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1990 740 Turbo - Interesting Speedo Issue - bad rear sensor? 700 1990

posted by  nautical34 on  Thu Aug 25 07:18 CST 2016
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last visit: Wed Dec 29 09:48 CST 2010
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Hello - it's been a while since I've posted anything, but I'm having an issue with my 1990 Volvo 740 Turbo. The speedometer registers about 1/3 of the speed that I'm going so the max I ever see it register is around 25mph (aka 70mph) on the highway. It's very consistent, but consistently 1/3 of the speed.

What I've tried:
- cleaned the rear pins at the differential plug
- made sure the connection at the rear plug is solid
- removed instrument cluster and re-soldered anything that looked iffy

Based on what I've read my next purchase/course of action is to replace the sensor at the rear differential.

Note: ABS light is on.

Any other thoughts or ideas about this would be greatly appreciated. Rear sensors are a bit pricey.






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New 1990 740 Turbo - Interesting Speedo Issue - bad rear sensor? [700][1990]
posted by  nautical34  on Thu Aug 25 07:18 CST 2016 >


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