Toyota Tundra. Manual — part 1661

Fig. 419: Removing Integration Relay From Engine Room Relay Block
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2. INSPECT INTEGRATION RELAY (IG2)

a. Measure the resistance of the IG2 MAIN fuse.

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

Standard Resistance

RESISTANCE SPECIFIED CONDITIONS

NOTE:



Some relays are built into the integration relay (unit E). The
integration relay cannot be disassembled. If there is a malfunction in
the circuit of the integration relay, replace the integration relay.



The internal circuit of the integration relay is as shown in the
illustration below. Inspect the integration relay using the following
procedures.

Fig. 420: Integration Relay (Unit E) Inner Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2009 Toyota Tundra

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

Saturday, June 19, 2010 7:34:51 PM

Page 737

© 2006 Mitchell Repair Information Company, LLC.

If the result is not as specified, replace the IG2 MAIN fuse.

b. Measure the resistance of the ignition relay No. 2 (IG2) circuit.

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

Standard Resistance

RESISTANCE SPECIFIED CONDITIONS

Fig. 421: Identifying Integration Relay Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

If the result is not as specified, replace the integration relay.

3. INSTALL INTEGRATION RELAY (UNIT E)

a. Connect the 3 connectors.

b. Install the integration relay to the engine room relay block.

c. Install the engine room relay block cover.

EFI RELAY

Tester Connection Condition Specified Condition

IG2 MAIN fuse

Always

Below 1 ohms

Tester

Connection

Condition

Specified

Condition

1C-1 - 1B-8

When battery voltage is not applied to terminals 1B-6
and 1B-7

10 kohms or

higher

When battery voltage is applied to terminals 1B-6 and
1B-7

Below 1 ohms

2009 Toyota Tundra

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

Saturday, June 19, 2010 7:34:52 PM

Page 738

© 2006 Mitchell Repair Information Company, LLC.

ON-VEHICLE INSPECTION

1. REMOVE INTEGRATION RELAY (UNIT E)

a. Remove the engine room relay block cover.

b. Using a screwdriver, detach the 2 claws and remove the integration relay from the engine room

relay block.

HINT:

Tape the screwdriver tip before use.

Fig. 422: Removing Integration Relay From Engine Room Relay Block
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

c. Disconnect the 3 connectors.

2. INSPECT INTEGRATION RELAY (EFI RELAY)

NOTE:



Some relays are built into the integration relay (unit E). The
integration relay cannot be disassembled. If there is a malfunction in
the circuit of the integration relay, replace the integration relay.



The internal circuit of the integration relay is as shown in the
illustration below. Inspect the integration relay using the following
procedures.

Fig. 423: Integration Relay (Unit E) Inner Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2009 Toyota Tundra

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

Saturday, June 19, 2010 7:34:52 PM

Page 739

© 2006 Mitchell Repair Information Company, LLC.

a. Measure the resistance of the EFI No. 1 fuse.

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

Standard Resistance

RESISTANCE SPECIFIED CONDITIONS

If the result is not as specified, replace the EFI No. 1 fuse.

b. Measure the resistance of the EFI relay circuit.

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

Standard Resistance

RESISTANCE SPECIFIED CONDITIONS

Fig. 424: Identifying Integration Relay Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

If the result is not as specified, replace the integration relay.

3. INSTALL INTEGRATION RELAY (UNIT E)

a. Connect the 3 connectors.

Tester Connection Condition Specified Condition

EFI NO. 1 fuse

Always

Below 1 ohms

Tester

Connection

Condition

Specified

Condition

1C-1 - 1B-4
1C-1 - 1B-5

When battery voltage Is not applied to terminals 1B-2
and 1B-3

10 kohms or

higher

When battery voltage Is applied to terminals 1B-2 and
1B-3

Below 1 ohms

2009 Toyota Tundra

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

Saturday, June 19, 2010 7:34:52 PM

Page 740

© 2006 Mitchell Repair Information Company, LLC.