Toyota Tundra. Manual — part 1425

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

and Air Pump2 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.

Result

RESULT REFERENCE

HINT:

The Techstream displays the air pump pressure as absolute pressure.

Fig. 230: Connecting Pressure Gauge To Air Pressure Sensor

B : REPLACE AIR SWITCHING VALVE . (See AIR SWITCHING VALVE (FOR BANK 1) ).

C : REPLACE AIR SWITCHING VALVE . (See AIR SWITCHING VALVE (FOR BANK 2) ).

Result

Proceed To

OK

A

NG (for Bank 1)

B

NG (for Bank 2)

C

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

A : 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

HINT:

Air switching valve normal operation:

DTC

Code

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

P2441
P2443

Pressure sensor detects no pulsation of exhaust gas despite ECM
commanding Air Switching Valve (ASV) to open, while engine
running (2 trip detection logic)



ASV



Open or short in
ASV circuit



Vacuum hose (ASV
- pressure sensor)



Air injection hose



Pressure sensor



Pressure sensor
circuit



Air Injection
Control Driver
(AID)



ECM

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

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 sets 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

All:

TYPICAL ENABLING CONDITIONS - ALL

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

Monitor runs whenever following DTCs not present

P0010 - P0022: VVT System
P0031 - P0052: Front A/F Sensor Heater
P0102 - P0103: MAF sensor
P0110 - P0113: IAT sensor
P0115 - P0118: ECT sensor
P0120 - P2125: TP sensor
P0125: Insufficient ECT for Closed Loop
P0171 - P0175: Fuel trim
P0300 - P0308: Misfire
P0325 - P0333: Knock sensor

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

Case 1:

TYPICAL ENABLING CONDITIONS - CASE 1

Case 2:

TYPICAL ENABLING CONDITIONS - CASE 2

Case 3:

TYPICAL ENABLING CONDITIONS - CASE 3

TYPICAL MALFUNCTION THRESHOLDS

Condition 1:

TYPICAL MALFUNCTION THRESHOLDS - CONDITION 1

Condition 2:

P0335: CKP sensor
P0340 - P0346: VVT sensor
P0351 - P0358: Igniter
P0441 - P2420: EVAP system
P0500: VSS
P1340: CMP sensor
P2195 - P2A03: A/F sensor
P2430 - P2433: AIR Pressure Sensor (Low/High)

Battery voltage

11 V or higher

Atmospheric pressure

45 kPa (337.5 mmHg) or more

Time after secondary injection operation begins

5 seconds or more

Secondary air injection pump

ON

Secondary air injection switching valve

ON

Delay time after engine started

5 seconds or more

Pressure sensor malfunction

Not detected

Secondary air injection pump

OFF

Secondary air injection system monitor during secondary air injection ON

Completed

Pressure sensor malfunction

Not detected

Cumulative intake air amount

150g/sec. or more

AIR pump

OFF

AIR valve

OFF

AIR status

OFF

Pressure sensor malfunction

Not detected

AIR pressure during AIR ON

1 kPa or more and pulse is generated

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra