Hi list I checked the frequency valve by connecting negative on the voltmeter to the engine, and positive to the +12v on the frequency valve, and there is 12v present. now can i connect the positive to the battery + and negative to the other connection on the frequency valve to check the ecu connection? thanks Chris vin 16327 ----- Original Message ----- From: chris <chris@xxxx> To: <dmcnews@xxxxxxxxxxx> Sent: Monday, November 13, 2000 5:11 PM Subject: [DML] Frequency valve > Hi list/DMC joe > > I was reading a manual published by Bosch, which covered K jetronic, > which said the frequency valve recieves a constant 12v feed and the > ECU pulses the ground. If i connect a voltmeter across the terminals, > i should get a pulsing 12v? correct?. If there is 12v across the > valve, if i connect 12v direct i should be able to feel/hear the > valve clicking?. When the valve has no power i assume it is shut, > which mean if its not working the engine will run rich? Could this > cause the cat to glow red? > > If there is not 12v at the valve I should check 12v at the lamda > relay which runs to the frequency valve? and continuity of both 12v > and negative from the ECU to the valve? > > If the Lambda sensor is not working or disconnected i assume the > valve just work as it should when could on a fixed ratio? This should > eliminate the sensor if its causing a problem? > > Thanks > > Chris Vin 16327 > > > > Before posting messages or replies, see the posting policy rules at: > www.dmcnews.com/Admin/rules.html > > To address comments privately to the moderating team, please address: > moderator@xxxx > >