Toyota Tundra. Manual — part 1420

constant voltage result.

NG : Go to step 9

OK : Go to Next Step

4. PERFORM CONFIRMATION DRIVING PATTERN

5. 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

RESULT REFERENCE

B : END

A : Go to Next Step

6. REPLACE AIR FUEL RATIO SENSOR

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

RESULT REFERENCE

B : REPLACE ECM (See REMOVAL )

A : END

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

Result

Proceed To

P2195, P2196, P2197 or P2198 is output

A

No DTC is output

B

Result

Proceed To

No DTC is output

A

P2195, P2196, P2197 or P2198 is output

B

2008 Toyota Tundra

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

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

STANDARD VOLTAGE SPECIFICATION

d. Turn the ignition switch off.

e. Disconnect the D74 ECM connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

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

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 (HA1A) 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

2008 Toyota Tundra

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

Fig. 223: Identifying D74 ECM, D33 & D34 A/F Sensor Connectors

Fig. 224: Oxygen (A/F) Sensor - System Diagram

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

Always

10 kohms or higher

2008 Toyota Tundra

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

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : Go to Next Step

12. REPLACE AIR FUEL RATIO SENSOR

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

13. PERFORM CONFIRMATION DRIVING PATTERN

14. 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

RESULT REFERENCE

B : REPLACE ECM (See REMOVAL )

A : END

DTC P2237 OXYGEN (A/F) SENSOR PUMPING CURRENT CIRCUIT/OPEN (BANK 1 SENSOR 1);
DTC P2238 OXYGEN (A/F) SENSOR PUMPING CURRENT CIRCUIT LOW (BANK 1 SENSOR 1);
DTC P2239 OXYGEN (A/F) SENSOR PUMPING CURRENT CIRCUIT HIGH (BANK 1 SENSOR 1);
DTC P2240 OXYGEN (A/F) SENSOR PUMPING CURRENT CIRCUIT/OPEN (BANK 2 SENSOR 1);
DTC P2241 OXYGEN (A/F) SENSOR PUMPING CURRENT CIRCUIT LOW (BANK 2 SENSOR 1);
DTC P2242 OXYGEN (A/F) SENSOR PUMPING CURRENT CIRCUIT HIGH (BANK 2 SENSOR 1);
DTC P2252 OXYGEN (A/F) SENSOR REFERENCE GROUND CIRCUIT LOW (BANK 1 SENSOR 1);
DTC P2253 OXYGEN (A/F) SENSOR REFERENCE GROUND CIRCUIT HIGH (BANK 1 SENSOR 1);
DTC P2255 OXYGEN (A/F) SENSOR REFERENCE GROUND CIRCUIT LOW (BANK 2 SENSOR 1);
DTC P2256 OXYGEN (A/F) SENSOR REFERENCE GROUND CIRCUIT HIGH (BANK 2 SENSOR 1)

DESCRIPTION

Refer to DTC P2195 .

DTC DETECTION CONDITION AND TROUBLE AREA

Result

Proceed To

No DTC is output

A

P2195, P2196, P2197 or P2198 is output

B

DTC

Code

DTC Detection Condition

Trouble Area

P2237
P2240

Open in the circuit between terminals AF+ and AF- of the
A/F sensor while engine is running (2 trip detection logic)



Open in Air Fuel Ratio (A/F)
sensor (for bank 1, 2 sensor 1)
circuit

2008 Toyota Tundra

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