RWD - speedometer inop

Volvo RWD 900 Forum

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speedometer inop 900 1993

I agree with Randy's advice as a start.

I don't agree with the advice to hang a long wire on the plug, shorting it repeatedly, to simulate a signal. Though I can picture a situation where this may have actually worked (high electrical noise environment under fluorescent lamps perhaps) the signal both the Yazaki and VDO clusters are looking for is generated voltage, not switch closure. If it does work for you, that's OK to focus suspicion on the sender, but if it doesn't cause indication on the speedometer, don't assume that vindicates the sender.

A better test is substituting a signal, or just confirming the resistance of the sender can be seen from the cluster looking back, but I suspect most issues will be obvious and look like this example from a 240:

Art Benstein near Baltimore

"...people will always choose a simple lie over a complicated truth, because the lie has one unbeatable advantage: the truth always has to stick to what actually happened, whereas the lie just has to be easy to believe" - Fredrik Backman


New speedometer inop [900][1993]
posted by  Dom's940  on Sat Apr 13 16:28 CST 2019 >

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