Toyota Tundra. Manual — part 1246

Fig. 210: Secondary Air Injection (Air) System - System Diagram

DTC TROUBLE DETECTION CONDITION CHART

MONITOR DESCRIPTION

DTC

No.

DTC Detection Condition

Trouble Area

P2431
P2436

Pressure sensor indicates less than 45.6 kPa (342 mmHg), or
more than 135 kPa (1013 mmHg) (2 trip detection logic)



Pressure sensor



Open or short in
pressure sensor circuit



ECM

P2432
P2437

While engine running, voltage output of pressure sensor remains
below 0.5 V (1 trip detection logic)



Pressure sensor



Open or short in
pressure sensor circuit



ECM

P2433
P2438

While engine running, voltage output of pressure sensor remains
above 4.5 V (1 trip detection logic)



Pressure sensor



Open or short in
pressure sensor circuit



ECM

2008 Toyota Tundra

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

Fig. 211: Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank
1 - Circuit 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

TYPICAL ENABLING CONDITIONS

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, P2437, P2438: 0.5 seconds
P2431, P2436: 5 seconds

MIL Operation

P2432, P2433, P2437, P2438: Immediate
P2431, P2436: 2 driving cycles

Sequence of Operation

None

2008 Toyota Tundra

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

P2432, P2433, P2437 and P2438

TYPICAL ENABLING CONDITIONS

P2431 and P2436:

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

P2432 and P2437:

TYPICAL MALFUNCTION THRESHOLDS

P2433 and P2438:

TYPICAL MALFUNCTION THRESHOLDS

P2431 and P2436:

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

COMPONENT OPERATING RANGE

WIRING DIAGRAM

Monitor runs whenever following DTCs not present

None

All of following conditions met:

-

Starter

OFF

Battery voltage

8 V or more

Ignition switch

ON

Monitor runs whenever following DTCs not present

None

Starter

OFF

Battery voltage

8 V or more

Ignition switch

ON

Air pressure sensor voltage

Less than 0.5 V

Air pressure sensor voltage

More than 4.5 V

Air pressure

Less than 45.6 kPa (342 mmHg), or more than 135 kPa (1,013 mmHg)

Air pressure sensor voltage

Between 0.1 V and 4.8 V

2008 Toyota Tundra

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

Fig. 212: Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank
1 - Wiring Diagram

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 or D74 ECM connector.

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

Standard resistance (Check for open)

2008 Toyota Tundra

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