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P0418 Diagnostic Trouble Code Discussion for August 2014

Secondary AIR System Pump Relay Control Circuit Malfunction (Bank 1)

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Trouble Ticket Help Requests for DTC P0418
Help Request Posted
2005 Lexus GX470 4.7L MIL Lamp on VIN: JTJBT20X55
P0418: secondary air injection system relay A circuit. i added 12 volts straight to pump and pump works as designed opened pump filter is intact. tested the valve with presure sensor and it hold presure as well as opens when activated. i tested the valves in rear of engine also tested both vacume switching valves....
August 21, 2014