Changed out pcm to no avail!
The stock ecm throws the DTC 1656 too so this eliminates the ecm as the problem. Also reminds me why I have a performance program in the other ecm, stock bites it.
So, now I checked the voltage at the solenoid and its variable with throttle movement, think GM calls for 8.0 volts w/key on at idle.
Checked resistance in solenoid and it is @ 40.0 ohms don't know what a good one should show, if any of you know please advise.
GM data on DTC 1656 points to a short, or open circuit as the culprit thinking of just making a new stand alone harness to this circuit and hope this fixes the problem.
As always I wish to thank all of who are assisting my effort to repair this circuit!
Ok, you have my attention
Quote:
Originally Posted by
JohnC
Old programmer's adage: "Never trap an error you can't handle..."
Are you running the stock PCM? What are you measuring to determine pulsing? The rate should be constant; the dwell is what varies.
Using BH's program and I don't think I have the ability to measure the pulse and dwell unless my multi-meter can do it. My carcode gives me the % real time.