Toyota Tundra. Manual — part 1206

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

Related DTCs

P0420: Catalyst Deterioration
P0430: Catalyst Deterioration

Required Sensors/Components
(Main)

A/F sensor and heated oxygen sensor

Required Sensors/Components
(Related)

Intake air temperature sensor, mass air flow meter, crankshaft position
sensor and engine coolant temperature sensor

Frequency of Operation

Once per driving cycle

Duration

About 30 seconds

MIL Operation

2 driving cycles

Sequence of Operation

None

Monitor runs whenever following DTCs not
present

P0011 (VVT System 1 - Advance)
P0012 (VVT System 1 - Retard)
P0021 (VVT System 2 - Advance)
P0022 (VVT System 2 - Retard)
P0031, P0032, P0051, P0052 (A/F sensor heater -
Sensor 1)
P0037, P0038, P0057, P0058 (HO2 sensor Heater -
Sensor 2)
P0102 - P0103 (MAF meter)
P0115 - P0118 (ECT sensor)
P0120 - P0223, P2135 (TP sensor)
P0125 (Insufficient ECT for closed loop)
P0136, P0156 (HO2 Sensor - Sensor 2)
P0171, P0172, P0174, P0175 (Fuel system)
P0300 - P0306 (Misfire)
P0335 (CKP sensor)
P0340 (VVT sensor)
P0351 - P0356 (Igniter)
P0500 (VSS)
P2196, P2198 (A/F sensor - rationality)
P2A00, P2A03 (A/F sensor - slow response)

Battery voltage

11 V or more

IAT

-10°C (14°F) or more

Engine coolant temperature sensor

75°C (167°F) or more

Atmospheric pressure coefficient

76 kPa (570 mmHg) or more

Idling

OFF

Engine RPM

Less than 3200 RPM

A/F sensor status

Activated

Fuel system status

Closed loop

Engine load

10 to 80%

All of the following conditions are met

Condition 1, 2 and 3

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

MONITOR RESULT

Refer to CHECKING MONITOR STATUS .

CONFIRMATION DRIVING PATTERN

HINT:

Performing this confirmation pattern will activate the catalyst monitor. This is very useful for verifying the
completion of a repair.

Fig. 146: Confirmation Driving Pattern

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON.

c. Turn the Techstream ON.

d. Clear DTCs (if set) (See DTC CHECK/CLEAR ).

e. Enter the following menus: Powertrain/Engine and ECT/Monitor.

1. Mass air flow rate

5 to 70 g/sec.

2. Front catalyst temperature (estimated)

600 to 840°C (1112 to 1544°F)

3. Rear catalyst temperature (estimated)

100 to 900°C (212 to 1652°F)

Rear HO2 sensor monitor

Completed

Shift position

4th or higher

Oxygen Storage Capacity (OSC) of Three-Way Catalytic Converter (TWC)

Less than 0.008 g

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

f. Check that Catalyst/Status2 is Incomplete.

g. Start the engine and warm it up.

h. Drive the vehicle at between 40 mph and 70 mph (64 km/h and 113 km/h) for at least 10 minutes.

i. Those items will change to Complete as Catalyst monitor operates.

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

k. Check if any DTCs (any pending DTCs) are set.

HINT:

If Catalyst does not change to Complete, and any pending DTCs fail to set, extend the driving time.

CONDITIONING FOR SENSOR TESTING

HINT:

Perform the operation with the engine speeds and time durations described below prior to checking the
waveforms of the A/F and HO2 sensors. This is in order to activate the sensors sufficiently to obtain the
appropriate inspection results.

Fig. 147: Confirmation Driving Pattern For Sensor Testing

a. Connect the Techstream to the DLC3.

b. Start the engine and warm it up with all the accessories switched OFF until the engine coolant

temperature stabilizes.

c. Run the engine at an engine speed of between 2500 RPM and 3000 RPM for at least 3 minutes.

d. While running the engine at 3000 RPM for 2 seconds and 2000 RPM for 2 seconds, check the waveforms

of the A/F and HO2 sensors using the Techstream.

HINT:



If either of the voltage outputs of the Air-Fuel Ratio (A/F) or Heated Oxygen (HO2) sensor does not

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

fluctuate, or either of the sensors makes a noise, the sensor may be malfunctioning.



If the voltage outputs of both the sensors remain lean or rich, the air-fuel ratio may be extremely lean or
rich. In such cases, enter the following menus: Powertrain/Engine and ECT/Active Test/Control the
Injection Volume for A/F sensor.



If the Three-Way Catalytic Converter (TWC) has deteriorated, the HO2 sensor (located behind the TWC)
voltage output fluctuates up and down frequently, even under normal driving conditions (active air-fuel
ratio control is not performed).

Fig. 148: Voltage Outputs Graph Of Air-Fuel Ratio (A/F) Or Heated Oxygen (HO2) Sensor

INSPECTION PROCEDURE

HINT:

Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F sensor function
provided in the Active Test. The Control the Injection Volume for A/F sensor function can help to determine
whether the Air-Fuel Ratio (A/F) sensor, Heated Oxygen (HO2) sensor and other potential trouble areas are
malfunctioning.

The following instructions describe how to conduct the Control the Injection Volume for A/F sensor operation
using the Techstream.

1. Connect the Techstream to the DLC3.

2. Start the engine and turn the Techstream ON.

3. Warm up the engine at an engine speed of 2500 RPM for approximately 90 seconds.

4. Oh the Techstream, enter the following menus: Powertrain/Engine and ECT/Active Test/Control the

Injection Volume for A/F sensor.

5. Perform the Active Test operation with the engine in an idling condition (press the RIGHT or LEFT

button to change the fuel injection volume.)

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra