Toyota Tundra. Manual — part 1553

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. 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



Sensor Output Reference Values

SENSOR OUTPUT REFERENCE VALUES



Reference values when normal (E0 Fuel)

SENSOR OUTPUT REFERENCE VALUES - NORMAL (E0 FUEL)

Result

Proceed to

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%

C

Except above

B

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

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

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%

2009 Toyota Tundra

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



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

SENSOR OUTPUT REFERENCE VALUES - PURGE HOSE DISCONNECTED

B: Go to step 18

C: Go to step 31

A: Go to Next Step

7. INSPECT SPARK PLUG

a. Remove the ignition coil and the spark plug of the misfiring cylinder (see REMOVAL ).

b. Measure the spark plug electrode gap.

Standard gap: 1.0 to 1.1 mm (0.0394 to 0.0433 in.)

Fig. 123: Measuring Spark Plug Electrode Gap
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

c. Check the electrode for carbon deposits.

Alcohol Density Learning Compl

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

2009 Toyota Tundra

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

Recommended spark plug:

SPARK PLUG SPECIFICATION

NG: REPLACE SPARK PLUG (See REMOVAL )

OK: Go to Next Step

8. CHECK FOR SPARKS AND IGNITION

a. Disconnect the injector connectors to prevent the engine from starting.

b. Remove the ignition coil from the cylinder head (see REMOVAL ).

c. Install the spark plug onto the ignition coil.

d. Attach the spark plug assembly to the cylinder head.

Fig. 124: Attaching Spark Plug Assembly To Cylinder Head
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

e. Crank the engine for less than 2 seconds and check the spark.

OK: Sparks jump across electrode gap.

f. Install the ignition coil.

g. Reconnect the injector connectors.

Manufacturer Product

DENSO

SK20HR11

NOTE:

If the electrode gap is larger than standard, replace the spark plug.
Do not adjust the electrode gap.

CAUTION: Always disconnect all injector connectors.

NOTE:

Do not crank the engine for more than 2 seconds.

2009 Toyota Tundra

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

NG: Go to step 29

OK: Go to Next Step

9. CHECK CYLINDER COMPRESSION PRESSURE

a. Measure the cylinder compression pressure of the misfiring cylinder (see ON-VEHICLE

INSPECTION ).

NG: REPAIR ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

OK: Go to Next Step

10. INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30, #40, #50, #60, #70

AND/OR #80 VOLTAGE)

a. Disconnect the D74 ECM connector.

Fig. 125: Identifying Terminals Of D74 ECM Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Turn the ignition switch to ON.

c. Measure the voltage according to the value(s) in the table below.

Standard voltage

VOLTAGE SPECIFIED CONDITION

Tester Connection

Switch Condition Specified Condition

D74-86 (#10) - D74-43 (E01) Ignition switch ON

11 to 14 V

D74-109 (#20) - D74-43 (E01) Ignition switch ON

11 to 14 V

D74-85 (#30) - D74-43 (E01) Ignition switch ON

11 to 14 V

D74-108 (#40) - D74-43 (E01) Ignition switch ON

11 to 14 V

D74-84 (#50) - D74-43 (E01) Ignition switch ON

11 to 14 V

D74-107 (#60) - D74-43 (E01) Ignition switch ON

11 to 14 V

D74-83 (#70) - D74-43 (E01) Ignition switch ON

11 to 14 V

2009 Toyota Tundra

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