Toyota Tundra. Manual — part 1626



Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and located
near the engine assembly.



DTC P2A00 indicates malfunctions related to the bank 1 A/F sensor.



DTC P2A03 indicates malfunctions related to the bank 2 A/F sensor.



Bank 1 refers to the bank that includes No. 1 cylinder.



Bank 2 refers to the bank that includes No. 2 cylinder.



DTC P2A00 or P2A03 may be set when the air-fuel ratio is stuck rich or lean.



A low A/F sensor voltage could be caused by a rich air-fuel mixture. Check for conditions that would
cause the engine to run rich.



A high A/F sensor voltage could be caused by a lean air-fuel mixture. Check for conditions that would
cause the engine to run lean.



Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other
data from the time the malfunction occurred.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00 AND/OR P2A03)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Turn the Techstream ON.

d. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes.

e. Read DTCs.

Result

DTC OUTPUT RESULT

HINT:

If any DTCs relating to the A/F sensor (DTCs for the A/F sensor heater or A/F sensor admittance)
are output, troubleshoot those DTCs first.

B: GO TO DTC CHART

A: Go to Next Step

2. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) (See INSPECTION

PROCEDURE )

NG: REPLACE AIR FUEL RATIO SENSOR (See REMOVAL )

Result

Proceed to

P2A00 and/or P2A03 are output

A

P2A00 and/or P2A03 and other DTCs are output

B

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2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

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OK: Go to Next Step

3. CHECK HARNESS AND CONNECTOR (ECM - AIR-FUEL RATIO SENSOR) (See

INSPECTION PROCEDURE )

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

4. PERFORM CONFIRMATION DRIVING PATTERN

5. CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON and turn the Techstream ON.

c. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes/Pending.

d. Read pending DTCs.

Result

DTC OUTPUT RESULT

B: CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT
PROBLEMS )

A: Go to Next Step

6. REPLACE AIR FUEL RATIO SENSOR

a. Replace the air fuel ratio sensor (see REMOVAL ).

7. PERFORM CONFIRMATION DRIVING PATTERN

8. CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON and turn the Techstream ON.

c. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes/Pending.

d. Read pending DTCs.

Result

DTC OUTPUT RESULT

Result

Proceed to

P2A00 and/or P2A03 is output

A

No DTC is output

B

Result

Proceed to

No DTC is output

A

P2A00 and/or P2A03 are output

B

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

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B: REPLACE ECM (See REMOVAL )

A: END

EVAP SYSTEM

RELATED DTCS

DTC REFERENCE CHART

If any EVAP system DTCs are set, the malfunctioning area can be determined using the table below.

DTC

Monitoring Item

P043E

Reference orifice clogged (built into canister pump
module)

P043F

Reference orifice high-flow (built into canister pump
module)

P0441



Purge VSV (Vacuum Switching Valve) stuck
closed



Purge VSV stuck open



Purge flow

P0451



Canister pressure sensor (built into canister
pump module) noise



Canister pressure sensor (built into canister
pump module) signal becomes fixed/flat

P0452

Canister pressure sensor (built into canister pump
module) voltage low

P0453

Canister pressure sensor (built into canister pump
module) voltage high

P0455

EVAP gross leak

P0456

EVAP small leak

P2401

Leak detection pump stuck OFF (built into canister
pump module)

P2402

Leak detection pump stuck ON (built into canister
pump module)

P2419

Vent valve stuck closed (built into canister pump
module)

P2420

Vent valve stuck open (vent) (built into canister
pump module)

P2610

Soak timer (built into ECM)

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

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Fig. 258: Malfunction Reference Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DESCRIPTION

Fig. 259: EVAP (Evaporative Emission) System Parts Location
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NOTE:

If the reference pressure difference between the first and second checks is
more than the specification, all the DTCs relating to the reference pressure
(P043E, P043F, P2401, P2402 and P2419) are stored.

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

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