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About 4 wires heated O2 sensor?
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<blockquote data-quote="turbology" data-source="post: 301708" data-attributes="member: 10223"><p>From the E36 Bentley manual (i know yours is E34, but it might be similar <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> ):</p><p>1. Connect the DIGITAL voltmeter to connect 1 and connector 2 on O2 sensor, start the engine, the output of voltage will fluctuating a<strong> short </strong>period of time. (0.2-0.8VDC)</p><p></p><p>2. If incorrect: Seperate sensor harness connect from sensor. Check for battery voltage between terminals 3 & 4 (green wire & brown wire) while engine is running. If voltage is not present, check your oxygen sensor heater relay.</p><p></p><p>3. Check heater element resistance between terminal 3 & 4 of SENSOR. If the sensor's element has no continuity, replace sensor. If the preheater circuit is ok but the sensor doesn't product a fluctuating voltage, replace sensor. </p><p></p><p>In the manual:<strong> To check sensor respone to lean and rich condition</strong>, create an air leak, or pull vacuum hose off the fuel pressure regulator to increase fuel pressure.</p><p>You shall see the output voltage fluctuate.</p><p></p><p>Tightening torque : Oxygen sensor to exhaust pipe - 41 ft-lb <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="turbology, post: 301708, member: 10223"] From the E36 Bentley manual (i know yours is E34, but it might be similar :) ): 1. Connect the DIGITAL voltmeter to connect 1 and connector 2 on O2 sensor, start the engine, the output of voltage will fluctuating a[B] short [/B]period of time. (0.2-0.8VDC) 2. If incorrect: Seperate sensor harness connect from sensor. Check for battery voltage between terminals 3 & 4 (green wire & brown wire) while engine is running. If voltage is not present, check your oxygen sensor heater relay. 3. Check heater element resistance between terminal 3 & 4 of SENSOR. If the sensor's element has no continuity, replace sensor. If the preheater circuit is ok but the sensor doesn't product a fluctuating voltage, replace sensor. In the manual:[B] To check sensor respone to lean and rich condition[/B], create an air leak, or pull vacuum hose off the fuel pressure regulator to increase fuel pressure. You shall see the output voltage fluctuate. Tightening torque : Oxygen sensor to exhaust pipe - 41 ft-lb :) [/QUOTE]
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About 4 wires heated O2 sensor?
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