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Pierburg vacuum valve in PAIR system 900 1997

posted by  larry139 on  Fri Jul 30 07:13 CST 2004
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Many thanks to earlier responders to my PAIR questions

However, my problem is with the PAIR system, not evap system. Valve in question is on driver side and below cannister Purge valve. It has small plastic hose connection that runs over top front of engine to the air injection pump solenoid valve located on passenger side, with hose (approx. 1" diameter) to air injection pump. My Volvo parts buddy tells me this is the EGR (exhaust gas recirculating) valve. There is a small vacuum hose with a small check valve that connects to this "EGR" valve. Valve apparently is normally closed and is apparently actuated by signal voltage from ECU (?). When valve is bypassed by connecting inlet hose to outlet hose (to the air pump solenoid valve), the air pump runs OK. Question: Is it OK to connect 12 volts to valve connection as someone suggested? Voltage on input connector varies from about 200 MV to 700 MV with high sensitivity digital meter (Beckman).
I assume the exhaust O2 sensor signals the ECU when secondary air injection is needed. Maybe a 1.5 V test signal should be used. Any suggestions and/or comments greatly appreciated. Larry
--
L R Hicks






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