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New Edge Cobras
Speedometer bouncing and car bucking
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<blockquote data-quote="shurur" data-source="post: 16605793" data-attributes="member: 113850"><p>Thanks.</p><p>The tach reads fine.</p><p>So since both tach and speedo use the OSS via the data+ signal (tan/org), I am leaning toward the speedo failing.</p><p>The speedo was intermittent; now speedo is dead.</p><p>[If the speedo is dead, then the idea that checking the pcm speed to the actual speedo to see whether the OSS sensor is bad is not a valid approach..and the pcm is looking at the actual speedo info coming from the cluster ecu as a feedback loop somehow..write-read-verify...I wonder whether data+ and data- are differential, simplex or full duplex (digital)..full duplex makes more sense, but the signal names seem to be differential]</p><p></p><p>When I get the cluster plugged back in..then get the battery hooked up, I will watch for the sweep and then run cluster diagnostics.</p><p></p><p>After I am quite sure it is the cluster, I may take it apart and check for cold solders before shipping it for repair.</p><p></p><p>In 2015, I soldered the cold soldered ribbon cables in the cluster and got the odometer running....I can't remember the speedo not working at that time...but it may not have worked. This may be the same problem all over again..dunno.</p></blockquote><p></p>
[QUOTE="shurur, post: 16605793, member: 113850"] Thanks. The tach reads fine. So since both tach and speedo use the OSS via the data+ signal (tan/org), I am leaning toward the speedo failing. The speedo was intermittent; now speedo is dead. [If the speedo is dead, then the idea that checking the pcm speed to the actual speedo to see whether the OSS sensor is bad is not a valid approach..and the pcm is looking at the actual speedo info coming from the cluster ecu as a feedback loop somehow..write-read-verify...I wonder whether data+ and data- are differential, simplex or full duplex (digital)..full duplex makes more sense, but the signal names seem to be differential] When I get the cluster plugged back in..then get the battery hooked up, I will watch for the sweep and then run cluster diagnostics. After I am quite sure it is the cluster, I may take it apart and check for cold solders before shipping it for repair. In 2015, I soldered the cold soldered ribbon cables in the cluster and got the odometer running....I can't remember the speedo not working at that time...but it may not have worked. This may be the same problem all over again..dunno. [/QUOTE]
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Speedometer bouncing and car bucking
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