Just A Guy
Join Date: Mar 2007
Location: New Jersey
My Ride: 1990 Daytona Shelby
Engine: 2.2 L VNT
Thanked 1 Time in 1 Post
Re: ASD will not actuate
No, the crank signal is only present during cranking and running.
It is not needed for the initial one second actuation.
That is why the question is asked...
"Does the fuel pump cycle for one second with initial key on".
If the answer is YES then the ASD circuit is fine, the controller saw "key on" and actuated the ASD relay to pressurize the fuel rail.
The assumption then if this is a no start condition is that the crank or fuel sync signal is missing during cranking so the controller will not actuate the ASD relay again because it does not see the signal.
If the answer is NO which is what you stated then there is an issue in the ASD relay circuit since you turned the key to the "on" position and the fuel pump did not cycle for one second which means the controller does not know you turned the key on or it did see the key turned on and is not able to actuate the ASD relay.
I would think that the latter would set a Code 42 since the controller attempted to actuate and did not see the ASD voltage sense.
Do not confuse this with the Code 42 that you set in memory by manually actuating the ASD relay.
Again, your issue is one of three things since you were able to manually actuate the ASD relay.
1)Loss of switched ignition voltage to controller
2)Open DB/YL wire between diagnostic connector and controller
1990 Daytona Shelby VNT
40 Years ASE Certified (Retired)