P2431

DTC P2431 SECONDARY AIR INJECTION SYSTEM AIR FLOW/PRESSURE SENSOR CIRCUIT RANGE/PERFORMANCE BANK 1

CIRCUIT DESCRIPTION

DTC Detecting Condition:

To accelerate the activation of catalyst when warming up the engine, the air injection system pumps the secondary air to the exhaust manifold. The secondary air is supplied by the air pump and it is pumped to the exhaust manifold through the air switching valve. Open and close movement of the air switching valve is regulated by the vacuum switching valve (VSV).The air pump and the air switching valve are observed by the ECM and are used to detect malfunction in this system.

The ECM monitors the secondary air injection system and detects malfunction using a pressure sensor located on the air switching valve.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

Component Operating Range:

The ECM observes 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 will deviate from the normal operating range, the ECM interprets this deviation as a defect in the pressure sensor circuit and sets a DTC.

Wiring Diagram:

Step 1 - 2:

INSPECTION PROCEDURE

HINT: To check the pressure condition in the secondary air passage, the hand-held tester is available.

a. Connect the hand-held tester to the DLC3 on the vehicle.
b. Turn the ignition switch ON and push the hand-held tester main switch ON.
c. Start the engine.
d. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/SECOND AIR VSV/ALL or USER DATA" (press the right or left button).

NOTE: When selecting USER DATA, select "SECONDARY AIR" and "SECOND AIR VSV" on the screen by pressing the "YES" button on the tester.

HINT: When operating the VSV in the secondary air system, the air pump is also operated at the same time.

e. Check that the SECONDARY AIR, SECOND AIR VSV and 2ND AIR PRESS on the hand-held tester indicate the same conditions as the chart.






NOTE: This test allows the technician to operate the VSV for only 5 seconds. If you perform the test again, more than 30 seconds interval must be required after the previous test is done.

HINT:
*1: Means the signal output from the ECM to operate the air pump.
*2: Means the signal output from the ECM to operate the VSV.
*3: Means the difference between the air pressure inside the air pressure sensor and the atmospheric pressure. When the pressure inside the secondary air injection system is equal to the atmospheric pressure, the hand-held tester displays "0 kPa".