Okay, so a friend and I just finished swapping an engine in an '03 Z06. We took the engine out from the bottom and had the entire drivetrain out completely. the car sat for roughly 6 months before this weekend when we finally got it running. we went over the wiring several times to make sure nothing got left unplugged and all the grounds were connected. now, i'm getting the below codes and i'm trying to diagnose why i'm getting them. i'm wondering if i have an input voltage wire shorted or grounded somewhere, but i don't know if the input voltage for all these sensors is common.

P0300 - Engine Misfire Detected
P1380 - EBTCM DTC Detected
C1221 - LF Wheel Speed Sensor Input Signal is 0
C1225 - RF Excessive Wheel Speed Variation
C1232 - LF Wheel Speed Circuit Open or Shorted
C1283 - Can't find a description for this one

At one point I was getting P0107 or P0108 (i think 7) but it has since cleared itself and not come back.

We were concerned about the EBCM maybe just having air in it, causing the Active Handling errors, but I've bled it twice and everything seems fine there. The day we got it running, the AH and TC lights on the dash would randomly go off and it would say ABS active and the pedal would get a little stiff like the ABS really had kicked on. It only did that a couple of times, but I never had braking issues.

So my thoughts are since a lot of sensors on the care share a common input voltage source that there's something wrong with that. The problem is I don't have wiring schematics to figure it out. Anyone able to lend a helping hand?

 

Did you plug the wheel speed sensors back in? Make sure they didn't get pinched by the subframe.

And do you hear or feel the misfire that's being detected?

 

Yes, everything is plugged in and we were very cautious when putting the cradle/engine back in to make sure nothing got pinched. There's a possibility that some of the contacts in the connectors aren't making full contact since that may have been the first time they were ever apart. I checked all the grounds last night and they look good.

As far as the misfire goes, it could be isolated from the rest of the codes. We can't hear or feel anything and it popped up immediately during the first start-up just idling. I put a much larger cam in it than it had before and I read that the code will appear sometimes with large cams at idle. I may be able to get that tuned out of it, but the rest still have me baffled at the moment.

 

OK yeah a tune will probably fix that.

The others all appear to be related to the wheel speed sensors. I don't know exactly how they work or how to test them though.

 

For the P0300, look at the ground wire on the rear of the driver's side head and insure its tight otherwise might just be a plug wire not all the way on. Tune is possible as you already discussed.