Toyota Tundra (2015 year). Manual — part 2029
Pressure
Less than 2.4 kPa
Pulsation Detection
Exhaust gas pulsation detected
Pressure Condition in Secondary Air Injection System Case 3:
Air Pump
ON
Air Switching Valve
Closed
Pressure
2.4 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
Close
Pressure
Less than 2.4 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
2.4 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 2.4 kPa
Pulsation Detection
Exhaust gas pulsation detected
Pressure Condition in Secondary Air Injection System Case 7:
Air Pump
ON
Air Switching Valve
Closed
Pressure
2.4 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
Close
Pressure
Less than 2.4 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
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2440-P2443;...
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:
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
HINT:
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2440-P2443;...
If the vacuum hose between the ASV and the pressure sensor is not connected correctly, case 4 may
occur.
By using the Techstream to perform the 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 / 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 and turn the Techstream on.
d.
Enter the following menus: Powertrain / Engine and ECT / Utility / 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.
e.
Start the engine.
f.
Perform the AIR system intrusive operation while the engine is idling.
g.
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:
OPERATION
AIR PUMP
ASV
PRESSURE*1
PULSATION*2
AIR PUMP: ON, ASV: OPEN
ON
OPEN
2.4 kPa or more
20 kPa or more
AIR PUMP: OFF, ASV: CLOSE
OFF
CLOSE
Less than 2.4 kPa
Less than 30 kPa
*1:
Average pumping pressure (gauge pressure). The pressure should be 2.4 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.
h.
Turn the ignition switch to OFF.
NOTICE:
This Air Injection Check only allows technicians to operate the AIR system for a
display indicates the prohibition (WAIT or ERROR).
If an ERROR is displayed on the Techstream during the test, stop the engine for
10 minutes, and then try again.
i.
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2440-P2443;...
A
Performing the Air Injection Check repeatedly may cause damage to the AIR system.
reconnected, wait for 7 minutes with the ignition switch turned to ON or the engine
running.
Turn the ignition switch off when the Air Injection Check operation finishes.
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.
PROCEDURE
1.
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO SECONDARY AIR
INJECTION SYSTEM DTCS)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(d) Read DTCs.
Result
RESULT
PROCEED TO
P2440, P2441, P2442 and/or P2443 are output
A
P2440, P2441, P2442 and/or P2443 and P0412 and/or P0415 are output
B
P2440, P2441, P2442 and/or P2443 and other DTCs (except P0412 and P0415) are output
C
If any DTCs other than P0412, P0415, P2440, P2441, P2442 and/or P2443 are output, troubleshoot those DTCs
first.
B
GO TO AIR SWITCHING VALVE INSPECTION
PROCEDURE (P0412 AND P0415)
C
GO TO DTC CHART
2.
PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE AIR PUMP
HEATER)
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2440-P2443;...
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