1994 Saturn SC1 Speedometer

Tiny
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The connector should be unplugged from the fuse box when testing it.
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Monday, October 4th, 2010 AT 2:37 PM
Tiny
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Ok so I finally got it unplugged and tested the ohms between terminal A on the dash cluster and terminal C from the cluster on the fuse box. It's pretty steady from.2 ohms to.5 ohms
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Monday, October 4th, 2010 AT 3:14 PM
Tiny
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https://www.2carpros.com/forum/automotive_pictures/416332_1994_SC1_speedo_test_1.jpg


It's beginning to look like you have a bad speedometer.Try what i posted and emailed you by checking that A terminal at about 60 mph for voltage it should read half of battery voltage.You don't have the cruise cluster tester so you will have to improvise by spinning the tire's at about 60 mph with the tire's safely off the ground.They are selling one of those cruise cluster tester's on ebay though.
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Tuesday, October 5th, 2010 AT 5:06 PM
Tiny
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I havnt had a chance to test that yet however I believe the speedometer itself is working. Earlier in the week a friend of mine said to try running my own wire from the dark green and white one that goes to the passenger restraint system strait to the speedometer. When I tried that the speedometer went up to thirty but that's it. I'll still let u know how the whole going sixty on jacks thing turns out though
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Wednesday, October 6th, 2010 AT 4:29 PM
Tiny
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I havnt had a chance to test that yet however I believe the speedometer itself is working. Earlier in the week a friend of mine said to try running my own wire from the dark green and white one that goes to the passenger restraint system strait to the speedometer. When I tried that the speedometer went up to thirty but that's it. I'll still let u know how the whole going sixty on jacks thing turns out though[/quote:1093e185e0]
I measured the voltage while the wheels where spinning at what I think would be around 60. It said to be about 7
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Wednesday, October 6th, 2010 AT 5:11 PM
Tiny
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It's looking like the speedometer the trouble tree say's half of battery voltage and 7 volt's is about half when the car is at 60 mph. But you said it got to only 30 mph when you jumped it from the seat belt relay. Try jump it from the ecm to speedometer instead of it going thru the fuse box that way you will know your problem is from the ecm to or thru the fuse box.
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Thursday, October 7th, 2010 AT 3:38 PM
Tiny
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I couldn't find anything about an ECM on my car so I assumed u ment PCM and used the wire going from that to the fuse box to jump strait to the speedometer. After that I drove the car and again the speedometer went up to thirty and stopped. However I noticed that if I drove it past thirty mph and slowed down the needle seemed to stay at thirty until it the speed went down to thirty and then the needle moved down with the cars speed.
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Friday, October 8th, 2010 AT 3:05 PM
Tiny
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You have a ecm a pcm mean's you have a automatic transmission and the computer for the engine and transmission are combined. It's looking like a bad speedometer if it stop's going up at 30 mph what if you smack the dash will it go up higher then 30 mph?
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Friday, October 8th, 2010 AT 3:22 PM
Tiny
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I took the car out for a drive with my whole instrument cluster unbolted. I tried shaking it, hitting it, turning it over etc. The speedometer stayed at thirty. However I did notice that as soon as I turned the car on the temp was 3/4 the way up and moved back and forth whenever I put the right blinker on
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Friday, October 8th, 2010 AT 3:51 PM
Tiny
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It's getting stranger by the min but it's looking like a bad speedometer since your getting a good speed input and it only goes to 30 mph.
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Friday, October 8th, 2010 AT 5:31 PM
Tiny
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That's if I jump it though. What about when it's not jumped and it does nothing? Or can I just leave it jumped and put an inline fuse to protect it if I get a new speedometer and it works?
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Friday, October 8th, 2010 AT 11:55 PM
Tiny
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Since you checked and got a good connection from the fuse box to the speedometer then you must have a problem from the computer to the fuse box or where the computer wire connects to the the speedometer wire at the fuse box.
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Saturday, October 9th, 2010 AT 11:54 PM

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