Toyota Tundra. Manual — part 1366

OK : Go To Next Step

7. 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

8. 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

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

2008 Toyota Tundra

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

Fig. 111: 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

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

No. 4

D24-2 - Ground

Always

10 kohms or higher

D24-2 - D74-108 (#40) Always

Below 1 ohms

No. 5

D15-2 - Ground

Always

10 kohms or higher

D15-2 - D74-84 (#50)

Always

Below 1 ohms

D22-2 - Ground

Always

10 kohms or higher

2008 Toyota Tundra

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

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : Go To Next Step

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

AND/OR #80 VOLTAGE)

a. Disconnect the D74 ECM connector.

b. Turn the ignition switch to ON.

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

Standard voltage

STANDARD VOLTAGE SPECIFICATION

No. 6

D22-2 - D74-107 (#60) Always

Below 1 ohms

No. 7

D17-2 - Ground

Always

10 kohms or higher

D17-2 - D74-83 (#70)

Always

Below 1 ohms

No. 8

D20-2 - Ground

Always

10 kohms or higher

D20-2 - D74-106 (#80) Always

Below 1 ohms

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

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

11 to 14 V

2008 Toyota Tundra

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

Fig. 112: Identifying D74 ECM Connector

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ECM)

OK : Go To Next Step

10. 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 FUEL INJECTOR ).

OK : Go To Next Step

11. CHECK VALVE CLEARANCE OF MISFIRING CYLINDER

a. Check the valve clearance. (See ADJUSTMENT ).

NG : ADJUST VALVE CLEARANCE (See ADJUSTMENT )

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 INTAKE SYSTEM ).

OK : Go To Next Step

13. CHECK VALVE TIMING (See INSPECTION PROCEDURE )

NG : ADJUST VALVE TIMING (See INSTALLATION )

OK : Go To Next Step

14. 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

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

2008 Toyota Tundra

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