P1440

DTC P1440 SECONDARY AIR INJECTION SYSTEM CONTROL VALVE CIRCUIT BANK 1

CIRCUIT DESCRIPTION

DTC Detection Condition:

The secondary air injection system pumps air to the exhaust port to accelerate the activation of the catalyst.

The secondary air injection system consists of the ECM, air pump, Air Switching Valve (ASV) (EASV), Air Switching Valve No.2 (ASV No.2) (ASV1, 2), pressure sensor and air injection driver (AID). The Air Switching Valve (ASV) (EASV) is an electromagnetic type and Air Switching Valve No.2 (ASV No.2) (ASV1,2) is a vacuum type.

The secondary air injection system pumps pressurized air to the exhaust port by the air pump through the ASV and ASV No.2. The ASV assists the ASV No.2. The ASV No.2 also controls air supply.

The ECM sends signals to the AID, and then the AID operates the air pump and ASV. The pressure sensor detects pressure and exhaust pulsation in the system when the system operates and when it does not operate, and sends the data to the ECM.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Condition:

Typical Malfunction Thresholds:

The ECM detects an open or short in the circuit of the VSV for air injection control according to the AIV1 (AIV2) terminal voltage, stores the DTC, and then illuminates the MIL. When the AIV1 (AIV2) terminal voltage is less than half of the +B voltage while the VSV for air injection control is not operating, the ECM determines it as a malfunction.

Wiring Diagram:

Step 1 - 2:

Step 3:

INSPECTION PROCEDURE