Toyota Tundra. Manual — part 1267

c. Monitor Status

1. Connect the Techstream to the DLC3.

2. Turn the ignition switch ON and turn the Techstream ON.

3. Enter the following menus: Powertrain/Engine and ECT/Monitor/Evaporative System.

4. Check the Monitor Status displayed on the Techstream.

HINT:

If INCMP (Incomplete) is displayed, the monitor is not completed. Make sure that the
preconditions have been met, and perform the Monitor Conditions again.

2. Purge flow monitor confirmation (P0441)

HINT:

Perform this monitor confirmation after the Key-Off Monitor Confirmation shows COMPL (complete).

a. Preconditions

The monitor will not run unless:



The vehicle has been driven for 10 minutes or more (in a city area or on a freeway)



The ECT is between 4.4°C and 35°C (40°F and 95°F)



The IAT is between 4.4°C and 35°C (40°F and 95°F)

b. Monitor Conditions

1. Release the pressure from the fuel tank by removing and reinstalling the fuel cap.

2. Warm the engine up until the ECT reaches more than 75°C (167°F).

3. Increase the engine speed to 3000 RPM once.

4. Allow the engine to idle and turn A/C ON for 1 minute.

c. Monitor Status

1. Turn the ignition switch OFF (if ON or the engine is running).

2. Connect the Techstream to the DLC3.

3. Turn the ignition switch ON and turn the Techstream ON.

4. Enter the following menus: Powertrain/Engine and ECT/Monitor.

5. Check the Monitor Status displayed on the Techstream.

HINT:

If INCMP (Incomplete) is displayed, the monitor is not completed. Make sure that the
preconditions have been met, and perform the Monitor Conditions again.

MONITOR RESULT

2008 Toyota Tundra

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

Refer to CHECKING MONITOR STATUS .

ECM POWER SOURCE CIRCUIT

DESCRIPTION

When the ignition switch si turned ON, the battery voltage is applied to the IGSW of the ECM. The output
signal from the MREL terminal of the ECM causes a current to flow to the coil, closing the contacts of the
integration relay (EFI relay) and supplying power to either terminal +B or +B2 of the ECM.

WIRING DIAGRAM

Fig. 258: ECM Power Source Circuit - Wiring Diagram

INSPECTION PROCEDURE

1. INSPECT INTEGRATION RELAY (INTEGRATION RELAY - BODY GROUND)

a. Remove the integration relay from the engine room junction block (See ON-VEHICLE

INSPECTION ).

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

2008 Toyota Tundra

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

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig. 259: Identifying Integration Relay

OK : Go to next step.

2. INSPECT INTEGRATION RELAY (EFI RELAY AND IG2 RELAY)

a. Remove the integration relay from the engine room relay block (See ON-VEHICLE

INSPECTION ).

b. Inspect the EFI NO. 1 fuse and the IG2 MAIN fuse.

1. Remove the EFI NO. 1 fuse and IG2 MAIN fuse from the integration relay.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

c. Inspect the EFI relay and the IG2 relay.

Tester Connection Condition Specified Condition

1C-1 - Body ground Always

11 to 14 V

Tester Connection Condition Specified Condition

EFI NO. 1 fuse

Always

Below 1 ohms

IG2 MAIN fuse

Always

Below 1 ohms

2008 Toyota Tundra

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

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

Fig. 260: Inspecting Integration Relay (EFI Relay & IG2 Relay)

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

NG : REPLACE INTEGRATION RELAY (See ON-VEHICLE INSPECTION )

OK : Go to next step.

3. CHECK HARNESS AND CONNECTOR (+B, +B2 AND MREL CIRCUIT)

a. Check the harness and the connectors between the integration relay and the ECM.

1. Remove the integration relay from the engine room junction block (See ON-VEHICLE

INSPECTION ).

2. Disconnect the A24 ECM connector.

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

Standard resistance (Check for open)

Tester

Connection

Condition

Specified

Condition

1C-1 - 1B-4

When no battery voltage is 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

1C-1 - 1B-8

When no battery voltage is applied to terminals 1B-7

and 1B-6

10 kohms or

higher

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

1B-6

Below 1 ohms

2008 Toyota Tundra

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