Toyota Tundra. Manual — part 1641

c. Enter the following menus: Powertrain/Engine and ECT/Active Test/Control the Fuel Pump/Speed.

d. Check whether operating sounds can be heard while operating the relay using the Techstream.

OK:

Operating sounds can be heard from relay.

NG: Go to step 5

OK: Go to Next Step

2. 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.

Fig. 304: Identifying R7 Fuel Pump ECU And A24 ECM Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

3. REPLACE FUEL PUMP ECU

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 more

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

Always

10 kohms or more

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

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© 2006 Mitchell Repair Information Company, LLC.

a. Replace the fuel pump ECU (see REMOVAL ).

4. 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

5. INSPECT CIRCUIT OPENING RELAY (C/OPN)

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

INSPECTION ).

Fig. 305: Identifying Circuit Opening Relay Circuit With Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

NG: REPLACE CIRCUIT OPENING RELAY (C/OPN) (See ON-VEHICLE INSPECTION )

OK: Go to Next Step

6. INSPECT CIRCUIT OPENING RELAY (POWER SOURCE VOLTAGE)

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

INSPECTION ).

Tester Connection

Condition

Specified Condition

3 - 5

When no battery voltage applied to terminals 1 and 2 10 kohms or higher

3 - 5

When battery voltage applied to terminals 1 and 2

Below 1 ohms

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Saturday, June 19, 2010 7:34:49 PM

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© 2006 Mitchell Repair Information Company, LLC.

Fig. 306: Identifying Circuit Opening Relay (C/OPN) Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Turn the ignition switch to ON.

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

Standard voltage

VOLTAGE SPECIFIED CONDITION

NG: Go to step 13

OK: Go to Next Step

7. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - ECM AND FUEL

PUMP ECU)

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

INSPECTION ).

b. Disconnect the A24 ECM connector.

c. Disconnect the R7 fuel pump ECU connector.

Fig. 307: Identifying A24 ECM, Circuit Opening Relay And R7 Fuel Pump ECU Connector
Terminals

Tester Connection

Switch Condition Specified Condition

C/OPN relay (1) - Body ground Ignition switch ON

11 to 14 V

C/OPN relay (3) - Body ground Ignition switch ON

11 to 14 V

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

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© 2006 Mitchell Repair Information Company, LLC.

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

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

a. Disconnect the R6 fuel pump connector.

b. Disconnect the R8 fuel pump ECU connector.

Fig. 308: Identifying R6 Fuel Pump And R8 Fuel Pump ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection

Condition Specified Condition

C/OPN relay (2) - A24-48 (FC)

Always

Below 1 ohms

C/OPN relay (5) - R7-4 (+B)

Always

Below 1 ohms

C/OPN relay (2) or A24-48 (FC) - Body ground Always

10 kohms or higher

C/OPN relay (5) or R7-4 (+B) - Body ground

Always

10 kohms or higher

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

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Saturday, June 19, 2010 7:34:49 PM

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© 2006 Mitchell Repair Information Company, LLC.