DTC P0412 Secondary Air Injection System Switching Valve "A" Circuit: Description
The Secondary Air Injection (Al) 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.
| DTC No. | DTC Detection Condition | Trouble Area |
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| P0412 | Both of the following conditions are met when engine is idling just after cold start (1 trip detection logic):
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| P0412 | Both of the following conditions are met when engine is idling just after cold start (1 trip detection logic):
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