Toyota Tundra. Manual — part 1621

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The pressure indicated by the pressure sensor exceeds threshold levels despite the ECM turning off the air
pump.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

All:

TYPICAL ENABLING CONDITIONS - ALL

Related DTCs

P2444: Air pump stuck ON
P2445: Air pump stuck OFF
P2446: Air pump stuck ON
P2447: Air pump stuck OFF

Required Sensors/Components (Main)

Pressure sensor

Required Sensors/Components (Related)

-

Frequency of Operation

Once per drive cycle

Duration

7 seconds

MIL Operation

2 driving cycles

Sequence of Operation

None

Monitor runs whenever
following DTCs not present

P0010, P0020 (VVT Oil Control Valve)
P0011, P0021 (VVT System - Advance)
P0012, P0022 (VVT System - Retard)
P0016, P0018 (VVT System - Misalignment)
P0013, P0023 (Exhaust VVT Oil Control Valve)
P0014, P0024 (Exhaust VVT System - Advance)
P0015, P0025 (Exhaust VVT System - Retard)
P0017, P0019 (Exhaust VVT System - Misalignment)
P0031, P0032, P0051, P0052 (Air Fuel Ratio Sensor Heater)
P2195, P2196, P2197, P2198, P2237, P2238, P2239, P2240, P2241,
P2242, P2252, P2253, P2255, P2256, P2A00, P2A03 (Air Fuel Ratio
Sensor)
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)
P0171, P0172, P0174, P0175 (Fuel System)
P0301 - P0308 (Misfire)
P0327, P0328, P0332, P0333, P032C, P032D, P033C, P033D (Knock
Sensor)
P0335 (Crankshaft Position Sensor) P1340 (Camshaft Position Sensor)
P0340, P0342, P0343, P0345, P0347, P0348 (VVT Sensor)

2009 Toyota Tundra

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

Saturday, June 19, 2010 7:34:46 PM

Page 577

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Case 1:

TYPICAL ENABLING CONDITIONS - CASE 1

Case 2:

TYPICAL ENABLING CONDITIONS - CASE 2

TYPICAL MALFUNCTION THRESHOLDS

Condition 1:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS 1

Condition 2:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS 2

Condition 3:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS 3

Condition 4:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS 4

P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT Sensor)
P0351 - P0358 (Igniter)
P0451, P0452, P0453 (EVAP System)
P0500, P0722 (Vehicle Speed Sensor)
P2431, P2432, P2433, P2436, P2437, P2438 (Secondary Air Injection
System Pressure Sensor)

Battery voltage

11 V or more

Atmospheric pressure

45 kPa (337.5 mmHg) or more

Secondary air injection pump

ON

Secondary air injection switching valve

ON

Engine speed

Less than 3750 RPM

Secondary air injection pump

OFF

Engine speed

Less than 3000 RPM

Secondary air injection system monitor during secondary air injection ON

Completed

AIR pressure during AIR ON

2.4 kPa or more and pulse is generated

AIR pressure during AIR ON

Less than 2.4 kPa and pulse is generated

AIR pressure during AIR ON

2.4 kPa or more and pulse is not generated

AIR pressure during AIR ON

Less than 2.4 kPa and pulse is not generated

2009 Toyota Tundra

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

Saturday, June 19, 2010 7:34:46 PM

Page 578

© 2006 Mitchell Repair Information Company, LLC.

Condition 5:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS 5

Condition 6:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS 6

Condition 7:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS 7

Condition 8:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS 8

Criteria A:

TYPICAL MALFUNCTION THRESHOLDS CRITERIA A

Criteria B:

TYPICAL MALFUNCTION THRESHOLDS CRITERIA B

Criteria C:

TYPICAL MALFUNCTION THRESHOLDS CRITERIA C

MONITOR RESULT

Refer to CHECKING MONITOR STATUS .

WIRING DIAGRAM

AIR pressure during AIR OFF

2.4 kPa or more and pulse is generated

AIR pressure during AIR OFF

Less than 2.4 kPa and pulse is generated

AIR pressure during AIR OFF

2.4 kPa or more and pulse is not generated

AIR pressure during AIR OFF

Less than 2.4 kPa and pulse is not generated

Both of following conditions met:

(a) and (b)

(a) Not condition 6

Met

(b) Not condition 8

Met

Both of following conditions met:

(a) and (b)

(a) Not condition 1

Met

(b) Not condition 3

Met

AIR amount

140 L/min or less

2009 Toyota Tundra

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

Saturday, June 19, 2010 7:34:46 PM

Page 579

© 2006 Mitchell Repair Information Company, LLC.

Refer to DTC P0412 .

INSPECTION PROCEDURE

HINT:

Determination by ECM monitoring:

The ECM locates malfunctions in the Secondary Air Injection (AIR) system by detecting the pressure in the
AIR passage between the air pump and Air Switching Valve (ASV) and stores a DTC. Soon after cold engine
starts, the monitor runs for a short time while the AIR system is both ON and OFF. The ECM detects both the
pressure and the exhaust pulsation and compares them.

The following 8 patterns are AIR system pressure conditions in the AIR system passage.

Pressure Condition in Secondary Air Injection System Case 1:

PRESSURE CONDITION IN SECONDARY AIR INJECTION SYSTEM CASE 1

Pressure Condition in Secondary Air Injection System Case 2:

PRESSURE CONDITION IN SECONDARY AIR INJECTION SYSTEM CASE 2

Pressure Condition in Secondary Air Injection System Case 3:

PRESSURE CONDITION IN SECONDARY AIR INJECTION SYSTEM CASE 3

Pressure Condition in Secondary Air Injection System Case 4:

PRESSURE CONDITION IN SECONDARY AIR INJECTION SYSTEM CASE 4

Air Pump

ON

Air Switching Valve

Open

Pressure

2.4 kPa or more

Pulsation Detection

Exhaust gas pulsation detected

Air Pump

OFF

Air Switching Valve

Open

Pressure

Less than 2.4 kPa

Pulsation Detection

Exhaust gas pulsation detected

Air Pump

ON

Air Switching Valve

Closed

Pressure

2.4 kPa or more

Pulsation Detection

Exhaust gas pulsation not detected

Air Pump

OFF

Air Switching Valve

Close

2009 Toyota Tundra

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

Saturday, June 19, 2010 7:34:46 PM

Page 580

© 2006 Mitchell Repair Information Company, LLC.