Toyota Tundra (2015 year). Manual — part 1664
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
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:
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 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.
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.
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 / 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.
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:
h.
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2444-P244...
OPERATION
AIR PUMP
ASV
PRESSURE*1
PULSATION*2
AIR PUMP: ON, ASV: OPEN
ON
OPEN
2.4 kPa or more
10 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.
Turn the ignition switch off.
NOTICE:
This Secondary Air Injection Check only allows technicians to operate the AIR system
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.
Performing the Secondary Air Injection Check repeatedly may cause damage to the
has 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.
i.
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 and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(d) Read DTCs.
Result
RESULT
PROCEED TO
P2444, P2445, P2446 and/or P2447 are 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
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2444-P244...
A
A
first.
B
GO TO AIR PUMP INSPECTION PROCEDURE
C
GO TO DTC CHART
2.
CHECK FREEZE FRAME DATA (AIR PUMP FREEZE AND AIR SWITCHING VALVE
FREEZE)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream on.
Result
RESULT
PROCEED
TO
AIR PUMP
FREEZE
AIR PUMP2
FREEZE
AIR SWITCHING VALVE
FREEZE
AIR SWITCHING VALVE2
FREEZE
OFF
OFF
CLOSE
CLOSE
B
Except above
A
B
GO TO STEP 8
3.
PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE AIR PUMP
HEATER)
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2444-P244...
OK
OK
(a) Disconnect the air pump connector.
(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/ Active Test / Activate the Air Pump
Heater.
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
D89-1 (APH+) - Body ground
Activate the Air Pump Heater is ON
11 to 14 V
D90-1 (APH+) - Body ground
Activate the Air Pump Heater is ON
11 to 14 V
NG
GO TO STEP 5
4.
INSPECT AIR PUMP (HEATER RESISTANCE)
(a) Inspect the air pump (for bank 1 or bank 2)
.
NG
REPLACE AIR PUMP (FOR BANK 1 OR BANK 2)
5.
INSPECT AIR PUMP HEATER RELAY (AI HTR)
(a) Inspect the air pump heater relay (AI HTR)
.
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2444-P244...
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