Toyota Tundra. Manual — part 366

Fig. 7: Identifying Waveform 1
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

f. Using an oscilloscope, check the waveform 2.

Waveform 2 (Reference);

ENGINE IMMOBILIZER SYSTEM WAVEFORM 2 REFERENCE

Fig. 8: Identifying Waveform 2
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2. CHECK TRANSPONDER KEY ECU

Fig. 9: Identifying Transponder Key ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Terminal No. (Symbols)

Tool Setting

Condition

J20-5 (TXCT) - J20-7 (AGND) 2 V/DIV., 20 msec./DIV. Key inserted in ignition key cylinder

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Engine Immobilizer - Tundra

a. Disconnect the J26 ECU connector.

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

TRANSPONDER KEY ECU TERMINALS RESISTANCE CHART DISCONNECT

If the result is not as specified, there may be a malfunction on the wire harness side.

c. Reconnect the J26 ECU connector.

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

TRANSPONDER KEY ECU TERMINALS RESISTANCE CHART RECONNECT

Terminal No.

(Symbols)

Wiring Color

Terminal

Description

Condition

Specified

Condition

J26-16(GND)-Body

ground

W-B - Body

ground

Ground

Always

Below 1 ohms

J26-1(+B) - J26-16

(GND)

G - W-B

Battery

Always

11 to 14 V

J26-2(IG) - J26-16

(GND)

GR - W-B

Ignition switch

Ignition switch OFF

Below 1 V

Ignition switch ON

11 to 14 V

J26-3(KSW) - J26-

16 (GND)

LG - W-B

Unlock warning

switch

No key in ignition key

cylinder

10 kohms or

higher

Key inserted in ignition

key cylinder

Below 1 ohms

Terminal No.

(Symbols)

Wiring

Color

Terminal Description

Condition

Specified Condition

J26-14(VC5) -
J26-16 (GND)

G - W-B

Power source

No key in ignition

key cylinder

Below 1 V

Key inserted in

ignition key

cylinder

4.6 to 5.4 V

J26-7(CTY) -

J26-16 (GND)

Y - W-B

Door courtesy

Door closed

10 kohms or higher

Door open

Below 1 ohms

J26-4(TXCT) -

J26-16 (GND)

L - W-B

Transponder key

amplifier communication

signal

No key in ignition

key cylinder

Below 1 V

Key inserted in

ignition key

cylinder

Pulse generation (see

step d, waveform 1)

J26-15(CODE) -

J26-16 (GND)

LG - W-

B

Transponder key

amplifier communication

signal

No key in ignition

key cylinder

Below 1 V

Key inserted in

ignition key

cylinder

Pulse generation (see

step e, waveform 2)

J26-13(EFIO) -

Y - W-B

ECM output signal

Ignition switch OFF

Below 1 V

Pulse generation (see

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Engine Immobilizer - Tundra

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

e. Using an oscilloscope, check the waveform 1.

Waveform 1 (Reference):

TRANSPONDER KEY ECU WAVEFORM 1 REFERENCE

Fig. 10: Identifying Waveform 1
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

f. Using an oscilloscope, check the waveform 2.

Waveform 2 (Reference):

TRANSPONDER KEY ECU WAVEFORM 2 REFERENCE

J26-16 (GND)

Ignition switch ON

step f, waveform 3)

J26-12(EFII) -
J26-16 (GND)

SB - W-

B

ECM input signal

Always

Pulse generation (see

step g, waveform 4)

J26-8(IND) -

J26-16 (GND)

V - W-B

Security indicator light

signal

Immobilizer set

status

Alternating between

11 to 14 V and below

1 V

Immobilizer unset

status

Below 1 V

J26-9(D) - J26-

16(GND)

L - W-B

Diagnosis tester

communication

Always

Pulse generation

Terminal No. (Symbols)

Tool Setting

Condition

J26-4(TXCT) - J26-16 (GND) 5 V/DIV., 20 msec./DIV. Key inserted in ignition key cylinder

Terminal No. (Symbols)

Tool Setting

Condition

J26-15(CODE) - J26-16 (GND) 5 V/DIV., 20 msec./DIV. Key inserted in ignition key cylinder

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Engine Immobilizer - Tundra

Fig. 11: Identifying Waveform 2
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

g. Using an oscilloscope, check the waveform 3.

Waveform 3 (Reference):

TRANSPONDER KEY ECU WAVEFORM 3 REFERENCE

Fig. 12: Identifying Waveform 3
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

h. Using an oscilloscope, check the waveform 4.

Waveform 4 (Reference):

TRANSPONDER KEY ECU WAVEFORM 4 REFERENCE

Terminal No. (Symbols)

Tool Setting

Condition

J26-13(EFIO) - J26-16 (GND) 10 V/DIV., 500 msec./ DIV. Ignition switch ON

Terminal No. (Symbols)

Tool Setting

Condition

J26-12(EFII) - J26-16 (GND) 12 V/DIV., 100 msec./ DIV. Always

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Engine Immobilizer - Tundra