLC3.

(b)

Turn the ignition switch to the ON position.

(c)

Run the engine until the engine speed reaches 3,000 rpm, and return it back to idle.

HINT:
Rev up the engine to ensure sufficient vacuum.
(d)

Select DATA LIST mode on the hand–held .

Item

Measurement Item /

Range (Display)

Normal Condition

Diagnostic Note

PEDAL STROKE

Pedal stroke sensor/
min.: 0 V, max.: 5.1 V

Approximately 2.0 V with-
out the brake pedal de-
pressed.

–

HINT:

The result appears on the tester after some delay because a time lag occurs in measurement with a
hand–held tester.

If a signal from the delta S sensor is sent between sampling, the result does not appear on the tester.
So be sure to perform the measurement 2 or 3 times.

CHECK:
Check that the brake pedal acceleration value of the delta S sensor displayed on the hand–held tester
changes, alternatively increasing the brake pedal stroke.

OK:

The value changes as shown in the illustration on the
left. (The value will return to approximately 2.0 V after
the brake pedal is released.)

HINT:
The maximum voltage depends on pedal stroke speed but
should not exceed 4.5 V or fall below 0.2 V.

OK

Replace skid control ECU
(See page 

BR–52

).

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

DI–897

).

NG

F19145

Delta S Sensor
(Pedal Stroke
Speed Sensor

VCP

DI–962

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1156

2

Check for open or short circuit in harness and connector between delta S sensor
(pedal stroke speed sensor) and skid control ECU (See page 

IN–35

).

NG

Repair or replace harness or connector.

OK

3

Inspect the delta S sensor (pedal stroke speed sensor ) terminal voltage (VCP
terminal)

PREPARATION:
Disconnect the delta S sensor (pedal stroke speed sensor) con-
nector.
CHECK:
(a)

Turn the ignition switch to the ON position.

(b)

Measure the voltage between VCP terminal and body
ground.

OK:

Voltage: 5 V

NG

Replace skid control ECU
(See page 

BR–52

).

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

DI–897

).

OK

Replace brake booster (See page 

BR–22

).