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Old 06-08-17, 12:07 PM   #1
Junior Member
Join Date: Aug 2017
Posts: 1
Default tachometer has 3 gears!

Here's what may be a bit of a brain teaser.

The tachometer on my 2007 Peugeot 207 1.6 HDi Sport has an occasional but increasingly frequent problem in that while driving it suddenly starts displaying rpms that are either precisely half of what they should be, or zero.
It remains like this until restarting the engine, which always clears it.

Initially it was a very rare occurrence – maybe once or twice a year, but it has gradually increased to once or twice a week.
If it was a simple intermittent electrical contact problem I would expect it to be much more random and not necessarily be always solved by restarting.

I guess a candidate would be the engine speed sensor, although I don’t know where it is on the engine – it does not appear in the Haynes circuit diagrams or text.
However, I feel that the output from this sensor must feed into the engine management unit at some point, but there is no noticeable effect on the engine.

The 50% rpm effect is particularly intriguing, unless the rpm sensor is actually a pair of sensors with separate contacts.

Any ideas gratefully received.

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