Toyota Tundra. Manual — part 1518

Fig. 53: Identifying Terminals Of D33 Or D34 A/F Sensor Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Turn the ignition switch to ON.

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

Standard voltage

VOLTAGE SPECIFIED CONDITION

Result

RESULT REFERENCE

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 (see ON-VEHICLE

INSPECTION ).

b. Inspect the A/F fuse.

Tester Connection

Switch Condition Specified Condition

D33-2 (+B) - Body ground Ignition switch ON

11 to 14 V

D34-2 (+B) - Body ground Ignition switch ON

11 to 14 V

Result Proceed to

NG

A

OK

B

2009 Toyota Tundra

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

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

Fig. 54: Identifying Integration Relay Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard resistance

RESISTANCE SPECIFIED CONDITION

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.

Standard resistance

RESISTANCE SPECIFIED CONDITION

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.

Tester Connection Condition Specified Condition

A/F fuse

Always

Below 1 ohms

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

2009 Toyota Tundra

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

Fig. 55: Identifying Terminals Of D33 Or D34 A/F Sensor Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Remove the integration relay from the engine room relay block (see ON-VEHICLE

INSPECTION ).

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

Standard resistance

2009 Toyota Tundra

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

RESISTANCE SPECIFIED CONDITION

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.

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

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

2009 Toyota Tundra

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