Toyota Tundra. Manual - part 1540

8. Enter the following menus: Powertrain/Engine and ECT/Data List/Flexible Fuel Vehicle.

9. Record data using snapshots.

10. Start the engine.

HINT:

After clearing the DTCs, the engine may become difficult to start if the concentration of alcohol in the
fuel is high. Therefore, it may be necessary to crank the engine a few times before it starts.

11. Drive the vehicle at 32 km/h (20 mph) or more and maintain a constant speed for 2 minutes or more.

12. After this driving make sure that the Data List "Alcohol Density Learning" is "Compl".

13. While the engine is idling, monitor the output voltages of the A/F and HO2 sensors (AFS Voltage B1S1

and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the Techstream.

Result

RESULT REFERENCE

Result

Main Suspected Trouble Area

A/F sensor output between 3.1 and 3.4 V
and
O2 sensor output slowly changes in the range of 0
and 1 V
and
Aggregate fuel trim *1 between -20 and 65%

A/F sensor output consistently outside range of
3.1 to 3.4 V
and
O2 sensor output and A/F sensor output contradict
each other*2



A/F sensor



A/F sensor heater



A/F sensor circuit

A/F sensor output between 3.1 and 3.4 V
and
O2 sensor output consistently indicates rich or
lean



HO2 sensor



HO2 sensor heater



HO2 sensor circuit

A/F sensor and O2 sensor output both consistently
indicate rich or lean
or
Aggregate fuel trim*1 less than -20%
or
Aggregate fuel trim*1 more than 65%



Injector



Fuel pressure



Gas leak from exhaust system (Air-fuel ratio
extremely rich or lean)

HINT:



*1: Aggregate fuel trim is approximately equal to the following: Short FT + ((1 + Long FT/100) x
(1 + (Alcohol Density Estimate/2/100)) -1) x 100



*2: For example, the A/F sensor output indicates rich while the O2 sensor output indicates lean.

2009 Toyota Tundra

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



Sensor Output Reference Values

SENSOR OUTPUT REFERENCE VALUES



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 (E0 FUEL)



Reference values when purge hose disconnected (both banks are lean) (E0 Fuel)

SENSOR OUTPUT REFERENCE VALUES - PURGE HOSE DISCONNECTED

Air-fuel Ratio A/F Sensor

HO2 Sensor

Lean

Higher than 3.25 V Below 0.4 V

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

Long FT #1

-6%

Short FT #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

Long FT #1

17.1%

Short FT #2

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

2009 Toyota Tundra

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



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

SENSOR OUTPUT REFERENCE VALUES - HO2 SENSOR (BANK 1)
MALFUNCTIONING

HINT:



If other DTCs relating to different systems that have terminal E2 as the ground terminal are output
simultaneously, terminal E2 may have an open circuit.



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.



If the OX1B wire from the ECM connector is short-circuited to the +B wire, DTC P0136 will be
set.



If the OX2B wire from the ECM connector is short-circuited to the +B wire, DTC P0156 will be
set.

AFS Voltage B1 S1

3.45 V

AFS Voltage B2 S1

3.56 V

O2S B1 S2

0.03 V

O2S B2 S2

0.03 V

Short FT #1

20.3%

Long FT #1

-1.6%

Short FT #2

19.5%

Long FT #2

-6.3%

AF Lambda B1 S1

1.04

AF Lambda B2 S1

1.08

Alcohol Density Estimate 85%
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

Long FT #1

-1.6%

Short FT #2

Long FT #2

-6.3%

AF Lambda B1 S1

0.99

AF Lambda B2 S1

0.99

Alcohol Density Estimate 0%
Alcohol Density Learning Compl

2009 Toyota Tundra

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

1. READ OUTPUT DTC

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

RESULT REFERENCE

f. Warm up the engine until the engine coolant temperature is 75°C (167°F) or more.

g. Clear DTC (See DTC CHECK/CLEAR ).

h. Start the engine.

HINT:

After clearing the DTCs, the engine becomes difficult to start if the concentration of alcohol in the
fuel is high.

Therefore, it may be necessary to crank the engine a few times before it starts.

i. Drive the vehicle at 32 km/h (20 mph) or more and maintain a constant speed for 2 minutes or

more.

j. After this driving make sure that the Data List "Alcohol Density Learning" is "Compl".

B: Go to step 16

C: Go to step 6

D: Go to step 24

A: Go to Next Step

2. READ VALUE TECHSTREAM (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR)

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/Data List/A/F Control System/O2S B1 S2

Result

Proceed to

P0138 or P0158 is output

P0137 or P0157 is output

P0136 or P0156 is output

P0139 or P0159 is output

2009 Toyota Tundra

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

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