Toyota Tundra. Manual — part 1296

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

Fig. 380: Identifying Integration Relay Connector Terminals

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

EFI RELAY

ON-VEHICLE INSPECTION

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

1B-7

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 (1GR-FE) - Tundra

2. REMOVE INTEGRATION RELAY (UNIT E)

a. Remove the engine room relay block cover.

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)

Fig. 381: Locating Integration Relay Claws

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.

2008 Toyota Tundra

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

a. Measure the resistance of the EFI fuse.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

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

TESTER CONNECTION SPECIFIED CONDITION

Fig. 382: Integration Relay (Unit E) Inner - Circuit Diagram

Tester Connection Condition Specified Condition

EFI fuse

Always

Below 1 ohms

Tester

Connection

Condition

Specified

Condition

1C-1 - 1B-4

When battery voltage is not applied between 1B-2
and 1B-3

10 kohms or higher

When battery voltage is applied between 1B-2 and

Below 1 ohms

2008 Toyota Tundra

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

Fig. 383: Identifying Integration Relay Connector Terminals

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

1B-3

1C-1 - 1B-5

When battery voltage is not applied between 1B-2
and 1B-3

10 kohms or higher

When battery voltage is applied between 1 B-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

2008 Toyota Tundra

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