IACV 0% = 100%

[Wolf_Tm]

Hi,
I'd need an info about how VEMS drive the IACV:
is there any reason why with IACV PWM DC at 0% the valve is COMPLETELY opened (like 100%) and the minimum I can use to close it is 1%?
How could I completely close the IACV then?

Thanks

[Kamuto]

Hi,
I'd need an info about how VEMS drive the IACV:
is there any reason why with IACV PWM DC at 0% the valve is COMPLETELY opened (like 100%) and the minimum I can use to close it is 1%?
How could I completely close the IACV then?

Thanks

are you sure you are connected it right way? + is there a diode on it?

[Wolf_Tm]

Hi,
I'd need an info about how VEMS drive the IACV:
is there any reason why with IACV PWM DC at 0% the valve is COMPLETELY opened (like 100%) and the minimum I can use to close it is 1%?
How could I completely close the IACV then?

Thanks

are you sure you are connected it right way? + is there a diode on it?

Hi Kamuto,
I'm pretty sure I connected in the right way... it's a 3 wire IAC (positive. gnd, ecu controlled gnd).
I didn't put the diode because it worked almost ok, unless for the fact that it works correctly from 100% down to 1% IAC DC... but as I select/get to 0%, it totally opens up as it was a 100%:
do you think the diode would solve it?

[Kamuto]

Hi,
I'd need an info about how VEMS drive the IACV:
is there any reason why with IACV PWM DC at 0% the valve is COMPLETELY opened (like 100%) and the minimum I can use to close it is 1%?
How could I completely close the IACV then?

Thanks

are you sure you are connected it right way? + is there a diode on it?

Hi Kamuto,
I'm pretty sure I connected in the right way... it's a 3 wire IAC (positive. gnd, ecu controlled gnd).
I didn't put the diode because it worked almost ok, unless for the fact that it works correctly from 100% down to 1% IAC DC... but as I select/get to 0%, it totally opens up as it was a 100%:
do you think the diode would solve it?

first of all, you will never reach 0% in reality.. no diode there wont help :) it's more your iac valve problem, not ecu :)  just limit it at idle hardware settings, like 10% min and 90% max :)

[Wolf_Tm]

Hi,
I'd need an info about how VEMS drive the IACV:
is there any reason why with IACV PWM DC at 0% the valve is COMPLETELY opened (like 100%) and the minimum I can use to close it is 1%?
How could I completely close the IACV then?

Thanks

are you sure you are connected it right way? + is there a diode on it?

Hi Kamuto,
I'm pretty sure I connected in the right way... it's a 3 wire IAC (positive. gnd, ecu controlled gnd).
I didn't put the diode because it worked almost ok, unless for the fact that it works correctly from 100% down to 1% IAC DC... but as I select/get to 0%, it totally opens up as it was a 100%:
do you think the diode would solve it?

first of all, you will never reach 0% in reality.. no diode there wont help :) it's more your iac valve problem, not ecu :)  just limit it at idle hardware settings, like 10% min and 90% max :)

Yes, you're right, in fact I later opened up the valve and discovered that the factory setting was not totally closed at 0%:
I turned the solenoid a bit in its buttonholes and now it's fine!