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New Edge Cobras
Speedometer bouncing and car bucking
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<blockquote data-quote="mwolson" data-source="post: 16605750" data-attributes="member: 16006"><p>You are on the right track. In 99+ cars, the PCM reads the OSS, calculates the speed and sends it to the instrument cluster in digital form via the data bus. Here's a video I made that shows you how to test an OSS. You just need a piece of steel and an AC voltmeter: [MEDIA=youtube]8KhlG52_9k0[/MEDIA]</p><p></p><p>Reading the speed from the PCM with a scanner can also prove that the OSS is working and that the PCM is able to read it.</p><p></p><p>When you power up the cluster, all of the gauges should do a full sweep. That full sweep doubles as both a self test and it ensures that the needle starts at 0 RPMs when it first powers up. It does that when I first apply power to a cluster on the bench. I can't remember if you have to remove all power to the cluster or if just turning the key off and then on again will trigger that self test.</p><p></p><p>Hope this helps.</p></blockquote><p></p>
[QUOTE="mwolson, post: 16605750, member: 16006"] You are on the right track. In 99+ cars, the PCM reads the OSS, calculates the speed and sends it to the instrument cluster in digital form via the data bus. Here's a video I made that shows you how to test an OSS. You just need a piece of steel and an AC voltmeter: [MEDIA=youtube]8KhlG52_9k0[/MEDIA] Reading the speed from the PCM with a scanner can also prove that the OSS is working and that the PCM is able to read it. When you power up the cluster, all of the gauges should do a full sweep. That full sweep doubles as both a self test and it ensures that the needle starts at 0 RPMs when it first powers up. It does that when I first apply power to a cluster on the bench. I can't remember if you have to remove all power to the cluster or if just turning the key off and then on again will trigger that self test. Hope this helps. [/QUOTE]
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