Toyota Tundra (2015 year). Manual — part 2031
damage to the AIR system. If necessary, leave an interval of
several minutes between System Check operations to
prevent the system from overheating.
When performing the Air Injection Check operation after the
battery cable 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 Air Injection Check
operation finishes.
Standard:
AIR PUMP
OPERATIONS
ASV
OPERATIONS
EXHAUST GAS
PULSATION
ON
OFF
Not detected
ON
ON
Detected
(b) Other inspection method:
The ASV operation can be confirmed by checking the cumulative
pressure pulsation* provided in the System Check.
Perform System Check operation under Manual Mode.
*: 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.
(1) Start the engine and warm it up.
(2) Turn the ignition switch off.
(3) Connect the Techstream to the DLC3.
(4) Turn the ignition switch to ON and turn the
Techstream on.
(5) 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.
(6) Start the engine after the Techstream initialization is
finished.
(7) Perform the AIR system intrusive operation while the
engine is idling.
(8) Check that the air-fuel ratio and pressure in the
secondary air injection system passage (PULSATION)
displayed on the Techstream indicate the conditions
shown in the table below.
(9) Turn the ignition switch off.
OK:
AIR SYSTEM
OPERATION
PULSATION
CONDITION
(ECM
CALCULATION)
AIR-FUEL RATIO
(REFERENCE)
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2440-P2443;...
A
AIR SYSTEM
OPERATION
PULSATION
CONDITION
(ECM
CALCULATION)
AIR-FUEL RATIO
(REFERENCE)
AIR PUMP: ON,
ASV: OPEN
20 kPa or more
18 or more
AIR PUMP: OFF,
ASV: CLOSE
Less than 30 kPa
Approximately 14.5
(around stoichiometric
air-fuel ratio)
Reference:
If the air pump operation is confirmed as normal
, the air-fuel
the air pump operates.
Result
RESULT
PROCEED TO
NG
A
OK
B
B
GO TO STEP 16
9.
INSPECT AIR TUBE (BLOCKAGES AND LEAKAGES)
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2440-P2443;...
OK
OK
(a) Check that the No. 2 and No. 3 air tubes are securely
connected to both the exhaust manifold and the ASV.
(b) Inspect the air tube for blockages and damage.
OK:
No blockages and damage on intake pipe.
NG
REPLACE AIR TUBE
10.
INSPECT AIR SWITCHING VALVE
(a) Inspect the air switching valve
.
NG
REPLACE AIR SWITCHING VALVE ASSEMBLY
11.
INSPECT AIR INJECTION CONTROL DRIVER (POWER SOURCE OF AIR INJECTION
CONTROL DRIVER)
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2440-P2443;...
OK
(a) Disconnect the D48 and D50 or D52 and D54 AID
connectors.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the
table below.
Standard voltage:
TESTER CONNECTION
SWITCH
CONDITION
SPECIFIED CONDITION
D48-1 (BATT) - Body
ground
Always
11 to 14 V (near battery
voltage)
D50-5 (+B) - Body
ground
Ignition switch
ON
11 to 14 V (near battery
voltage)
D52-1 (BAT2) - Body
ground
Always
11 to 14 V (near battery
voltage)
D54-5 (+B2) - Body
ground
Ignition switch
ON
11 to 14 V (near battery
voltage)
(d) Measure the resistance according to the value(s) in the
table below.
Standard resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
D50-1 (E) - Body ground
Always
Below 1 Ω
D54-1 (E2) - Body ground
Always
Below 1 Ω
NG
REPAIR OR REPLACE AIR INJECTION CONTROL
DRIVER POWER SOURCE CIRCUIT
12.
CHECK HARNESS AND CONNECTOR (ECM - AIR INJECTION CONTROL DRIVER)
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2440-P2443;...
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