Toyota Tundra. Manual — part 1424

Fig. 228: Pressure Sensor & ECM Communication Diagram

The ECM monitors the pressure in the secondary air passage using the pressure sensor located on the air
switching valve in the secondary air injection system.

If there is a defect in the sensor or the sensor circuit, the voltage level deviates from the normal operating range,
the ECM interprets this deviation as a malfunction in the pressure sensor or circuit and sets a DTC.

MONITOR STRATEGY

MONITOR STRATEGY

Related DTCs

P2431: Air flow/Pressure sensor circuit rationality
P2432: Air flow/Pressure sensor circuit range check (Low
voltage)
P2433: Air flow/Pressure sensor circuit range check (High
voltage)
P2436: Air flow/Pressure sensor circuit rationality
P2437: Air flow/Pressure sensor circuit range check (Low
voltage)
P2438: Air flow/Pressure sensor circuit range check (High
voltage)

Required Sensors/Components (Main) Pressure sensor
Required Sensors/Components
(Related)

-

Frequency of Operation

Continuous

Duration

P2432, P2433: 0.5 seconds
P2431: 5 seconds

MIL Operation

P2432 and P2433: Immediate
P2431: 2 driving cycles

Sequence of Operation

None

2008 Toyota Tundra

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

TYPICAL ENABLING CONDITIONS

P2432, P2433, P2437 and P2438

TYPICAL ENABLING CONDITIONS - P2432, P2433, P2437 AND P2438

P2431 and P2436:

TYPICAL ENABLING CONDITIONS - P2431 AND P2436

TYPICAL MALFUNCTION THRESHOLDS

P2432 and P2437:

TYPICAL MALFUNCTION THRESHOLDS - P2432 AND P2437

P2433 and P2438:

TYPICAL MALFUNCTION THRESHOLDS - P2433 AND P2438

P2431 and P2436:

TYPICAL MALFUNCTION THRESHOLDS - P2431 AND P2436

COMPONENT OPERATING RANGE

COMPONENT OPERATING RANGE

WIRING DIAGRAM

Refer to DTC P0412 .

Monitor runs whenever following DTCs not present

None

All of following conditions met:

-

Starter

OFF

Battery voltage

8 V or higher

Ignition switch

ON

Monitor runs whenever following DTCs not
present

P2432, P2433, P2437, P2438 (AIR Pressure Sensor -
Low/High)

Starter

OFF

Battery voltage

8 V or higher

Ignition switch

ON

Air pressure sensor voltage

Less than 0.5 V

Air pressure sensor voltage

Higher than 4.5 V

Air pressure

Less than 45.6 kPa (342 mmHg), or more than 135 kPa (1013 mmHg)

Air pressure sensor voltage

Between 0.5 V and 4.5 V

2008 Toyota Tundra

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

INSPECTION PROCEDURE

HINT:

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.

1. CHECK HARNESS AND CONNECTOR (PRESSURE SENSOR - ECM)

a. Disconnect the D58 or D59 pressure sensor connector.

b. Disconnect the A24 and D74 ECM connectors.

c. Measure the resistance according to the value(s) in the table below.

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection

Condition Specified Condition

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

Always

Below 1 ohms

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

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 (VC)

Always

Below 1 ohms

D59-4 (E22) - D74-97 (ETHW)

Always

Below 1 ohms

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

Always

10 kohms or higher

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

Always

10 kohms or higher

2008 Toyota Tundra

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

Fig. 229: Identifying D58, D59 Pressure Sensor & A24, D74 ECM Connectors

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : Go to Next Step

2. INSPECT AIR SWITCHING VALVE (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 to ON and turn the Techstream ON.

2008 Toyota Tundra

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