So, once again, this car has been driven this way for 13,000 miles states the proud owner. 13,000 miles with 3580 rpm and that's it. Finally, after having him at my shop with other customers, I told him, I'm fixing your car...period.

Well, I might have opened a bag of worms.

Now, indirectly, this car was worked on by the same crew of the Hondata/burned injector driver/b20vtec supercharged coupe I had talked about in this forum.

So, first of all the engine light was disabled (bulb). I reenabled it to at least know what the ecu was tellin me. It was indicating 4 or CKP. Looking at the harness, the dizzy is hardwired in.

After exposing wires, I go through the helms flowchart, check resistance between sensor inputs....all good. Then check continuity to ground from each sensor input and get continuity. If continuity exists, helms advises to replace the dizzy housing.

Replaced the dizzy housing with a known good unit, still get continuity. Helms obviously doesn't account for a modified stock harness. The stock harness was from a Y7, moded to fit an OBD1 LS. So the alt plug was changed, IAC, dizzy, and IAT.

So, when the ecu is connected, the CKP sensor gets continuity to ground through the pin B16 location. As a result, it throws a CKP code and goes into limp. I also tried multiple ecu's to eliminate them as the issue.

Asking the customer the facts, the fact was the motor clearly ran fine in the Teg it came out of. The car the swap is in was entirely stock prior, and they modified the Y7 harness to fit the LS. So, all I can suspect is somehow this is occuring due to an error made somewhere else in the harness. The alt plug makes me suspicious.

My plan is to remove the entire harness thursday and check/repair/improve the wiring job that was done prior.

What I'm looking for is any educated suggestions of what might be happening here.

I fix alot of these wiring issues locally, but I honestly hate them because in the rare event you don't completely fix the issue, it makes it harder to charge outright. Thanks!

 

Switch to another known working dizzy...if you checked everything else, this is the only thing you can do.

 

I did that man....the CKP gets continuity to ground regardless of housing. Switching the dizzy was an obvious fix, and I tried it early...didn't work man.

 

my money is on that they accidentally swapped b15 and b16. I think you will still get continuity if they flipped the wires, but that would mean the ckp sensor was grounding out on the sensor output side, and appearing dead to the ecu on the input side.

If it is an easy task, i.e. jumper harness, you might swap the wires and see what happens. If its all hardwired, you should just run a couple wires to the sensor and the ecu to verify your sanity

good luck

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sanimalp &raquo;</TD></TR><TR><TD CLASS="quote">my money is on that they accidentally swapped b15 and b16. I think you will still get continuity if they flipped the wires, but that would mean the ckp sensor was grounding out on the sensor output side, and appearing dead to the ecu on the input side.

If it is an easy task, i.e. jumper harness, you might swap the wires and see what happens. If its all hardwired, you should just run a couple wires to the sensor and the ecu to verify your sanity

good luck</TD></TR></TABLE>

+1

unplug ECU B connector and dizzy plug. check continuity from end to end. check CKP wire pair too, prolly a short ckt or flipped ^^.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RC000E &raquo;</TD></TR><TR><TD CLASS="quote">My plan is to remove the entire harness thursday and check/repair/improve the wiring job that was done prior. </TD></TR></TABLE>

 

First thing I did after pulling the code was verify the dizzy wiring and run continuity to the ecu plugs (Guess I didnt detail everything in my post). The wiring is correct, like I said, there is a continuity to ground that shouldn't be there.

Fact is though, at this point the customer pulled everything out of the car without much more to say. He has a sohc swap and a new harness...so end of the game.