i have a 98 expedition 4.6 4x4 check engine light on od light flashing sometimes checked it and got p1747 code i was told epc solenoid or short on trans wiring. i already dropped the trans pan can somebody tell me a step by step easy way to diagnose and find the short or if i need to replace any of the solenoids i have voltmeter and taste light

 

I cant give you a step by step on finding a short or a wiring issue but I do find bad PCM's in these when I get that code, just something else to check.

 

how do you check if pcm is bad

 

Any solution on this issue? I am having the same problem. The EPC solenoid has been replaced, along with the wiring harness and the throttle position sensor to no avail.