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Pressure Condition in Secondary Air Injection System Case 3 Air Pump ON Air Switching Valve Closed Pressure 1.9 kPa or more Pulsation Detection Exhaust gas pulsation not detected Pressure Condition in Secondary Air Injection System Case 4 Air Pump OFF Air Switching Valve Closed Pressure Less than 3.0 kPa Pulsation Detection Exhaust gas pulsation not detected Pressure Condition in Secondary Air Injection System Case 5 Air Pump ON Air Switching Valve Open Pressure 1.9 kPa or more Pulsation Detection Exhaust gas pulsation detected Pressure Condition in Secondary Air Injection System Case 6 Air Pump OFF Air Switching Valve Open Pressure Less than 3.0 kPa Pulsation Detection Exhaust gas pulsation detected Pressure Condition in Secondary Air Injection System Case 7 Air Pump ON Air Switching Valve Closed Pressure 1.9 kPa or more Pulsation Detection Exhaust gas pulsation not detected Pressure Condition in Secondary Air Injection System Case 8 Air Pump OFF Air Switching Valve Closed Pressure Less than 3.0 kPa Pulsation Detection Exhaust gas pulsation not detected If the detected pressure is high, the air pump is assumed to be ON and if it alternates sharply, the ASV is |