Toyota Tundra. Manual — part 1186

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig. 98: Identifying R7 Fuel Pump ECU Connector Terminals

OK : Go to next step

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

10. 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 (Check for open)

TESTER CONNECTION SPECIFIED CONDITION

Standard resistance (Check for short)

TESTER CONNECTION SPECIFIED CONDITION

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Tester Connection

Condition Specified Condition

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 (1GR-FE) - Tundra

Fig. 99: Identifying R6 Fuel Pump Connector Terminals

OK : Go to next step

11. INSPECT FUEL PUMP

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

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

OK : Go to next step

12. 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 (Check for open)

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection

Condition Specified Condition

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

Standard resistance (Check for short)

TESTER CONNECTION SPECIFIED CONDITION

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig. 100: Identifying R7 Fuel Pump ECU Connector Terminals

OK : Go to next step

13. INSPECT FUEL PUMP ECU (FPC SIGNAL)

a. Disconnect the fuel pump ECU connector.

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

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

Tester Connection

Condition Specified Condition

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 (1GR-FE) - Tundra