Toyota Tundra (2015 year). Manual — part 1287
Pressure Condition in Secondary Air Injection System Case 3
Air Pump
ON
Air Switching Valve
Closed
Pressure
1.9 kPa or more
Pulsation Detection
Exhaust gas pulsation not detected
Pressure Condition in Secondary Air Injection System Case 4
Air Pump
OFF
Air Switching Valve
Closed
Pressure
Less than 3.0 kPa
Pulsation Detection
Exhaust gas pulsation not detected
Pressure Condition in Secondary Air Injection System Case 5
Air Pump
ON
Air Switching Valve
Open
Pressure
1.9 kPa or more
Pulsation Detection
Exhaust gas pulsation detected
Pressure Condition in Secondary Air Injection System Case 6
Air Pump
OFF
Air Switching Valve
Open
Pressure
Less than 3.0 kPa
Pulsation Detection
Exhaust gas pulsation detected
Pressure Condition in Secondary Air Injection System Case 7
Air Pump
ON
Air Switching Valve
Closed
Pressure
1.9 kPa or more
Pulsation Detection
Exhaust gas pulsation not detected
Pressure Condition in Secondary Air Injection System Case 8
Air Pump
OFF
Air Switching Valve
Closed
Pressure
Less than 3.0 kPa
Pulsation Detection
Exhaust gas pulsation not detected
If the detected pressure is high, the air pump is assumed to be ON and if it alternates sharply, the ASV is
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:
AIR OPERATING:
AIR PUMP ON, ASV OPEN
DETECTED CONDITION WHILE
AIR NOT OPERATING:
AIR PUMP OFF, ASV CLOSED
ECM DETERMINATION
DTC 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
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2444-P2447;...
DETECTED CONDITION WHILE
AIR OPERATING:
AIR PUMP ON, ASV OPEN
DETECTED CONDITION WHILE
AIR NOT OPERATING:
AIR PUMP OFF, ASV CLOSED
ECM DETERMINATION
DTC OUTPUT
P2447
HINT:
By using the Techstream to perform the Secondary Air Injection Check operation in the System Check, the
air-fuel ratio and the pressure in the secondary air injection system passage can be checked while the
secondary air injection system is operating. This helps technicians to troubleshoot the system when it
malfunctions. Furthermore, pending codes also can be checked by performing Utility / Secondary Air
Injection Check / Automatic Mode after the repair.
Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other
data from the time the malfunction occurred.
System Check:
The pressure in the secondary air passage can be checked using the Techstream.
Start the engine and warm it up.
a.
Turn the ignition switch off.
b.
Connect the Techstream to the DLC3.
c.
Turn the ignition switch to ON.
d.
Turn the Techstream on.
e.
Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection
Check / Manual Mode / AIR PUMP 1: ON, ASV1: OPEN, AIR PUMP 2: ON, ASV2: OPEN and AIR
PUMP 1: OFF, ASV1 CLOSE, AIR PUMP 2: OFF, ASV2 CLOSE.
HINT:
When Manual Mode is selected, the Techstream initialization (atmospheric pressure
measurement) is performed automatically. The initialization takes 10 seconds. After the
initialization, AIR PUMP and ASV operation can be selected.
f.
Start the engine.
g.
Perform the AIR system forced operation while the engine is idling.
h.
Check that the air pump (AIR PUMP), ASV and pressure in the AIR system passage (PRESSURE)
displayed on the Techstream indicate the conditions shown in the table below.
Standard:
TESTER OPERATION
AIR PUMP
ASV
PRESSURE*1
PULSATION*2
AIR PUMP: ON, ASV: OPEN
ON
OPEN
1.9 kPa or more
18 kPa or more
AIR PUMP: OFF, ASV: CLOSE
OFF
CLOSE
Less than 3.0 kPa
Less than 25 kPa
*1: Average pumping pressure (gauge pressure). The pressure should be 1.9 kPa or more
when the AIR system operates.
*2: The cumulative exhaust pulsation calculated by the ECM. If the calculated value
exceeds a certain level, the ECM determines that the exhaust pulsation is in the AIR
system.
i.
Turn the ignition switch off.
NOTICE:
This Secondary Air Injection Check only allows technicians to operate the AIR system for
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2444-P2447;...
A
Furthermore, the check can only be performed up to 4 times per trip. If the test is
display indicates the prohibition (WAIT or ERROR).
If ERROR is displayed on the Techstream during the test, stop the engine for 10
minutes, and then try again.
Performing the Secondary Air Injection Check repeatedly may cause damage to the AIR
been reconnected, wait for 7 minutes with the ignition switch turned to ON or the engine
running.
Turn the ignition switch off when the Secondary Air Injection Check operation finishes.
PROCEDURE
1.
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2444, P2445, P2446
AND/OR P2447)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(e) Read DTCs.
Result
RESULT
PROCEED TO
P2444, P2445, P2446 and/or P2447 is output
A
P2444, P2445, P2446 and/or P2447 and P0418 and/or P0419 are output
B
P2444, P2445, P2446 and/or P2447 and other DTCs (except P0418 and P0419) are output
C
If any DTCs other than P0418, P0419, P2444, P2445, P2446 and/or P2447 are output, troubleshoot those DTCs
first.
B
GO TO AIR PUMP INSPECTION PROCEDURE
C
GO TO DTC CHART
2.
PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE AIR PUMP HEATER)
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2444-P2447;...
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