Parked my SX in garage before xmas. Went to get it out 6 days latter and encountered a no start situation. Checked dtc that were showing up P-688 and P-685. (asd cicuit low and asd relay) .....checked all grounds and no issues there. bypassed asd relay pin 30 and 68a in PDC and car starts. Short of replacing cam and crank sensors anyone with ideas as to why it wont start normally?

 

Replacing the ASD relay still results in a no-start?

 

Yes tried the horn relay in place of the asd relay still no start. Car starts when I jumper the the switched terminals of the asd relay.

 

P0688 says to diagnose P0685 first, so...





Here's the pinout for the ASD, for the B+ Circuit:



If the testing for this checks out, the other code lists the PCM as a possible cause too.

 

some possible corrosion causing extra resitance???

 

Thats what I am leaning towards will know more this weekend when I can pull the connectors off of computer and look at them.....very mild here at the time the problem showed up ...temp went from -15 to +9 in only a few hours ...damn Ontario weather.

 

I found green crust all in the backside of my PDC, (im in ontario canada too)
good idea to flip it over and check for corrosion there