Toyota Tundra. Manual — part 1353

Heated Oxygen Sensor Output Voltage (Abnormal Voltage Output, High Voltage and Low Voltage):

TYPICAL ENABLING CONDITIONS - HEATED OXYGEN SENSOR OUTPUT VOLTAGE
(ABNORMAL VOLTAGE OUTPUT, HIGH VOLTAGE AND LOW VOLTAGE)

Heated Oxygen Sensor Impedance (Low):

TYPICAL ENABLING CONDITIONS - HEATED OXYGEN SENSOR IMPEDANCE (LOW)

Heated Oxygen Sensor Impedance (High):

TYPICAL ENABLING CONDITIONS - HEATED OXYGEN SENSOR IMPEDANCE (HIGH)

Heated Oxygen Sensor Output Voltage (Extremely High):

present

P0335 (CKP sensor)
P0455, P0456 (EVAP system)
P0500 (VSS)
P2196, P2198 (A/F sensor - rationality)
P2237, P2240 (A/F sensor - open)
P2440 (AIR control valve stuck open)
P2441 (AIR control valve stuck close)
P2444 (AIP stuck On)
P2445 (AIP stuck Off)
P2A00, P2A03 (A/F sensor - slow response)

Active air-fuel ratio control

Executing

Active air-fuel ratio control begins when all of following conditions met:

-

Battery voltage

11 V or higher

Engine coolant temperature

75°C (167°F) or higher

Idling

OFF

Engine RPM

Less than 3200 RPM

A/F sensor status

Activated

Fuel system status

Closed loop

Fuel cut

OFF

Engine load

10 to 70%

Shift position

4th or higher

Battery voltage

11 V or higher

Estimated rear HO2 sensor temperature

Less than 700°C (1292°F)

DTC P0607

higher

Battery voltage

11 V or higher

Estimated rear HO2 sensor temperature

450 to 750°C (842 to 1382°F)

ECM monitor

Completed

DTC P0607

Not set

2008 Toyota Tundra

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

TYPICAL ENABLING CONDITIONS - HEATED OXYGEN SENSOR OUTPUT VOLTAGE
(EXTREMELY HIGH)

Heated Oxygen Sensor Output Voltage during fuel cut:

TYPICAL ENABLING CONDITIONS - HEATED OXYGEN SENSOR OUTPUT VOLTAGE DURING
FUEL CUT

TYPICAL MALFUNCTION THRESHOLDS

Heated Oxygen Sensor Output Voltage (Abnormal Voltage Output):

TYPICAL MALFUNCTION THRESHOLDS - HEATED OXYGEN SENSOR OUTPUT VOLTAGE
(ABNORMAL VOLTAGE OUTPUT)

Heated Oxygen Sensor Output Voltage (Low):

TYPICAL MALFUNCTION THRESHOLDS - HEATED OXYGEN SENSOR OUTPUT VOLTAGE
(LOW)

Heated Oxygen Sensor Output Voltage (High):

TYPICAL MALFUNCTION THRESHOLDS - HEATED OXYGEN SENSOR OUTPUT VOLTAGE
(HIGH)

Battery voltage

11 V or higher

Time after engine start

2 seconds or more

Engine coolant temperature

75°C (167°F) or higher

Estimated catalyst temperature

620°C (1148°F) or higher

Fuel cut

ON

Either of following conditions met:

1 or 2

1. All of following conditions (a), (b) and (c) met

-

(a) Commanded air-fuel ratio

14.3 or less

(b) Rear HO2 sensor voltage

0.21 to 0.59 V

(c) OSC (Oxygen Storage Capacity of Catalyst)

2 g or more

2. All of following conditions (d), (e) and (f) met

-

(d) Commanded air-fuel ratio

14.9 or more

(e) Rear HO2 sensor voltage

0.21 to 0.59 V

(f) OSC

2 g or more

All of following conditions (a), (b) and (c) met

-

(a) Commanded air-fuel ratio

14.3 or less

(b) Rear HO2 sensor voltage

Less than 0.21 V

(c) OSC

2 g or more

All of following conditions (a), (b) and (c) met

-

(a) Commanded air-fuel ratio

14.9 or more

2008 Toyota Tundra

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

Heated Oxygen Sensor Impedance (Low):

TYPICAL MALFUNCTION THRESHOLDS - HEATED OXYGEN SENSOR IMPEDANCE (LOW)

Heated Oxygen Sensor Impedance (High):

TYPICAL MALFUNCTION THRESHOLDS - HEATED OXYGEN SENSOR IMPEDANCE (HIGH)

Heated Oxygen Sensor Output Voltage (Extremely High):

TYPICAL MALFUNCTION THRESHOLDS - HEATED OXYGEN SENSOR OUTPUT VOLTAGE
(EXTREMELY HIGH)

Heated Oxygen Sensor Output Voltage during fuel cut:

TYPICAL MALFUNCTION THRESHOLDS - HEATED OXYGEN SENSOR OUTPUT VOLTAGE
DURING FUEL CUT

COMPONENT OPERATING RANGE

COMPONENT OPERATING RANGE

MONITOR RESULT

Refer to CHECKING MONITOR STATUS .

WIRING DIAGRAM

(b) Rear HO2 sensor voltage

Higher than 0.59 V

(c) OSC

2 g or more

Duration of following condition met

30 seconds or more

Heated oxygen sensor impedance

Less than 5 ohms

Duration of following condition met

90 seconds or more

Heated oxygen sensor impedance

15 kohms or higher

Duration of following condition met

10 seconds or more

Heated oxygen sensor voltage

1.2 V or higher

Duration until rear heated oxygen sensor voltage drops to 0.2 V during fuel cut

9.3 seconds or more

Duration of following condition met

30 seconds or more

Heated oxygen sensor voltage

Varies between 0.1 and 0.9 V

2008 Toyota Tundra

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

Fig. 85: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2) - Wiring Diagram

CONFIRMATION DRIVING PATTERN

HINT:



This confirmation driving pattern is used in the "PERFORM CONFIRMATION DRIVING PATTERN"
procedure of the following diagnostic troubleshooting procedure.



Performing this confirmation driving pattern will activate the Heated Oxygen (HO2) sensor monitor. (The
catalyst monitor is performed simultaneously.) This is very useful for verifying the completion of a
repair.

NOTE:

This test will not be completed if the vehicle is driven under absolutely constant
speed conditions such as with cruise control activated.

2008 Toyota Tundra

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