Toyota Tundra. Manual — part 1616

Fig. 246: Inspecting Air Switching Valve (Pressure Sensor)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Connect the Techstream to the DLC3.

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

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c. Turn the ignition switch to ON and turn the Techstream ON.

d. Enter the following menus: Powertrain/Engine and ECT/Data List/Air pump pressure (absolute)

and Air Pump 2 Pressure (Absolute).

e. Check that the pressure displayed on the Techstream fluctuates when applying the pressure to the

pressure sensor with the pressure gauge.

OK:

Pressure fluctuates in response to pressure applied with pressure gauge.

HINT:

The Techstream displays the air pump pressure as absolute pressure.

NG: REPLACE AIR SWITCHING VALVE (See REMOVAL )

OK: REPLACE ECM (See REMOVAL )

DTC P2440 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE STUCK OPEN BANK 1;
DTC P2441 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE STUCK CLOSE BANK
1; DTC P2442 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE STUCK OPEN BANK
2; DTC P2443 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE STUCK CLOSED
BANK 2

DESCRIPTION

Refer to DTC P0412 .

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

NOTE:

Do not let foreign matter enter the sensor when applying pressure.

DTC

DTC Detection Condition

Trouble Area

P2440
P2442

Pressure sensor detects pulsation
of exhaust gas despite ECM
commanding Air Switching Valve
(ASV) to close, while engine
running (1 trip detection logic)



ASV



Open or short in ASV circuit



Pressure sensor



Pressure sensor circuit



Air Injection Control Driver
(AID)



ECM

Pressure sensor detects no
pulsation of exhaust gas despite



ASV



Open or short in ASV circuit



Vacuum hose (ASV -
pressure sensor)

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

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© 2006 Mitchell Repair Information Company, LLC.

HINT:

Air switching valve normal operation:

When the Air Switching Valve (ASV) is open, exhaust gas pulsation occurs in the secondary air passage.

When the ASV is closed, exhaust gas pulsation does not occur in the secondary air passage.

MONITOR DESCRIPTION

The ECM monitors the pressure in the secondary air passage using the pressure sensor connected to the ASV of
the Secondary Air Injection (AIR) system.

If either of the following conditions occurs, the ECM interprets it as a malfunction of the AIR system, and
illuminates the MIL and stores a DTC:



Exhaust gas pulsation is detected by the pressure sensor despite the ECM commanding the ASV to close.



Exhaust gas pulsation is not detected by the pressure sensor despite the ECM commanding the ASV to
open.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

P2441
P2443

ECM commanding Air Switching
Valve (ASV) to open, while
engine running (2 trip detection
logic)



Air injection hose



Pressure sensor



Pressure sensor circuit



Air Injection Control Driver
(AID)



ECM

Related DTCs

P2440: Air control valve stuck open
P2441: Air control valve stuck closed
P2442: Air control valve stuck open
P2443: Air control valve stuck closed

Required Sensors/Components (Main)

Pressure sensor

Required Sensors/Components (Related)

-

Frequency of Operation

Once per drive cycle

Duration

2 seconds: Case 3
7 seconds: Case 1, 2

MIL Operation

1 driving cycle: Case 3
2 driving cycles: Case 1, 2

Sequence of Operation

None

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2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

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All:

TYPICAL ENABLING CONDITIONS - ALL

Case 1:

TYPICAL ENABLING CONDITIONS - CASE 1

Case 2:

TYPICAL ENABLING CONDITIONS - CASE 2

Monitor runs whenever
following DTCs not present

P0010, P0020 (VVT Oil Control Valve)
P0011, P0021 (VVT System - Advance)
P0012, P0022 (VVT System - Retard)
P0016, P0018 (VVT System - Misalignment)
P0013, P0023 (Exhaust VVT Oil Control Valve)
P0014, P0024 (Exhaust VVT System - Advance)
P0015, P0025 (Exhaust VVT System - Retard)
P0017, P0019 (Exhaust VVT System - Misalignment)
P0031, P0032, P0051, P0052 (Air Fuel Ratio Sensor Heater)
P2195, P2196, P2197, P2198, P2237, P2238, P2239, P2240, P2241,
P2242, P2252, P2253, P2255, P2256, P2A00, P2A03 (Air Fuel Ratio
Sensor)
P0102, P0103 (Mass Air Flow Sensor)
P0112, P0113 (Intake Air Temperature Sensor)
P0115, P0117, P0118 (Engine Coolant Temperature Sensor)
P0125 (Insufficient Coolant Temperature for Closed Loop Fuel Control)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle
Position Sensor)
P0171, P0172, P0174, P0175 (Fuel System)
P0301 - P0308 (Misfire)
P0327, P0328, P0332, P0333, P032C, P032D, P033C, P033D (Knock
Sensor)
P0335 (Crankshaft Position Sensor) P1340 (Camshaft Position Sensor)
P0340, P0342, P0343, P0345, P0347, P0348 (VVT Sensor)
P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT Sensor)
P0351 - P0358 (Igniter)
P0451, P0452, P0453 (EVAP System)
P0500, P0722 (Vehicle Speed Sensor)
P2431, P2432, P2433, P2436, P2437, P2438 (Secondary Air Injection
System Pressure Sensor)

Battery voltage

11 V or more

Atmospheric pressure

45 kPa (337.5 mmHg) or more

Secondary air injection pump

ON

Secondary air injection switching valve

ON

Engine speed

Less than 3750 RPM

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Saturday, June 19, 2010 7:34:45 PM

Page 560

© 2006 Mitchell Repair Information Company, LLC.