Speeduino is now on Github Sponsors (Rather than Patreon): https://github.com/sponsors/noisymime
Help with building your Speeduino, installing it, getting it to run etc.
#50213
Hi I just finished connecting my Speeduino 0.4.4c smd board. But trying it I realized 2 things:

-If I connect GND to ground and +12 volts only on the idle valve connected to pin 37, the ECU magically turns on, this also applies to VVT pin 38.

-If I measure the voltage between the correct positive (+12) and the idle or VVT output (pin 37 or 38) I find 10 volts, in fact it happens that if I mount the ECU on my car the idle valve is always open even with the engine turned off.

-When the ECU is switched on normally between the positive (+12) and an injector channel switched off the voltage is 2 volts.

I am not an electronic technician but I want to understand if the ECU is faulty.
Connections are ok.
Has anyone ever noticed this?

Thanks in advance for your reply.
#50225
Andrea Beraldo wrote:
Mon May 10, 2021 9:50 pm
-If I connect GND to ground and +12 volts only on the idle valve connected to pin 37, the ECU magically turns on, this also applies to VVT pin 38.
I suspect that you are back feeding through a recirculation diode. Usually the supplies to the actuators are isolated by the main relay when the ECU is off.
#50276
JHolland wrote:
Tue May 11, 2021 8:30 am
Andrea Beraldo wrote:
Mon May 10, 2021 9:50 pm
-If I connect GND to ground and +12 volts only on the idle valve connected to pin 37, the ECU magically turns on, this also applies to VVT pin 38.
I suspect that you are back feeding through a recirculation diode. Usually the supplies to the actuators are isolated by the main relay when the ECU is off.
Yes, I also think that the problem is, I will put an additional transistor that only controls the relay of the ecu.
Auto Transmission Controller

I think work in this direction is awesome. I di[…]

What is controlling the coil? are you driving it d[…]

IAT and A0 with trimpot

Got it, thanks

Setting crank trigger up

Your phone is not so good, or the blurring is from[…]

Still can't find what you're looking for?