Toyota Tundra. Manual — part 2765

PROBLEM SYMPTOMS TABLE

HINT:



Use the table below to help determine the cause of the problem symptom. The potential causes of the
symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each
symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.



Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Tire Pressure Warning System

SYMPTOM TABLE

C2183/83

Transmitter ID3 not

received

transmitter



Tire pressure
warning
antenna and
receiver



Wire harness
or connector



Tire pressure
warning ECU

C2184/84

Transmitter ID4 not

received



Tire pressure
warning valve
and
transmitter



Tire pressure
warning
antenna and
receiver



Wire harness
or connector



Tire pressure
warning ECU

C2191/91

Vehicle speed

signal error



Combination
meter



Wire harness
or connector



Vehicle speed
signal circuit



Tire pressure
warning ECU

Symptom

Suspected Area

Reference

2009 Toyota Tundra

2009 SUSPENSION Tire & Wheel - Tundra

TERMINALS OF ECU

HINT:

Inspect the connectors from the back side.

1. CHECK TIRE PRESSURE WARNING ECU

Fig. 14: Identifying Tire Pressure Warning ECU Connector Terminals J31
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Disconnect the P17 tire pressure warning antenna and receiver connector.

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

CONNECTOR TERMINALS REFERENCE TABLE

Tire pressure warning light does
not illuminate despite tire pressure
decreasing

Check Data List (Tire inflation
pressure)

DATA LIST/ACTIVE TEST

ID code check (Registration)

REGISTRATION

Initialization

INITIALIZATION

Tire pressure warning light
remains illuminated (goes off
during initial check).

Tire Pressure Warning Light
Circuit

TIRE PRESSURE WARNING

LIGHT CIRCUIT

ECU Power Source Circuit

ECU POWER SOURCE

CIRCUIT

Tire pressure warning light
remains illuminated (comes on
during initial check).

Check Data List (Tire inflation
pressure)

DATA LIST/ACTIVE TEST

Tire pressure adjustment

TIRE PRESSURE WARNING

SYSTEM

ID code check (Registration)

REGISTRATION

Initialization

INITIALIZATION

Initialization cannot be done

Tire Pressure Warning Reset
Switch Circuit

TIRE PRESSURE WARNING

RESET SWITCH CIRCUIT

DTC check cannot be done

TC and CG Terminal Circuit

TC AND CG TERMINAL

CIRCUIT

ECU Power Source Circuit

ECU POWER SOURCE

CIRCUIT

Terminal No.

(Symbols)

Wiring

Color

Terminal Description

Condition

Specified

Condition

2009 Toyota Tundra

2009 SUSPENSION Tire & Wheel - Tundra

c. Connect the P17 tire pressure warning antenna and receiver connector.

d. Measure the voltage and resistance according to the value(s) in the table below.

VOLTAGE AND RESISTANCE SPECIFICATION TABLE

If the result is not as specified, the ECU may have a malfunction.

e. Using an oscilloscope, check the waveform 1.

J31-12 (RDA) - J31-

9 (GND)

G - W-B

Tire pressure warning antenna
and receiver signal

Ignition switch
ON

11 to 14 V

Terminal No.

(Symbols)

Wiring

Color

Terminal Description

Condition

Specified

Condition

J31-1 (CLSW)
- J31-9 (GND)

B - W-B

Tire pressure warning
reset switch

Ignition switch ON Tire
pressure warning reset switch
OFF

8 to 14 V

Ignition switch ON Tire

pressure warning reset switch

ON

Below 1.5 V

J31-2 (SPD) -
J31-9 (GND)

V - W-B Vehicle speed signal

Vehicle is running

Pulse

generation (See

d waveform 1)

J31-3 (TC) -
J31-9 (GND)

W - W-B TC terminal

When terminal TC is not
connected

8 to 14 V

J31-5 (IND) -
J31-9 (GND)

LG - W-

B

Tire pressure warning
light output signal

After ignition switch is turned
ON, when tire pressure
warning light illuminates for 3
seconds

2.2 to 4.4 V

Ignition switch ON Tire

pressure warning light off

Below 0.5 V

J31-6 (RF5V)
- J31-9 (GND)

Y - W-B

Tire pressure warning
antenna and receiver
power source

Ignition switch ON

11 to 14 V

J31-7 (IG) -
J31-9 (GND)

Y - W-B IG power source

Ignition switch ON

11 to 14 V

J31-9 (GND) -
Body ground

W-B -

Body

ground

Ground

Always

Below 1 ohms

J31-10 (SIL) -
J31-9 (GND)

L - W-B

Diagnosis tester
communication line

Ignition switch ON, when
communication is not
performed with a tester

8 to 14 V

J31-11
(GND2) - J31-
9 (GND)

P - W-B

Tire pressure warning
antenna and receiver
ground

Always

Below 1 ohms

2009 Toyota Tundra

2009 SUSPENSION Tire & Wheel - Tundra

WAVEFORM REFERENCE TABLE

Fig. 15: Waveform Graph 1
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DIAGNOSIS SYSTEM

1. CHECK BATTERY VOLTAGE

Standard battery voltage: 11 to 14 V

If the voltage is below 11 V, recharge the battery before proceeding.

2. DIAGNOSIS SYSTEM

a. Warning light

1. When there is a problem with the tire pressure warning system, the tire pressure warning

light blinks at 0.5 second intervals, and turns on after 1 minute.

b. DTCs (Normal mode)

1. DTCs are stored in the tire pressure warning ECU and output by the blinks of the tire

pressure warning light or by using the Techstream (See DTC CHECK/CLEAR ).

c. Test mode

1. By switching from normal mode into test mode (input signal check), you can inspect the tire

pressure warning antenna and receiver, each tire pressure warning valve and transmitter, and
the vehicle speed sensor can be inspected (See TEST MODE PROCEDURE ).

Item

Contents

Terminal No. (Symbols) J31-2 (SPD) - J31-9 (GND)
Tool Setting

5 V/DIV., 200 ms/DIV.

Vehicle Condition

While driving at approximately 20 km/h (12 mph).

2009 Toyota Tundra

2009 SUSPENSION Tire & Wheel - Tundra