Air Injection System
During vehicle cold start, the Air Injection System (AIS) delivers a controlled amount of outside air into the exhaust system, upstream of the catalytic converters, in order to help reduce hydrocarbon and carbon monoxide gas emissions.
The Air Injection System consists of the flowing components:
- Air Injection Pump
- Air Injection Pump Relay
- Air Injection (Nylon) Tube
- Exhaust one-way check valve
- Inlet Air Injection Filter
- Inlet Air Injection Hose
- MAF Sensor
When the Air Injection Pump is activated, air is drawn into the Air Injection System through the Inlet Air Injection Filter. The air is then passed through the MAF Sensor, which monitors the amount of air that enters the Air Injection System. The PCM uses the MAF Sensor information to control Air Pump operation based on feedback from the front O2 sensor. After passing through the MAF Sensor, air travels through the Inlet Air Injection hose, into the Air Pump (where it is compressed), through the Air Injection (Nylon) Tube, past the Exhaust one-way check valve, and into the exhaust system.