Tach Signal

[steve]

Just wondering. Would you happen to know which wire is the tach signal on the cas for the 2G?

None of them go from the CAS to the Tach.

The Tach uses the signal from the power transistor module from 91 to 99, Only the '90 cars are different from every other DSM.

Steve

 

[DallasN2O]

Steve, how is the 90 different from the rest concerning the tach signal?

 

[luv2rallye]

The 90 gets it's tach signal from a tacho interface module (special noise filter) which gets it's signal from the coil (internal OR gate).

 

[DallasN2O]

So if I own a 90 and I want to install a shift light.. which wire and where do I tap into?

 

[steve]

So if I own a 90 and I want to install a shift light.. which wire and where do I tap into?

Depends on the what the shift light wants to see as a trigger signal.
You either going to use what goes to ECU pin 109 from the sender on the coil or the CAS signal on ECU pin 21.

Start with 109 and see if the light and your stock tach both work.

 

[Slobonator4G63]

hey pin 109 what color is the wire? i dont want to tap into the wire unless i know it's for sure is the tach wire. Is it the thinner black wire. can someone please give me the go ahead on this so i can get my car running.

 

[steve]

hey pin 109 what color is the wire? i dont want to tap into the wire unless i know it's for sure is the tach wire. Is it the thinner black wire. can someone please give me the go ahead on this so i can get my car running.

http://www.dsmlink.com/images/forums/1GECUPinout.pdf
http://www.dsmtuners.com/forums/fre...tions/344490-download-1g-service-manuals.html
http://www.dsmtuners.com/forums/articles-tuning-ecu/246467-how-identify-ecu-pin-numbers.html