Toyota Tundra. Manual — part 1247

TESTER CONNECTION SPECIFIED CONDITION

Standard resistance (Check for short)

TESTER CONNECTION SPECIFIED CONDITION

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Tester Connection

Condition Specified Condition

D58-3 (AIP) - A24-54 (AIP)

Always

Below 1 ohms

D58-2 (VC) - D74-66 (VCV2)

Always

Below 1 ohms

D58-4 (E2) - D74-98 (ETHA)

Always

Below 1 ohms

D59-3 (AIP2) - A24-53 (AIP2)

Always

Below 1 ohms

D59-2 (VC2) - D74-66 (VCV2) Always

Below 1 ohms

D59-4 (E22) - D74-98 (ETHA) Always

Below 1 ohms

Tester Connection

Condition Specified Condition

D58-3 (AIP) or A24-54 (AIP) - Body ground

Always

10 kohms or higher

D58-2 (VC) or D74-66 (VCV2) - Body ground

Always

10 kohms or higher

D59-3 (AIP2) or A24-53 (AIP2) - Body ground

Always

10 kohms or higher

D59-2 (VC2) or D74-66 (VCV2) - Body ground Always

10 kohms or higher

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

Fig. 213: Identifying D58, D59 Pressure Sensor Connector & A24, D74 ECM Connector Terminals

OK : Go to next step.

2. INSPECT AIR SWITCHING VALVE ASSEMBLY (PRESSURE SENSOR)

a. Connect a pressure gauge to the air pressure sensor as shown in the illustration.

b. Connect the Techstream to the DLC3.

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

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

Air pump 2 pressure (absolute).

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

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 ASSEMBLY . (See AIR SWITCHING VALVE ).

Fig. 214: Connecting Pressure Gauge To Air Pressure Sensor

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 TROUBLE DETECTION CONDITION CHART

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

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 sets a DTC:

DTC

No.

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)



Air switching valve
(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 (1GR-FE) - Tundra