Hello,
This morning i have tried measuring all connectors with DVM again.
with V3 powered;
PS2 Female connector(V3)
Pin#3(GND) VS Pin#5(PS2-CLK) got 0Volt.
Pin##3(GND) VS Pin#4(+5Vsupply) got 5Volts.
I guess the V3 send out the +5Volts power then it shouldn't have something on V3board!!??
Next,I have tried to measure the signal from pin50/55 the.the signal was send in pulse signal between 0V and 11V whilst the
car is moving...
https://www.youtube.com/watch?v=IsqY2lB84c0Then,with V3 powered;i connected the PS2 connectors together and measured with DVM.
DSUB9/7(GND) VS DSUB9/9(PS2-clk;aka singnal-in) got 0.8-0.9Volt(same as fphil's post above)
DSUB9/7(GND) VS DSUB9/8(+5V supply) got 5Volts as it should.
Again,i disconnected the PS2 connectors and connected the signal from pin50 motronic to DSUB9/9 and GND to DSUB9/7.
i used the DVM to measure the PS2 male connector(Cable).
Pin#3 vs Pin#5 got
0 volt**.**on the red 0 volt reading Does this mean the cable fails to send the signal(0-5V) to V3?that's why i got wheelspeed won't be working?
and something surprised when i assembled everything when i opened the vemstune i found wheelspeed reading 0-5
whilst the car is stationary.maybe something needs more investigation then.