Toyota Tundra (2015 year). Manual — part 1280
try again.
1.
Turn the ignition switch off.
2.
Connect the Techstream to the DLC3.
3.
Turn the ignition switch to ON.
4.
Turn the Techstream on.
5.
Clear DTCs (if set)
.
6.
Turn the ignition switch off and wait for at least 30 seconds.
7.
Turn the ignition switch to ON and turn the Techstream on.
8.
Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check /
Automatic Mode.
9.
Start the engine after the Techstream initialization is finished.
10.
Perform the System Check operation by pressing ENTER (Next).
11.
Perform the following to confirm the AIR system pending codes: Press ENTER (Exit).
12.
Check for pending DTCs.
OK:
No pending DTC is output.
13.
After the "Secondary air injection check" is completed, check for All Readiness by entering the
following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14.
Input the DTC: P2440, P2441, P2442 or P2443.
15.
Check the DTC judgment result.
TESTER
DISPLAY
DESCRIPTION
NORMAL
DTC judgment completed
System normal
ABNORMAL
DTC judgment completed
System abnormal
INCOMPLETE
DTC judgment not completed
Perform driving pattern after confirming DTC enabling conditions
N/A
Unable to perform DTC judgment
HINT:
If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
16.
If the test result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and
check for permanent DTCs
.
HINT:
17.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2440-P2443;...
If no permanent DTC is output, the system is normal.
If a permanent DTC is output, the system is malfunctioning.
Turn the ignition switch off.
18.
WIRING DIAGRAM
Refer to DTC P0412
.
INSPECTION PROCEDURE
HINT:
Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from the transmission.
Bank 2 refers to the bank that does not include the No. 1 cylinder.
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 a cold
engine start, 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
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 2
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 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
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2440-P2443;...
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
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:
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
Case 1
Case 8
Normal
-
Case 1
Case 6
Air switching valve 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
Air switching valve stuck closed
P2441
or
P2443
Case 1
Case 5
Air switching valve stuck open and
air pump stuck ON
P2440 and
P2444
or
P2442 and
P2446
Case 2
Case 6
Air switching valve stuck open and
air pump stuck OFF
P2440 and
P2445
or
P2442 and
P2447
Case 3
Case 7
Air switching valve stuck closed
and air pump stuck ON
P2441 and
P2444
or
P2443 and
P2446
Case 4
Case 8
Air switching valve stuck closed
and air pump stuck OFF
P2441 and
P2445
or
P2443 and
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:
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2440-P2443;...
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