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No proper RPM signal

4K views 2 replies 1 participant last post by  R3cK 
#1 ·
Hey guys,

swapped a S13 SR20DET redtop in my ca18det RS13.

problem is: i dont get a correct rpm - jumping around when starting, 0 when running

- i put in a resistor -> works in my buddys car, but not in mine
- other gauge -> no
- other ECU -> no

so what could cause this mistery?

CAS wires are: + - 0° 180°
signal into ECU
ECU into dash (yellow/red)


:confused::confused:
 
#2 ·
im out of ideas.
i unplugged the dash and took new wires + / - and signal from ecu
still acting as box of ****. needle is zero or bouncing a bit an goes back to zero then.

also checked the CAS (engine running fine anyways) and got perfect ground/12V/ and signals between 0.1 and 5v as mentioned in the service book.

no fuqin idea whats wrong with my tach signal.
also tested another ECU/cluster -> same problem

nice diagram: http://blog.dariuszokon.com/wp-content/uploads/2013/12/finals13sr20wireshemati.png
but still no idea
 
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