Toyota Tundra. Manual — part 1453

OK : Go to Next Step

9. INSPECT FUEL PUMP

a. Inspect the fuel pump. (See INSPECTION ).

NG : REPLACE FUEL PUMP . (See FUEL PUMP ).

OK : Go to Next Step

10. CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM AND BODY GROUND)

a. Disconnect the R7 fuel pump ECU connector.

b. Disconnect the A24 ECM connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection

Condition Specified Condition

R7-1 (FPC) - A24-52 (FPC)

Always

Below 1 ohms

R7-2 (DI) - A24-18 (DI)

Always

Below 1 ohms

R7-3 (E) - Body ground

Always

Below 1 ohms

R7-1 (FPC) or A24-52 (FPC) - Body ground Always

10 kohms or higher

R7-2 (DI) or A24-18 (DI) - Body ground

Always

10 kohms or higher

2008 Toyota Tundra

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

Fig. 294: Identifying A24 ECM & R7 Fuel Pump ECU Connectors

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : Go to Next Step

11. REPLACE FUEL PUMP ECU

a. Replace the fuel pump ECU. (See FUEL PUMP ECU ).

12. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

a. Check the fuel pump operation.

OK: Malfunction has been repaired successfully.

NG : REPLACE ECM (See REMOVAL )

OK : END

13. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - IGN FUSE

AND INTEGRATION RELAY)

a. Remove the circuit opening relay (C/OPN) from the engine room relay block.

2008 Toyota Tundra

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

b. Remove the IGN fuse from the engine room relay block.

c. Remove the integration relay from the engine room relay block.

d. Disconnect the 1B integration relay connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection

Condition Specified Condition

C/OPN relay (2) - IGN fuse (2)

Always

Below 1 ohms

C/OPN relay (5) - 1B-4

Always

Below 1 ohms

C/OPN relay (2) or IGN fuse (2) - Body ground Always

10 kohms or higher

C/OPN relay (5) or 1B-4 - Body ground

Always

10 kohms or higher

2008 Toyota Tundra

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

Fig. 295: Identifying 1B Integration Relay Connector & Relay (C/OPN)

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : GO TO ECM POWER SOURCE CIRCUIT

FUEL INJECTOR CIRCUIT

DESCRIPTION

The fuel injectors are located on the intake manifold. They inject fuel into the cylinders based on the signals
from the ECM.

WIRING DIAGRAM

Fig. 296: Fuel Injector - Wiring Diagram

INSPECTION PROCEDURE

2008 Toyota Tundra

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