Toyota Tundra. Manual — part 1431
Condition 4:
TYPICAL MALFUNCTION THRESHOLDS - CONDITION 4
Condition 5:
TYPICAL MALFUNCTION THRESHOLDS - CONDITION 5
Condition 6:
TYPICAL MALFUNCTION THRESHOLDS - CONDITION 6
Condition 7:
TYPICAL MALFUNCTION THRESHOLDS - CONDITION 7
Condition 8:
TYPICAL MALFUNCTION THRESHOLDS - CONDITION 8
Case 1:
TYPICAL MALFUNCTION THRESHOLDS - CASE 1
Case 2:
TYPICAL MALFUNCTION THRESHOLDS - CASE 2
Case 3:
TYPICAL MALFUNCTION THRESHOLDS - CASE 3
AIR pressure during AIR ON
1 kPa or more and pulse is not generated
AIR pressure during AIR ON
Less than 1 kPa and pulse is not generated
AIR pressure during AIR OFF
5 kPa or more and pulse is generated
AIR pressure during AIR OFF
Less than 5 kPa and pulse is generated
AIR pressure during AIR OFF
5 kPa or more and pulse is not generated
AIR pressure during AIR OFF
Less than 5 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
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra
Case 4:
TYPICAL MALFUNCTION THRESHOLDS - CASE 4
MONITOR RESULT
Refer to CHECKING MONITOR STATUS .
WIRING DIAGRAM
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 sets 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:
AIR amount
108 L/min or less
AIR pressure change
5 kPa or more
Air Pump
ON
Air Switching Valve
Open
Pressure
1 kPa or more
Pulsation Detection
Exhaust gas pulsation detected
Air Pump
OFF
Air Switching Valve
Open
Pressure
Less than 1 kPa
Pulsation Detection
Exhaust gas pulsation detected
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra
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
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
Air Pump
ON
Air Switching Valve
Closed
Pressure
1 kPa or more
Pulsation Detection
Exhaust gas pulsation not detected
Air Pump
OFF
Air Switching Valve
Close
Pressure
Less than 1 kPa
Pulsation Detection
Exhaust gas pulsation not detected
Air Pump
ON
Air Switching Valve
Open
Pressure
5 kPa or more
Pulsation Detection
Exhaust gas pulsation detected
Air Pump
OFF
Air Switching Valve
Open
Pressure
Less than 5 kPa
Pulsation Detection
Exhaust gas pulsation detected
Air Pump
ON
Air Switching Valve
Closed
Pressure
5 kPa or more
Pulsation Detection
Exhaust gas pulsation not detected
Air Pump
OFF
Air Switching Valve
Close
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra
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 1 kPa indicated in the table
above is a threshold for detecting pump malfunctions.
DTC CHART
HINT:
If the vacuum hose between the ASV and the pressure sensor is not connected correctly, case 4 may
Pressure
Less than 5 kPa
Pulsation Detection
Exhaust gas pulsation not detected
Detected Conditions while
AIR operating: Air pump
ON, ASV Open
Detected Conditions while
AIR not operating: Air pump
OFF, ASV Closed
ECM Determination
DTCs Output
Case 1
Case 8
Normal
-
Case 1
Case 6
ASV stuck open
P2440 or P2442
Case 1
Case 7
Air pump stuck ON
P2444 or P2446
Case 2
Case 8
Air pump stuck OFF
P2445 or P2447
Case 3
Case 8
ASV stuck closed
P2441 or P2443
Case 1
Case 5
ASV stuck open and air
pump stuck ON
P2440 and
P2444 or P2442
and P2446
Case 2
Case 6
ASV stuck open and air
pump stuck OFF
P2440 and
P2445 or P2442
and P2447
Case 3
Case 7
ASV stuck closed and
air pump stuck ON
P2441 and
P2444 or P2443
and P2446
Case 4
Case 8
ASV stuck closed and
air pump stuck OFF
P2441 and
P2445 or P2443
and P2447
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra
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