Toyota Tundra. Manual — part 1611

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

DTC OUTPUT RESULT

B: REPLACE ECM (See REMOVAL )

A: END

15. CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST

NO: CHECK INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT
PROBLEMS )

YES: DTC CAUSED BY RUNNING OUT OF FUEL

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 REFERENCE CHART

Result

Proceed to

No DTC is output

A

P2195 P2196 P2197 or P2198 is output

B

DTC

DTC Detection Condition

Trouble Area

2009 Toyota Tundra

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

P2237
P2240

Open in the circuit between

erminals AF and AF- of the A/F

ensor while engine is running (2

rip detection logic)



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



Air Fuel Ratio (A/F) sensor
(for Bank 1, 2 Sensor 1)



ECM

P2238
P2241



Case 1:

Condition (a) or (b) continues
for 5.0 seconds or more (2
trip detection logic):

a. AF voltage 0.5 V or

less

b. (AF ) - (AF-) 0.1 V

or less



Case 2:

A/F sensor admittance: Less
than 0.022 1/ohms (2 trip
detection logic)



Open or short in A/F sensor
(for Bank 1, 2 Sensor 1)
circuit



A/F sensor (for Bank 1, 2
Sensor 1)



A/F sensor heater (for Bank
1, 2 Sensor 1)



A/F relay A/F sensor heater
and relay circuits



ECM

P2239
P2242

AF voltage more than 4.5 V for
5.0 seconds or more (2 trip
detection logic)



Open or short in A/F sensor
(for Bank 1, 2 Sensor 1)
circuit



A/F sensor (for Bank 1, 2
Sensor 1)



A/F sensor heater (for Bank
1, 2 Sensor 1)



A/F relay A/F sensor heater
and relay circuits



ECM

P2252
P2255

AF- voltage 0.5 V or less for 5.0

econds or more (2 trip detection

ogic)



Open or short in A/F sensor
(for Bank 1, 2 Sensor 1)
circuit



A/F sensor (for Bank 1, 2
Sensor 1)



A/F sensor heater (for Bank
1, 2 Sensor 1)



A/F relay



A/F sensor heater and relay
circuits



ECM

2009 Toyota Tundra

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

HINT:



DTCs P2237, P2238, P2239, P2252 and P2253 indicate malfunctions related to the bank 1 A/F sensor
circuit.



DTCs P2240, P2241, P2242, P2255 and P2256 indicate malfunctions related to the bank 2 A/F sensor
circuit.



Bank 1 refers to the bank that includes No. 1 cylinder.



Bank 2 refers cylinder, to the bank that includes No. 2 cylinder.

MONITOR DESCRIPTION

These DTCs are output when there is an open or short in the A/F sensor circuit, or if A/F sensor output drops.

To detect these problems, the voltage of the A/F sensor is monitored when turning the ignition switch to the ON
position, and the admittance (admittance is an electrical term that indicates the ease of flow of current) is
checked while driving. If the voltage of the A/F sensor is between 0.6 V and 4.5 V, it is considered normal. If
the voltage is outside of the specified range, or the admittance is less than the standard value, the ECM will
determine that there is a malfunction in the A/F sensor. If the same malfunction is detected in the next driving
cycle, the MIL is illuminated and a DTC is stored.

The Air-Fuel Ratio (A/F) sensor varies its output voltage in proportion to the air-fuel ratio. If the A/F sensor
impedance (alternating current resistance) or output voltage deviates greatly from the standard range, the ECM
determines that there is an open or short in the A/F sensor circuit.

MONITOR STRATEGY

MONITOR STRATEGY

P2253
P2256

AF- voltage more than 4.5 V for
5.0 seconds or more (2 trip
detection logic)



Open or short in A/F sensor
(for Bank 1, 2 Sensor 1)
circuit



A/F sensor (for Bank 1, 2
Sensor 1)



A/F sensor heater (for Bank
1, 2 Sensor 1)



A/F relay A/F sensor heater
and relay circuits



ECM

Related DTCs

P2237: A/F sensor (for Bank 1) open circuit between AF+ and AF-
P2238: A/F sensor (for Bank 1) short circuit between AF+ and AF-
P2238: A/F sensor (for Bank 1) short circuit between AF+ and GND
P2238: A/F sensor (for Bank 1) low impedance
P2239: A/F sensor (for Bank 1) short circuit between AF+ and +B
P2240: A/F sensor (for Bank 2) open circuit between AF+ and AF-
P2241: A/F sensor (for Bank 2) short circuit between AF+ and AF-

2009 Toyota Tundra

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

Saturday, June 19, 2010 7:34:44 PM

Page 539

© 2006 Mitchell Repair Information Company, LLC.

TYPICAL ENABLING CONDITIONS

A/F Sensor - Open Circuit Between AF+ and AF-

TYPICAL ENABLING CONDITIONS - A/F SENSOR - OPEN CIRCUIT BETWEEN AF+ AND AF-

P2241: A/F sensor (for Bank 2) short circuit between AF+ and GND
P2241: A/F sensor (for Bank 2) low impedance
P2242: A/F sensor (for Bank 2) short circuit between AF+ and +B
P2252: A/F sensor (for Bank 1) short circuit between AF- and GND
P2253: A/F sensor (for Bank 1) short circuit between AF- and +B
P2255: A/F sensor (for Bank 2) short circuit between AF- and GND
P2256: A/F sensor (for Bank 2) short circuit between AF- and +B

Required Sensors/Components
(Main)

A/F sensor

Required Sensors/Components
(Related)

Engine Coolant Temperature (ECT) sensor, Crankshaft position
sensor

Frequency of Operation

Continuous

Duration

10 seconds: A/F sensor open circuit between AF+ and AF- and Low
impedance 5 seconds: Other

MIL Operation

2 driving cycles

Sequence of Operation

None

Monitor runs whenever following
DTCs not present

P0016, P0018 (VVT System - Misalignment)
P0017, P0019 (Exhaust VVT System - Misalignment)
P0031, P0032, P0051, P0052 (Air Fuel Ratio Sensor Heater)
P0102, P0103 (Mass Air Flow Sensor)
P0112, P0113 (Intake Air Temperature Sensor)
P0115, P0117, P0118 (Engine Coolant Temperature Sensor)
P0125 (Insufficient Coolant Temperature for Closed Loop Fuel
Control)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135
(Throttle Position Sensor)
P0128 (Thermostat)
P0171, P0172, P0174, P0175 (Fuel System)
P0301 - P0308 (Misfire)
P0335 (Crankshaft Position Sensor) P1340 (Camshaft Position
Sensor)
P0451, P0452, P0453 (EVAP System)
P0412, P0415, P0418, P0419, P1613, P1614 (Secondary Air
Injection System Control)
P2440, P2441, P2442, P2443, P2444, P2445, P2446, P2447
(Secondary Air Injection System)
P0500, P0722 (Vehicle Speed Sensor)
P0505 (IAC Valve)

Battery voltage

11 V or more

Engine

Running

2009 Toyota Tundra

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

Saturday, June 19, 2010 7:34:44 PM

Page 540

© 2006 Mitchell Repair Information Company, LLC.