Toyota Tundra. Manual — part 1571



Reference values when normal (E0 Fuel)

SENSOR OUTPUT REFERENCE VALUES - NORMAL (E0 FUEL)



Reference values when A/F sensor (Bank 1) is malfunctioning (E0 Fuel)

SENSOR OUTPUT REFERENCE VALUES - A/F SENSOR MALFUNCTIONING



Reference values when HO2 sensor (Bank 1) is malfunctioning (E0 Fuel)

SENSOR OUTPUT REFERENCE VALUES - HO2 SENSOR MALFUNCTIONING

Rich

Below 3.25 V

Higher than 0.55 V

AFS Voltage B1 S1

3.28 V

AFS Voltage B2 S1

3.28 V

O2S B1 S2

0.76 V

O2S B2 S2

0.70 V

Short FT #1

1%

Long FT #1

-6%

Short FT #2

2%

Long FT #2

-6%

AF Lambda B1 S1

0.99

AF Lambda B2 S1

0.99

Alcohol Density Estimate 0%
Alcohol Density Learning Compl

AFS Voltage B1 S1

4.99 V

AFS Voltage B2 S1

3.25 V

O2S B1 S2

0.95 V

O2S B2 S2

0.74 V

Short FT #1

0%

Long FT #1

17.1%

Short FT #2

0%

Long FT #2

-6.3%

AF Lambda B1 S1

1.23

AF Lambda B2 S1

0.99

Alcohol Density Estimate 41%
Alcohol Density Learning Compl

AFS Voltage B1 S1

3.23 V

AFS Voltage B2 S1

3.28 V

O2S B1 S2

0.00 V

O2S B2 S2

0.68 V

Short FT #1

0%

2009 Toyota Tundra

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

B: REPLACE AIR FUEL RATIO SENSOR (See REMOVAL )

C: Go to step 4

D: Go to step 3

A: GO TO DTC (P0171, P0172, P0174, P0175) (See DTC P0171 SYSTEM TOO LEAN
(BANK 1); DTC P0172 SYSTEM TOO RICH (BANK 1); DTC P0174 SYSTEM TOO
LEAN (BANK 2); DTC P0175 SYSTEM TOO RICH (BANK 2) )

3. INSPECT FOR EXHAUST GAS LEAK

OK: No gas leakage.

Result

RESULT REFERENCE

B: Go to step 5

A: REPAIR OR REPLACE EXHAUST GAS LEAK POINT

4. INSPECT FOR EXHAUST GAS LEAK

OK: No gas leakage.

NG: REPAIR OR REPLACE EXHAUST GAS LEAK POINT

OK: REPLACE HEATED OXYGEN SENSOR (See REMOVAL )

5. CHECK DTC OUTPUT (DTC P0420 AND/OR P0430)

a. According to the output DTCs in the step 1 (Check Any Other DTCs Output), proceed to next step

referring to the table below.

Long FT #1

-1.6%

Short FT #2

2%

Long FT #1

-6.3%

AF Lambda B1 S1

0.99

AF Lambda B2 S1

0.99

Alcohol Density Estimate 0%
Alcohol Density Learning Compl

Result Proceed to
NG

A

OK

B

2009 Toyota Tundra

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

Result

RESULT REFERENCE

B: REPLACE FRONT NO. 2 EXHAUST PIPE ASSEMBLY (See REMOVAL )

C: REPLACE FRONT EXHAUST PIPE ASSEMBLY (See REMOVAL )

D: REPLACE FRONT EXHAUST PIPE ASSEMBLY (See REMOVAL )

A: Go to Next Step

6. REPLACE FRONT NO. 2 EXHAUST PIPE SUB-ASSEMBLY

a. Replace the front No. 2 exhaust pipe sub-assembly (See REMOVAL ).

NEXT: REPLACE FRONT NO. 3 EXHAUST PIPE SUB-ASSEMBLY (See REMOVAL )

DTC P043E EVAPORATIVE EMISSION SYSTEM LEAK DETECTION REFERENCE ORIFICE
LOW FLOW; DTC P043F EVAPORATIVE EMISSION SYSTEM REFERENCE ORIFICE HIGH
FLOW; DTC P2401 EVAPORATIVE EMISSION LEAK DETECTION PUMP STUCK OFF; DTC
P2402 EVAPORATIVE EMISSION LEAK DETECTION PUMP STUCK ON; DTC P2419
EVAPORATIVE EMISSION SYSTEM SWITCHING VALVE CONTROL CIRCUIT LOW

DTC SUMMARY

DTC SUMMARY

Result

Proceed to

P0420 (for Regular Cab Standard Deck)

A

P0420 (except Regular Cab Standard Deck)

B

P0430 (for Regular Cab Standard Deck)

C

P0430 (except Regular Cab Standard Deck)

D

P0420 and P0430 (for Regular Cab Standard Deck)

A and C

P0420 and P0430 (except Regular Cab Standard Deck) B and D

DTC

Monitoring

Item

Malfunction Detection

Condition

Trouble Area

Detection

Timing

Detection

Logic

P043E

Reference
orifice
clogged

P043E, P043F, P2401,
P2402 and P2419 present
when one of following
conditions met during key-
off EVAP monitor:



Reference orifice
clogged



Reference orifice
high-flow



Canister pump module
(Reference orifice, leak
detection pump, vent
valve)



Connector/wire harness
(Canister pump module
- ECM)



EVAP system hose

While
ignition
switch off

2 trip

P043F

Reference
orifice high-
flow

P2401

Leak
detection
pump stuck
OFF

2009 Toyota Tundra

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

HINT:

The reference orifice is located inside the canister pump module.

DESCRIPTION

The description can be found in the EVAP (Evaporative Emission) System (See DESCRIPTION ).

INSPECTION PROCEDURE

Refer to the EVAP SYSTEM .

MONITOR DESCRIPTION

5 hours* after the ignition switch is turned off, the leak detection pump creates negative pressure (vacuum) in
the EVAP system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure.

HINT:

*: If the engine coolant temperature is not below 35°C (95°F) 5 hours after the ignition switch is turned off, the
monitor check starts 2 hours later. If it is still not below 35°C (95°F) 7 hours after the ignition switch is turned
off, the monitor check starts 2.5 hours later.

MONITOR DESCRIPTION

P2402

Leak
detection
pump stuck
ON



Leak detection pump
OFF malfunction



Leak detection pump
ON malfunction



Vent valve ON (close)
malfunction

(pipe from air inlet port
to canister pump
module, canister filter,
fuel tank vent hose)



ECM

P2419

Vent valve
stuck closed

Sequence

Operation

Description

Duration

-

ECM activation

Activated by soak timer 5, 7 or 9.5 hours after ignition switch
turned off.

-

A

Atmospheric
pressure
measurement

Vent valve turned OFF (vent) and EVAP system pressure
measured by ECM in order to register atmospheric pressure.
If pressure in EVAP system not between 70 kPa-a and 110
kPa-a (525 mmHg-a and 825 mmHg-a), ECM cancels EVAP
system monitor.

10

seconds

B

First reference
pressure
measurement

In order to determine reference pressure, leak detection pump
creates negative pressure (vacuum) through reference orifice
and then ECM checks if leak detection pump and vent valve
operate normally.

60

seconds

EVAP system

Vent valve turned ON (closed) to shut EVAP system.
Negative pressure (vacuum) created in EVAP system, and
EVAP system pressure then measured.

15

2009 Toyota Tundra

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