P1443
DTC P1440 Secondary Air Injection Vacuum Switching Valve Circuit Malfunction Bank 1DTC P1443 Secondary Air Injection Vacuum Switching Valve Circuit Malfunction Bank 2
DESCRIPTION
DTC Detection Condition:
The Secondary Air Injection (AI) 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), No. 2 Air Switching Valve (No. 2 ASV) (ASV1, 2), pressure sensor and Air Injection Control Driver (AID). The Air Switching Valve (ASV) (EASV) is an electromagnetic type and No. 2 Air Switching Valve (No. 2 ASV)(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 No. 2 ASV. The ASV assists the No. 2 ASV. The No. 2 ASV 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 Conditions:
Typical Malfunction Thresholds (Part 1):
Typical Malfunction Thresholds (Part 2):
The ECM detects an open or short in the circuit of the VSV for air injection system 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 system is not operating, the ECM determines it as a malfunction.
Wiring Diagram:
Step 1-3:
Step 3(Continued):
INSPECTION PROCEDURE
HINT: Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.