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secondaryair.jpg | Hits: 1177 | Posted on: 12/3/07
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Secondary Air Injection system consists of a belt-driven Air Pump, single or dual AIR Diverter valve(s), an AIR Bypass valve, and AIR Bypass solenoids, air silencer/filter, Powertrain Control Module and connecting wires and vacuum hoses. The Belt-Driven Secondary Air Injection system provides either upstream/bypass air or upstream/downstream/bypass air. The number of these system configurations vary significantly with AIR Bypass and AIR Diverter valve combinations (Figure 179).
1. The PCM requires ECT, IAT and rpm inputs to initiate Secondary Air Injection operation.
2. The PCM provides one or more signals that enable one or more AIR Bypass solenoids.
3. The AIR Bypass solenoids control one or more AIR Bypass valves and/or AIR Bypass Diverter Valves in order to route secondary air depending upon the specific configuration.
4. The belt-driven Air Pump is operational any time the engine is running.
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