Toyota Tundra. Manual — part 365

a. After replacing the transponder key ECU

1. Register the key code(s) by following the new key code registration procedure (procedure

"B").

2. Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3 before inserting the key into

the key cylinder.

Fig. 5: Identifying DLC3 Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

SST 09843-18040

ECU - ECM COMMUNICATION ID REGISTRATION (PROCEDURE "C")
PROCEDURE CHART

NOTE:



The ECU - ECM communication ID must be registered to the
transponder key ECU and ECM when one of the following occurs in
order to match their IDs: 1) the transponder key ECU is replaced, 2)
the ECM is replaced, or 3) the transponder key ECU and ECM are
replaced.



The SFI system cannot be started unless the ECU - ECM
communication IDs of the transponder key ECU and ECM match.

Procedure

Security Indicator Light

Condition

1. Insert previously registered key into ignition key cylinder
and turn ignition switch ON.
HINT:
Do not start the engine.

Security indicator light
turned off.

2. Leave vehicle as is for 30 min.
3. Turn the ignition switch OFF and disconnect terminals TC
and CG.
4. Start engine.
5. Check that engine starts and stays on for more than 3 SEC.
Registration is complete.

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Engine Immobilizer - Tundra

b. After replacing the ECM

1. Register the ECU - ECM communication ID.

ECU - ECM COMMUNICATION ID REGISTRATION (PROCEDURE "C")
PROCEDURE CHART

c. After replacing the transponder key ECU and ECM

1. Register the key code(s) by following the new key code registration procedure (procedure

"B").

2. Register the ECU - ECM communication ID.

ECU - ECM COMMUNICATION ID REGISTRATION (PROCEDURE "C")
PROCEDURE CHART

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.

Engine immobilizer system

ENGINE IMMOBILIZER SYSTEM PROBLEM SYMPTOMS CHART

Procedure

Security Indicator Light

Condition

1. Insert previously registered key into ignition key cylinder.

Security indicator light
turned off.

2. Start engine.
3. Check that engine starts and stays on for more than 3 SEC.
Registration is complete.

Procedure

Security Indicator Light

Condition

1. Insert previously registered key into ignition key cylinder.

Security indicator light
turned off.

2. Start engine.
3. Check that engine starts and stays on for more than 3 SEC.
Registration is complete.

Symptom

Suspected Area

Refer To

Engine does not start

Ignition switch (for 2UZ-FE)

INSPECTION

Ignition switch (for 3UR-FE)

INSPECTION

ECU power source circuit

ECU POWER SOURCE

CIRCUIT

Transponder key ECU

-

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Engine Immobilizer - Tundra

TERMINALS OF ECU

1. CHECK TRANSPONDER KEY AMPLIFIER

Fig. 6: Identifying Transponder Key Amplifier ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

SFI system (for 2U2-FE)

HOW TO PROCEED WITH

TROUBLESHOOTING

SFI system (for 3UR-FE)

HOW TO PROCEED WITH

TROUBLESHOOTING

Security indicator light
malfunction

Security indicator light circuit

SECURITY INDICATOR

LIGHT CIRCUIT

Ignition switch (for 2UZ-FE)

INSPECTION

Ignition switch (for 3UR-FE)

INSPECTION

ECU power source circuit

ECU POWER SOURCE

CIRCUIT

Transponder key ECU

-

Accessory meter assembly

ON-VEHICLE INSPECTION

No code is output

Diagnosis circuit

DIAGNOSIS CIRCUIT

Ignition switch (for 2UZ-FE)

INSPECTION

Ignition switch (for 3UR-FE)

INSPECTION

ECU power source circuit

ECU POWER SOURCE

CIRCUIT

Transponder key ECU

-

Unable to register the key

Door courtesy switch circuit

DOOR COURTESY SWITCH

CIRCUIT

Ignition switch (for 2UZ-FE)

INSPECTION

Ignition switch (for 3UR-FE)

INSPECTION

ECU power source circuit

ECU POWER SOURCE

CIRCUIT

Key

DTC B2799 ENGINE

IMMOBILIZER SYSTEM

MALFUNCTION

Transponder key ECU

-

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Engine Immobilizer - Tundra

a. Disconnect the J20 amplifier connector.

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

ENGINE IMMOBILIZER SYSTEM TERMINALS RESISTANCE CHART DISCONNECT

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

c. Reconnect the J20 amplifier connector.

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

ENGINE IMMOBILIZER SYSTEM TERMINALS RESISTANCE CHART RECONNECT

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

e. Using an oscilloscope, check the waveform 1.

Waveform 1 (Reference):

ENGINE IMMOBILIZER SYSTEM 1 WAVEFORM REFERENCE

Terminal No. (Symbols)

Wiring Color

Terminal

Description

Condition

Specified

Condition

J20-7 (AGND) - Body

ground

GR - Body

ground

Ground

Always

Below 1 ohms

Terminal No.

(Symbols)

Wiring

Color

Terminal

Description

Condition

Specified Condition

J20-1 (VC5) -

J20-7 (AGND)

G-GR

Power supply

No key in Ignition

key cylinder

Below 1 V

Key inserted in

ignition key cylinder

4.6 to 5.4 V

J20-4 (CODE) -

J20-7 (AGND)

LG-GR

Demodulated signal

of key code data

No key in ignition

key cylinder

Below 1 V

Key inserted in

ignition key cylinder

Pulse generation (see

step d, waveform 1)

J20-5 (TXCT) -

J20-7 (AGND)

L-GR

Key code output

signal

No key in ignition

key cylinder

Below 1 V

Key inserted in

ignition key cylinder

Pulse generation (see

step e, waveform 2)

J20-7 (AGND) -

Body ground

GR - Body

ground

Ground

Always

Below 1 ohms

Terminal No. (Symbols)

Tool Setting

Condition

J20-4 (CODE) - 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