r34 gtt tachometer drive signal electric problem

[Thegame1594]

hi i need to know where the tachometer drive signal comes from

i think there is problem with my ecu but dont know exactly.

I have 0 volts at pin 5 of the ecu where it should be apox 7.2 Volts

 

i have added some useful info from the workshop manual. Maybe someone could help me to trace back the problem and where the signal source comes from.

With a bluetooth consult device i can read RPM but the RPM gauge doesnt work anymore. Plus HICAS ABS TCS and SLIP lights and the mentioned parts all in fail safe function i think it is all related but cant proof it.

[GTSBoy]

How are you measuring the voltage?  DMM?  If so, then don't.  You need an analog multimeter or a scope of some sort.  DMMs can't see that sort of PWM signal.  They're too slow.

[Thegame1594]

yes i used a dmm but there must be some voltage there  was no voltage at all. But i think thats not the problem anymore there must be something other wrong

[GTSBoy]

I just told you that the DMM won't see that signal.