Toyota Tundra. Manual — part 1554

NG: GO TO FUEL INJECTOR CIRCUIT

OK: Go to Next Step

11. CHECK FUEL INJECTOR OF MISFIRING CYLINDER

a. Check the injector injection [whether fuel volume is high or low, and whether injection pattern is

poor] (see INSPECTION ).

NG: REPLACE FUEL INJECTOR ASSEMBLY (See REMOVAL )

OK: Go to Next Step

12. CHECK AIR INDUCTION SYSTEM

a. Check the air induction system for vacuum leakage (see ON-VEHICLE INSPECTION ).

OK: No leakage from air induction system.

NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM (See REMOVAL )

OK: Go to Next Step

13. CHECK VALVE TIMING (See INSPECTION PROCEDURE )

NG: ADJUST VALVE TIMING (See REASSEMBLY )

OK: Go to Next Step

14. CHECK FUEL LEAK

a. Check the fuel leak (see ON-VEHICLE INSPECTION ).

NG: REPAIR OR REPLACE FUEL LEAKAGE POINT

OK: Go to Next Step

15. CHECK FUEL PRESSURE SWITCHING SYSTEM

a. Check the Fuel Pressure Switching System (see FUEL PRESSURE SWITCHING SYSTEM ).

HINT:

If the problem area cannot be determined by checking the fuel pressure switching system, proceed
to the next step.

16. READ VALUE USING TECHSTREAM (COOLANT TEMP) (See INSPECTION PROCEDURE )

D74-106 (#80) - D74-43 (E01) Ignition switch ON

11 to 14 V

2009 Toyota Tundra

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

NG: REPLACE ENGINE COOLANT TEMPERATURE SENSOR (See REMOVAL )

OK: Go to Next Step

17. READ VALUE USING TECHSTREAM (MAF) (See INSPECTION PROCEDURE )

NG: REPLACE MASS AIR FLOW METER (See REMOVAL )

OK: REPLACE ECM (See REMOVAL )

18. CHECK AIR INDUCTION SYSTEM

a. Check the air induction system for vacuum leakage (see ON-VEHICLE INSPECTION ).

OK: No leakage from air induction system.

NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM (See REMOVAL )

OK: Go to Next Step

19. CHECK VALVE TIMING (See INSPECTION PROCEDURE )

NG: ADJUST VALVE TIMING (See REASSEMBLY )

OK: Go to Next Step

20. CHECK FUEL LEAK

a. Check the fuel leak (see ON-VEHICLE INSPECTION ).

NG: REPAIR OR REPLACE FUEL LEAKAGE POINT

OK: Go to Next Step

21. CHECK FUEL PRESSURE SWITCHING SYSTEM

a. Check the Fuel Pressure Switching System (See FUEL PRESSURE SWITCHING SYSTEM ).

HINT:

If the problem area cannot be determined by checking the fuel pressure switching system, proceed
to the next step.

22. READ VALUE USING TECHSTREAM (COOLANT TEMP) (See INSPECTION PROCEDURE )

NG: REPLACE ENGINE COOLANT TEMPERATURE SENSOR (See REMOVAL )

OK: Go to Next Step

2009 Toyota Tundra

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

23. READ VALUE USING TECHSTREAM (MAF) (See INSPECTION PROCEDURE )

NG: REPLACE MASS AIR FLOW METER (See REMOVAL )

OK: Go to Next Step

24. 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. 126: Measuring Spark Plug Electrode Gap
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

c. Check the electrode for carbon deposits.

Recommended spark plug:

SPARK PLUG SPECIFICATION

NG: REPLACE SPARK PLUG (See REMOVAL )

OK: Go to Next Step

25. CHECK FOR SPARKS AND IGNITION

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

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.

2009 Toyota Tundra

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

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. 127: 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.

NG: Go to step 29

OK: Go to Next Step

26. 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

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

AND/OR #80 VOLTAGE)

a. Disconnect the D74 ECM connector.

NOTE:

Do not crank the engine for more than 2 seconds.

2009 Toyota Tundra

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