Ford Bronco Secondary Air Injection System Diagram - Thermactor Parts & Numbers

This document is an exploded/schematic parts diagram of a Ford Secondary Air Injection (Thermactor) system, identified by figure number A20801-A. The illustration shows the routing of air injection plumbing from the secondary air injection pump through the bypass and diverter valves, upstream and downstream check valves, and into the exhaust manifolds and three-way catalytic converters. Ten numbered callouts on the diagram correspond to two legend tables listing each component's item number, Ford base part number, and description. Components identified include the Downstream Secondary Air Injection Check Valve (9A487), Secondary Air Injection Diverter Valve (9F491), Vacuum Control Connector (part of 9F491), Secondary Air Injection Bypass Valve (9B289), Vacuum Control Connector (part of 9B289), Secondary Air Injection Pump (9A486), Silencer Ports (part of 9B289), Upstream Secondary Air Injection Check Valve (9A487), Exhaust Manifold (9430), and Three-Way Catalytic Converter (5E212). A reader can use this document to identify the location, connection order, and Ford base part numbers of the secondary air injection (smog pump) system components, useful when diagnosing emissions faults or ordering replacement parts. The document itself does not state a year, model, or engine applicability.