MSefi.com read only forum (Jan.15,2018)

I'm having trouble with what should be a basic connection of a simple 2003 GM solenoid for fast idle and could use some help. First thing is do I set the tacho output to IAC1 or just leave it off ? Second is the valve only supposed to work with the engine running or when the key is on based on temperature setting. I have the solenoid powered by an ignition on wire and grounded to FIDLE with the IDLE Control set on/off valve. I also checked the pins next to the relay on my relay board and the middle is connected to G. I turned the ignition on and the valve doesn't open but it I can hear the relay buzzing a bit. In the test mode the gauge on the right idle PMW only goes to 20% which I thought since this is only an on/off it should read 100%.
Here is the valve I'm using a simple GM on off


Could someone please tell me what I'm doing wrong.

jzsquared wrote:I'm having trouble with what should be a basic connection of a simple 2003 GM solenoid for fast idle and could use some help. First thing is do I set the tacho output to IAC1 or just leave it off ?

Tach output is unrelated to this solenoid. If this is a 2 wire solenoid, you will not need the stepper circuit.

Second is the valve only supposed to work with the engine running or when the key is on based on temperature setting. I have the solenoid powered by an ignition on wire and grounded to FIDLE with the IDLE Control set on/off valve. I also checked the pins next to the relay on my relay board and the middle is connected to G. I turned the ignition on and the valve doesn't open but it I can hear the relay buzzing a bit. In the test mode the gauge on the right idle PMW only goes to 20% which I thought since this is only an on/off it should read 100%.
Here is the valve I'm using a simple GM on off


Could someone please tell me what I'm doing wrong.

I believe it should power it with the key on and engine off if below the operating temperature. Can you post a data log of an attempted start and a copy of your MSQ?

I had the thermostat setting at 200 so it should have turned on. I again heard a short buzzing but the valve didn't open

Figured it out, I went into advanced , output port setting and just set coolant to below 160 . Woo hoo I have a simple fast idle just what I needed