Hey guys,
Long time since I have logged in, hope I am in correct area

Park Deuce Tuesday after work no indication of any faults.
Wednesday am she wouldn't start.

Cranks OK, battery a bit week so I put in a spare and have it on trickle charge.

Fuel pump runs, check engine light on but shows hard fault.

replaced coil quickly as I had a spare, still no spark.

So I check codes today, Hard fault Flash code 41
Crank sensor Intermittent or sync error

Checked for resistance at ckp connector and at ECU
5 to 7 ohms

Checked for AC voltage at connector and ecu
around 3 acv

Manual says replace sensor if that don't fix it replace ecu,
hmmmm

the strange part is, when cranking with ckp sensor unplugged, no fuel pump, with it plugged in there is pump operation.
you would think it would be fine.

really don't want to through parts at her, hoping some expert has some other tips for me to check first.

 

Bas or bank angle sensor, is the only other one I can think of. I Don't know how to ck it , but I know they can be problematic. Make sure to check all wires and grounds as well.

 

Thanx for chiming in Blob,
much appreciated.
Ya, I was thinking about the BAS, but from reading I think that would also cut the Fuel pump and Cranking would it not?

Crank sensor is going to run me about $100, even though it seems to check out properly, the manual says to replace this before the ECU

I am afraid to find out how much an ECU will run, and can't find the procedure on how to replace it.

(relearn password? does it need programmed?, these are the things I need to find out)

 

I'm betting it's your crank sensor, but there's some real good people on here that hopefully will help you out better than I can. Let me know what happens😄

 

Well this was a strange one;
First off, the manual was correct, replace CKP sensor first lol

Sensor cost me $95CA total, glad it was the ECU
I asked about the price of ECU and dealer said it was a protected order and needed VIN ownership etc to even get a price.

Ask approx how much and would just say a couple grand, wow.


What was really weird was, the resistance of sensor was good, the AC voltage was in range but it wouldn't fire (and set hard DTC, I am thinking the dtc present had the ecu to cut fuel and spark)

Also, when cranking I had the fuel pump prime and run, with CKP unplugged the pump did not run.
So it was sending some sort of signal.
That is another reason I didn't think it would be the sensor.

One other thing I noticed (which did point me to CKP in the first place) was
with ign on and in gear, moving the bike to rotate the engine a bit, I always hear the pump run, with this sensor it did not.

Well I am glad she is running and I hope this info may help some one in the future if needed.

 

Glad your up and running again.

 

Oh Brother, so AM I!!!!! lol
been a long 3 days stuck in a cage!

 

Glad you got it fixed, I have been picking up spare electrical parts on eBay, look for old stock I picked up a ignition module for us100, a fraction of the price. As our bikes get older these parts are harder to get, also nice for diagnostic purpose.
FYI the ignition can be changed no problem, the tssm is another animal.

 

Glad you got it fixed, I have been picking up spare electrical parts on eBay, look for old stock I picked up a ignition module for us100, a fraction of the price. As our bikes get older these parts are harder to get, also nice for diagnostic purpose.
FYI the ignition can be changed no problem, the tssm is another animal.
The number is on your module.

 

Yes for sure HarleyCruiser,
I am glad the dealer had the Ckp sensor in stock

This is EFI
I didn't see any numbers on the ecu itself, but I didnt take it out of the bracket, could be on the under side