Toyota Tundra. Manual — part 1334

Fig. 45: Identifying D33 Or D34 A/F Sensor Connector

B : Go to step 5

A : Go To Next Step

3. INSPECT INTEGRATION RELAY (A/F)

a. Remove the integration relay from the engine room relay block.

b. Inspect the A/F fuse.

1. Remove the A/F fuse from the integration relay.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

3. Reinstall the A/F fuse.

c. Inspect the integration relay (A/F).

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

Tester Connection Condition Specified Condition

A/F fuse

Always

Below 1 ohms

2008 Toyota Tundra

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

Fig. 46: Identifying Integration Relay Connector Terminal

Standard resistance

STANDARD RESISTANCE SPECIFICATION

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

OK : Go To Next Step

4. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - A/F SENSOR AND BODY

GROUND)

a. Disconnect the D33 or D34 A/F sensor connector.

b. Remove the integration relay from the engine room relay block.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester
Connection

Condition

Specified

Condition

1C-1 -1A-4

When no battery voltage applied to terminals 1A-2
and 1A-3

10 kohms or higher

When battery voltage applied to terminals 1A-2 and
1A-3

Below 1 ohms

Tester Connection

Condition Specified Condition

D33-2 (+B) - 1A-4

Always

Below 1 ohms

D34-2 (+B) - 1A-4

Always

Below 1 ohms

1A-2 - 1B-5

Always

Below 1 ohms

1A-3 - Body ground

Always

Below 1 ohms

2008 Toyota Tundra

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

Fig. 47: Identifying Integration Relay & D33 Or D34 A/F Sensor Connectors

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : CHECK ECM POWER SOURCE CIRCUIT (See ECM POWER SOURCE CIRCUIT )

5. CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM)

a. Disconnect the D33 or D34 A/F sensor connector.

b. Disconnect the D74 ECM connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

D33-2 (+B) or 1A-4 - Body ground Always

10 kohms or higher

D34-2 (+B) or 1A-4 - Body ground Always

10 kohms or higher

1A-2 or 1B-5 - Body ground

Always

10 kohms or higher

Tester Connection

Condition Specified Condition

D33-1 (HA1A) - D74-22 (HA1A)

Always

Below 1 ohms

2008 Toyota Tundra

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

Fig. 48: Identifying D74 ECM & D33 Or D34 A/F Sensor Connectors

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : Go To Next Step

6. CHECK WHETHER DTC OUTPUT RECURS

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Turn the Techstream ON.

d. Clear DTCs. (See DTC CHECK/CLEAR ).

e. Start the engine.

f. Allow the engine to idle for 1 minute or more.

g. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes.

h. Read DTCs.

D34-1 (HA2A) - D74-20 (HA2A)

Always

Below 1 ohms

D33-1 (HA1A) or D74-22 (HA1A) - Body ground Always

10 kohms or higher

D34-1 (HA2A) or D74-20 (HA2A) - Body ground Always

10 kohms or higher

2008 Toyota Tundra

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