Toyota Tundra. Manual — part 1382

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

Related DTCs

P0430: Catalyst Deterioration (bank 2)

Required Sensors/Components
(Main)

A/F sensor and HO2 sensor

Required Sensors/Components
(Related)

Intake air temperature sensor, mass airflow 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 (O2 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 (O2 Sensor - Sensor 2)
P0171, P0172 (Fuel system)
P0300 - P0308 (Misfire)
P0335 (CKP sensor)
P0351 - P0358 (Igniter)
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)

Battery voltage

11 V or higher

Intake air temperature

-10°C (14°F) or more

Engine coolant temperature

75°C (167°F) or more

Atmospheric pressure

76 kPa (570 mmHg) or more

Idling

OFF

Engine RPM

Less than 3200 RPM

A/F sensor status

Activated

2008 Toyota Tundra

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

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

For Mexico Models:

TYPICAL MALFUNCTION THRESHOLDS - FOR MEXICO MODELS

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.

Fuel system status

Closed loop

Engine load

10 to 70%

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

-

(a) Mass air flow rate

6 to 75 g/sec.

(b) Estimated front catalyst temperature

620 to 830°C (1148 to 1526°F)

(c) Estimated rear catalyst temperature

410 to 830°C (770 to 1526°F)

Rear HO2 sensor heater monitor

Completed

Shift position

4th or higher

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

Less than 0.12 g

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

Less than 0.11 g

2008 Toyota Tundra

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

Fig. 149: Vehicle Speed Graph

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Turn the Techstream ON.

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

e. Enter the following menus: Powertrain/Engine and ECT/Data List/All/Catalyst Monitor CMPL.

f. Check that Catalyst Monitor CMPL is incomplete.

g. Start the engine and warm it up.

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

i. Note the state of the Readiness Tests items. Those items will change to Complete as Catalyst Monitor

CMPL 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 Monitor CMPL 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.

2008 Toyota Tundra

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

Fig. 150: Engine Speed Graph

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 and 2000 RPM at 2 second intervals, check the waveforms of the

A/F and HO2 sensors using the Techstream.

HINT:



If either voltage output of the Air-Fuel Ratio (A/F) or Heated Oxygen (HO2) sensor does not
fluctuate, or there is a noise in the waveform of either sensor, 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, perform the following Control the Injection Volume for A/F Sensor
using the Techstream.



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).

2008 Toyota Tundra

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