Toyota Tundra. Manual — part 1361

STANDARD VOLTAGE SPECIFICATION

Fig. 100: Identifying Opening Relay (C/OPN)

NG : Go to step 14

OK : Go To Next Step

8. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - ECM, FUEL

PUMP ECU)

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

b. Disconnect the A24 ECM connector.

c. Disconnect the R7 fuel pump ECU connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection

Switch Condition Specified Condition

C/OPN relay (2) - Body ground Ignition switch ON

11 to 14 V

C/OPN relay (5) - Body ground Ignition switch ON

11 to 14 V

Tester Connection

Condition Specified Condition

C/OPN relay (1) - A24-48 (FC)

Always

Below 1 ohms

C/OPN relay (3) - R7-4 (+B)

Always

Below 1 ohms

C/OPN relay (1) or A24-48 (FC) - Body ground Always

10 kohms or higher

C/OPN relay (3) or R7-4 (+B) - Body ground

Always

10 kohms or higher

2008 Toyota Tundra

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

Fig. 101: Identifying A24 ECM & R7 Fuel Pump ECU Connectors

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : Go To Next Step

2008 Toyota Tundra

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

9. CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP ECU)

a. Disconnect the R6 fuel pump connector.

b. Disconnect the R8 fuel pump ECU connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Fig. 102: Identifying R6 Fuel Pump & R8 Fuel Pump ECU Connectors

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : Go To Next Step

Tester Connection

Condition Specified Condition

R6-4 (B2) - R8-1 (FP)

Always

Below 1 ohms

R6-5 (E2) - R8-2 (FP-)

Always

Below 1 ohms

R6-4 (B2) or R8-1 (FP) - Body ground

Always

10 kohms or higher

R6-5 (E2) or R8-2 (FP-) - Body ground Always

10 kohms or higher

2008 Toyota Tundra

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

10. INSPECT FUEL PUMP

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

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

OK : Go To Next Step

11. CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM, 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