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4runner v8 what is dis code p0412 and how do i fix it.with pix pls.

Posted / edited by AnonymousUser on : 22-11-2021

Answers :

Code PO412 secondary air injection system switching valve A circuit malfunction.
I'm going to post the description from engine-codes.com since it is a big paragraph. You will need a shop manual or else take it to a repair shop that has the equipment and book to check it out.

P0412 TOYOTA Description
\012\011\011\011An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module (PCM) grounds the Air pump relay control circuit which energizes the Air pump. The PCM\012 also grounds the Air combination valve vacuum control solenoid circuit,\012 which energizes the Air vacuum control solenoid. Vacuum is then applied\012 to both Air combination valve diaphragms which opens the shut off \012valves. The PCM \012enables both circuits simultaneously when Air system operations id \012desired. When the AIR system is active, then Air pump forces fresh air \012into the exhaust stream in order to accelerate catalyst operation. The \012AIR combination valves replace the conventional check valves. When the \012AIR system is inactive the shut off valves prevent air flow in either \012direction.\011\011
The DTC P0412 is detected the the AIR vacuum control solenoid circuit not operating as desired by the PCM.
Read more: http://engine-codes.com/p0412_toyota.html#ixzz2Y7OQTCbb
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