Toyota Tundra. Manual — part 1367

NG : REPLACE ENGINE COOLANT TEMPERATURE SENSOR (See REMOVAL )

OK : Go To Next Step

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

NG : REPLACE MASS AIR FLOW METER (See REMOVAL )

OK : REPLACE ECM (See REMOVAL )

17. 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 INTAKE SYSTEM ).

OK : Go To Next Step

18. CHECK VALVE TIMING (See INSPECTION PROCEDURE )

NG : ADJUST VALVE TIMING (See INSTALLATION )

OK : Go To Next Step

19. CHECK FUEL PRESSURE

a. Check the fuel pressure. (See ON-VEHICLE INSPECTION ).

NG : CHECK AND REPLACE FUEL PUMP, PRESSURE REGULATOR, FUEL PIPE LINE
AND FILTER

OK : Go To Next Step

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

NG : REPLACE ENGINE COOLANT TEMPERATURE SENSOR (See REMOVAL )

OK : Go To Next Step

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

NG : REPLACE MASS AIR FLOW METER (See REMOVAL )

OK : Go To Next Step

22. CHECK SPARK PLUG

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

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.)

c. Check the electrode for carbon deposits.

Recommended spark plug:

SPARK PLUG GAP SPECIFICATION

Fig. 113: Identifying Spark Plug Electrode Gap

NG : REPLACE SPARK PLUG . (See IGNITION COIL SPARK PLUG ).

OK : Go To Next Step

23. 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.

Manufacturer Product

DENSO

SK20R11

NGK

IFR6A11

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.

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

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

Fig. 114: Checking For Sparks & Ignition

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

24. 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

25. CHECK HARNESS AND CONNECTOR (ECM - INJECTOR)

a. Disconnect the injector connector (of the misfiring cylinder).

b. Disconnect the D74 ECM connector.

c. Turn the ignition switch to ON.

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

Standard voltage

STANDARD VOLTAGE SPECIFICATION

Cylinder Tester Connection Switch Condition Specified Condition

No. 1

D11-1 - Ground

Ignition switch ON

11 to 14 V

No. 2

D26-1 - Ground

Ignition switch ON

11 to 14 V

No. 3

D13-1 - Ground

Ignition switch ON

11 to 14 V

No. 4

D24-1 - Ground

Ignition switch ON

11 to 14 V

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

Fig. 115: Identifying D74 ECM Connector

e. Turn the ignition switch off.

f. Measure the resistance according to the value (s) in the table below.

Standard resistance

STANDARD RESISTANCE SPECIFICATION

No. 5

D15-1 - Ground

Ignition switch ON

11 to 14 V

No. 6

D22-1 - Ground

Ignition switch ON

11 to 14 V

No. 7

D17-1 - Ground

Ignition switch ON

11 to 14 V

No. 8

D20-1 - Ground

Ignition switch ON

11 to 14 V

Cylinder

Tester Connection

Condition Specified Condition

No. 1

D11-2-Body ground

Always

10 kohms or higher

D11-2 - D74-86 (#10)

Always

Below 1 ohms

No. 2

D26-2 - Ground

Always

10 kohms or higher

D26-2 - D74-109 (#20) Always

Below 1 ohms

No. 3

D13-2 - Ground

Always

10 kohms or higher

D13-2 - D74-85 (#30)

Always

Below 1 ohms

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra