Toyota Sequoia (2005). Manual - part 269

F19136

Tire Pressure Monitor ECU:

T17

SPD

F19755

C5–20

Combination 
Meter

C5

–

DIAGNOSTICS

TIRE PRESSURE WARNING SYSTEM

DI–871

1065

INSPECTION PROCEDURE

NOTICE:
It is necessary to register an ID code after replacing the tire pressure monitor valve sub–assy and/or
the tire pressure monitor ECU (see page 

DI–805

).

HINT:
When not using the hand–held tester, go to step 2.

1

Read value on hand–held tester.

PREPARATION:
(a)

Connect the hand–held tester to the DLC3.

(b)

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

(c)

Select the item below in the DATA LIST, and read its value displayed on the hand–held tester.

TIRE PRESSURE:

Item

Normal Condition

VEHICLE SPEED

Actual vehicle speed

CHECK:
Check that the values indicated on the tester and the combination meter are the same.
OK:

Indicates actual speed.

OK

Replace tire pressure monitor ECU
(See page 

SA–20

).

NG

2

Check harness and connector (Tire pressure monitor ECU – Combination meter
assy).

PREPARATION:
Disconnect the combination meter assy C5 connector and tire
pressure monitor ECU T17 connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Specified Condition

T17–3 (SPD) – C5–20

Below 1 

Ω

T17–3 (SPD) – Body ground

10 k

Ω

 or higher

F19138

Tire Pressure Monitor ECU:

SPD

GND

T17

9 to 14 V

0

Turn the wheel

DI–872

–

DIAGNOSTICS

TIRE PRESSURE WARNING SYSTEM

1066

NG

Repair or replace harness or connector.

OK

3

Inspect tire pressure monitor ECU.

PREPARATION:
Remove the tire pressure monitor ECU with connectors still
connected.
CHECK:
Check voltage.

(1)

Shift the shift lever to neutral.

(2)

Jack up one of the front wheels.

(3)

Turn the ignition switch to the ON position.

(4)

Measure the voltage between terminals SPD and
GND of the tire pressure monitor ECU when the
front wheel is turned slowly.

OK:

Voltage is generated intermittently.

HINT:
As the vehicle speed (wheel revolution speed) increases, a
cycle of the waveform narrows.

NG

Check combination meter assy (Speed signal
circuit) (See page 

SA–20

).

OK

Replace tire pressure monitor ECU
(See page 

SA–20

).

F19174

Combination Meter

Tire Pressure
Monitor ECU

Engine Room J/B

I18
Ignition SW

IGN1

B–O

IG2

AM2

1C

11

Battery

2

1H

T17

C5

GR–L

Tire Pressure

B–R

B

5

6

5

4

AM2

24

6

IND

Instrument Panel J/B

C6

20

2D

1

2C

1

1C

3

1J

7

F10
Fusible Link Block

Instrument Panel J/B

W–R

W–R

B

–

DIAGNOSTICS

TIRE PRESSURE WARNING SYSTEM

DI–873

1067

Tire Pressure Warning Lamp Circuit

CIRCUIT DESCRIPTION

If the ECU detects trouble, the tire pressure warning lamp comes on and tire pressure monitor is cancelled
at the same time. At this time, the ECU records a DTC in memory.
Connect terminals Tc and CG of the DLC3 to make the tire pressure warning lamp blink and output the DTC.

WIRING DIAGRAM

DIDKF–01

F19136

Tire Pressure Monitor ECU:

T17

IND

F19755

C5–20

Combination 
Meter

C5

DI–874

–

DIAGNOSTICS

TIRE PRESSURE WARNING SYSTEM

1068

INSPECTION PROCEDURE

NOTICE:
It is necessary to register an ID code after replacing the tire pressure monitor valve sub–assy and/or
the tire pressure monitor ECU (see page 

DI–805

).

HINT:
This procedure must be performed according to the PROBLEM SYMPTOMS TABLE.

1

Check harness and connector (Tire pressure monitor ECU – Combination meter
assy).

PREPARATION:
Disconnect the tire pressure monitor ECU T17 connector and
C5 combination meter.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Specified Condition

T17–6 (IND) – C5–20

Below 1 

Ω

T17–6 (IND) – Body ground

10 k

Ω

 or higher

NG

Repair or replace harness or connector

 

(Com-

bination meter to tire pressure monitor ECU).

OK

Proceed to next circuit inspection shown in problem symptoms table (See page 

DI–814

).