Toyota Tundra. Manual — part 1610

a. Replace the air fuel ratio sensor (see REMOVAL ).

7. PERFORM CONFIRMATION DRIVING PATTERN

8. CHECK WHETHER DTC OUTPUT RECURS (DTC P2195, P2196, P2197 OR P2198)

a. Read DTCs using the Techstream.

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

c. Read pending DTCs.

Result

DTC OUTPUT RESULT

B: REPLACE ECM (See REMOVAL )

A: END

9. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) (See INSPECTION

PROCEDURE )

NG: REPLACE AIR FUEL RATIO SENSOR (See REMOVAL )

OK: Go to Next Step

10. INSPECT INTEGRATION RELAY (A/F) (See INSPECTION PROCEDURE )

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

OK: Go to Next Step

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

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

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

d. Turn the ignition switch off.

Result

Proceed to

No DTC is output

A

P2195 P2196 P2197 or P2198 is output

B

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

2009 Toyota Tundra

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

e. Disconnect the D74 ECM connector.

Fig. 239: Identifying D33 Or D34 A/F Sensor With D74 ECM Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2009 Toyota Tundra

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

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

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection

Condition Specified Condition

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

Always

Below 1 ohms

D33-3 (A1A ) - D74-126 (A1A )

Always

Below 1 ohms

D33-4 (A1A-) - D74-125 (A1A-)

Always

Below 1 ohms

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

Always

Below 1 ohms

D34-3 (A2A ) - D74-103 (A2A )

Always

Below 1 ohms

D34-4 (A2A-) - D74-102 (A2A-)

Always

Below 1 ohms

D33-1 (HA1 A) or D74-22 (HA1A) - Body ground Always

10 kohms or higher

D33-3 (A1A ) or D74-126 (A1A ) - Body ground Always

10 kohms or higher

D33-4 (A1A-) or D74-125 (A1A-) - Body ground

Always

10 kohms or higher

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

Always

10 kohms or higher

D34-3 (A2A ) or D74-103 (A2A ) - Body ground Always

10 kohms or higher

D34-4 (A2A-) or D74-102 (A2A-) - Body ground

Always

10 kohms or higher

2009 Toyota Tundra

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

Fig. 240: A/F Sensor System Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR