Toyota Tundra. Manual — part 1617

Case 3:

TYPICAL ENABLING CONDITIONS - CASE 3

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

Condition 5:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS - 5

Condition 6:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS - 6

Secondary air injection pump

OFF

Engine speed

Less than 3000 RPM

Secondary air injection system monitor during secondary air injection ON

Completed

Cumulative intake air amount

100g/sec. or more

Engine speed

Less than 3750 RPM

AIR pump

OFF

AIR valve

OFF

AIR status

OFF

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

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

2009 Toyota Tundra

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

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

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Condition 7:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS - 7

Condition 8:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS - 8

Case 1:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS - CASE 1

Case 2:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS - CASE 2

Case 3:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS - CASE 3

MONITOR RESULT

Refer to CHECKING MONITOR STATUS .

WIRING DIAGRAM

Refer to DTC P0412 .

INSPECTION PROCEDURE

HINT:

Determination by ECM monitoring:

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

Any of following conditions met:

(a), (b) or (c)

(a) Conditions 1 and 6

Met

(b) Conditions 1 and 5

Met

(c) Conditions 2 and 6

Met

Any of following conditions met:

(a), (b) or (c)

(a) Conditions 3 and 7

Met

(b) Conditions 3 and 8

Met

(c) Conditions 4 and 8

Met

Cumulative pressure pulsation

60 kPa or more

2009 Toyota Tundra

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

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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

Pressure Condition in Secondary Air Injection System Case 5:

PRESSURE CONDITION IN SECONDARY AIR INJECTION SYSTEM CASE 5

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

Pressure

Less than 2.4 kPa

Pulsation Detection

Exhaust gas pulsation not detected

Air Pump

ON

Air Switching Valve

Open

2009 Toyota Tundra

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

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

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Pressure Condition in Secondary Air Injection System Case 6:

PRESSURE CONDITION IN SECONDARY AIR INJECTION SYSTEM CASE 6

Pressure Condition in Secondary Air Injection System Case 7:

PRESSURE CONDITION IN SECONDARY AIR INJECTION SYSTEM CASE 7

Pressure Condition in Secondary Air Injection System Case 8:

PRESSURE CONDITION IN SECONDARY AIR INJECTION SYSTEM CASE 8

If the detected pressure is high, the air pump is assumed to be ON and if it alternates sharply, the ASV is
assumed to be open. The ECM locates malfunctions from the combination of pressures detected when the AIR
system is ON and OFF.

HINT:

The exhaust pulsation value is calculated in the ECM. If the calculated value exceeds a certain level, the ECM
determines that the exhaust pulsation is in the AIR system.

HINT:



In case 3 and 7, as the pressure sensor detects a slight pump operation pulsation, the detected value is not
constant. Since the pump outlet is blocked by closing the ASV, the average pressure is higher than in case
1 (approximately 20 to 30 kPa).



In case 1, the average pressure is approximately 3 to 11 kPa. The value of 2.4 kPa indicated in the table
above is a threshold for detecting pump malfunctions.

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

Pressure

Less than 2.4 kPa

Pulsation Detection

Exhaust gas pulsation not detected

2009 Toyota Tundra

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

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

Page 564

© 2006 Mitchell Repair Information Company, LLC.