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Toyota Tundra. Manual - part 1612

A/F Sensor - Low Impedance

TYPICAL ENABLING CONDITIONS - A/F SENSOR - LOW IMPEDANCE

A/F Sensor - Short Circuit Between AF+ and AF-, GND

TYPICAL ENABLING CONDITIONS - A/F SENSOR - SHORT CIRCUIT BETWEEN AF+ AND AF-,
GND

Estimated sensor temperature

450 to 550°C (842 to 1022°F) for P2237 and P2240

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)

Engine coolant temperature

0°C (0°F) or higher

Estimated sensor temperature

700 to 800°C (1292 to 1472°F) for P2238 and P2241

Fuel cut

Not executed

Monitor runs whenever following
DTCs not present

2009 Toyota Tundra

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

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

Page 541

Other

TYPICAL ENABLING CONDITIONS - OTHER

TYPICAL MALFUNCTION THRESHOLDS

P2237 and P2240:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS - P2237 AND P2240

P2238 and P2241:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS - P2238 AND P2241

P2239 and P2242:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS - P2239 AND P2242

P2252 and P2255:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS - P2252 AND P2255

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 higher

Ignition switch

Timing after ignition switch off to
ON

5 seconds or more

Battery voltage

11 V or higher

Ignition switch

Timing after ignition switch off to ON

5 seconds or more

A/F sensor admittance

Below 0.002 1/ohms

When one of following conditions is met:

Condition 1, 2 or 3

1. Sensor admittance

Less than 0.022 Mohms

2. AF+ voltage

0.5 V or less

3. Difference of AF+ and AF- voltage

0.1 V or less

AF+ voltage

More than 4.5 V

2009 Toyota Tundra

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

Saturday, June 19, 2010 7:34:45 PM

Page 542

P2253 and P2256:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS - P2253 AND P2256

WIRING DIAGRAM

Refer to DTC P2195 .

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data
from the time the malfunction occurred.

1. CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM) (See INSPECTION

PROCEDURE )

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

2. REPLACE AIR FUEL RATIO SENSOR

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

3. CHECK WHETHER DTC OUTPUT RECURS

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON and turn the Techstream ON.

c. Clear DTCs (see DTC CHECK/CLEAR ).

d. Start the engine.

e. Allow the engine to idle for 5 minutes or more.

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

g. Read pending DTCs.

Result

DTC OUTPUT RESULT

AF- voltage

0.5 V or less

AF- voltage

More than 4.5 V

Result

Proceed to

No DTC is output

P2237, P2238, P2239, P2240, P2241, P2242, P2252, P2253, P2255 or P2256 is output

2009 Toyota Tundra

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

Saturday, June 19, 2010 7:34:45 PM

Page 543

B: REPLACE ECM (See REMOVAL )

A: END

DTC P2420 EVAPORATIVE EMISSION SYSTEM SWITCHING VALVE CONTROL CIRCUIT
HIGH

DTC SUMMARY

DTC CHART

HINT:

The vent valve is built into the canister pump module.

DESCRIPTION

The description can be found in the EVAP (Evaporative Emission) System (see DESCRIPTION ).

INSPECTION PROCEDURE

Refer to the EVAP SYSTEM .

MONITOR DESCRIPTION

5 hours* after the ignition switch is turned off, the leak detection pump creates negative pressure (vacuum) in
the EVAP system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure.

HINT:

*: If the engine coolant temperature is not below 35°C (95°F) 5 hours after the ignition switch is turned off, the
monitor check starts 2 hours later. If it is still not below 35°C (95°F) 7 hours after the ignition switch is turned
off, the monitor check starts 2.5 hours later.

OPERATION DESCRIPTION CHART

DTC

Monitoring

Item

Malfunction Detection

Condition

Trouble Area

Detection

Timing

Detection

Logic

P2420

Vent valve
stuck open
(vent)

Following condition met
during key-off EVAP
monitor:



EVAP pressure
change when vent
valve closed (ON)
less than 0.3 kPa-g
(2.25 mmHg-g)



Canister pump module
(Reference orifice, leak
detection pump, vent
valve)



Connector/wire harness
(Canister pump module
- ECM)



ECM

While
ignition
switch off

2 trip

Sequence

Operation

Description

Duration

2009 Toyota Tundra

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

Saturday, June 19, 2010 7:34:45 PM

Page 544

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