HomeDoes anyone know what signal input the cluster gets to operate the tacho? Is it either 5,8 or 12v?
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Tacho input
5 posters
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4 Re: Tacho input 2nd June 2015, 9:00 am
johnboy
Don't know if this helps. Seems to say between 1 and 5 volts but as it will be pulses that doesn't mean a lot. My guess would be 5v peak??
5 Re: Tacho input 2nd June 2015, 11:24 am
gtir_woody
moderator
Thanks mate, that's helpful. I'll do a little searching and post what I figure out 
6 Re: Tacho input 2nd June 2015, 11:32 am
joetheeskimo
Probably PWM signal isnt it, or a variable frequency square wave.
7 Re: Tacho input 2nd June 2015, 11:38 am
gtir_woody
moderator
I thought I read somewhere the cluster changes the signal type and then sends it to the ecu, can't confirm that though.
8 Re: Tacho input 2nd June 2015, 12:31 pm
johnny gtir
moderator
That rings a bell somewhere in my grey matter woody
9 Re: Tacho input 2nd June 2015, 9:39 pm
gtir_woody
moderator
Yeah Im almost positive I've seen it somewhere johnny. Correction in the above though, the tacho gets a signal from the ECU, and the ECU gets the signal from the CAS.
10 Re: Tacho input 2nd July 2015, 7:55 am
gtir_woody
moderator
Found out its 5v, duty cycle 20% and 4 pulses per cycle by looking up the haltech plug and play map.
Also the speedo is 1225 pulses/ km for the ecu.
Also the speedo is 1225 pulses/ km for the ecu.
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