Toyota Tundra. Manual — part 1475

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

4. INSTALL INTEGRATION RELAY (UNIT E)

a. Connect the 3 connectors.

Fig. 392: Identifying Integration Relay Connector

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

c. Install the engine room relay block cover.

5. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL

EFI RELAY

ON-VEHICLE INSPECTION

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

2. REMOVE INTEGRATION RELAY (UNIT E)

a. Remove the engine room relay block cover.

NOTE:

Some systems need to be initialized after the cable is reconnected. (See
INITIALIZATION ).

NOTE:



Some systems need to be initialized after the cable is reconnected.
(See INITIALIZATION ).



After the ignition switch is turned OFF, the navigation system
requires approximately 90 seconds to record various types of
memory and settings. As a result, after turning the ignition switch
OFF, wait 90 seconds or more before disconnecting the cable from
the negative (-) battery terminal.

2008 Toyota Tundra

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

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

relay block.

HINT:

Tape the screwdriver tip before use.

c. Disconnect the 3 connectors.

3. 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. 393: Detaching Claws

2008 Toyota Tundra

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

Fig. 394: Integration Relay Inner - Circuit Diagram

a. Measure the resistance of the EFI fuse.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

If the result is not as specified, replace the EFI 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

STANDARD RESISTANCE SPECIFICATION

Tester Connection Condition Specified Condition

EFI No. 1 fuse

Always

Below 1 ohms

Tester

Connection

Condition

Specified
Condition

1C-1 - 1B-4

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

2008 Toyota Tundra

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

Fig. 395: Identifying Integration Relay Connector

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

4. 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.

5. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL

CIRCUIT OPENING RELAY

ON-VEHICLE INSPECTION

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

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

NOTE:

Some systems need to be initialized after the cable is reconnected. (See
INITIALIZATION ).

NOTE:



Some systems need to be initialized after the cable is reconnected.
(See INITIALIZATION ).



After the ignition switch is turned OFF, the navigation system
requires approximately 90 seconds to record various types of
memory and settings. As a result, after turning the ignition switch

2008 Toyota Tundra

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