Vertical cylinder issues - maybe

So my saga continues after seeing differing vacuum between to H and V cylinders. I got this down to the electrical terminal for the V cylinder after swapping MAP sensors and vacuum lines. Originally I thought it was due to a resistance difference on the H and V sense lines, but today they both measured 1 ohm. I even pulled the female pin out and measured just that and got the same measurement.

The situation is basically this, if I unplug the V MAP sensor (electrically) it idles fine, but if I only unplug the H MAP sensor then it stalls in under 40 seconds.

The bike now runs Tuneboy and did have the O2 sensors disconnected. I've just reconnected them to eliminate another variable. The dyno showed a very level 13.6:1 ratio, but after riding I can smell a rich mixture and feel it between 2500rpm and 5000rpm. It pulls well and gets about 170km/12L tank. Cruising is where it doesn't feel right, but it doesn't show on the dyno.

Any thoughts? I'm thinking the computer isn't reading the signal right from one of the MAP sensors, but it's been flashed with TB and this was present before flashing. Ive also done a vacuum test and got -25kPa on both cylinders.

Did you check the resistance and voltage at the side stand switch? The H /V MAP, side stand, quick shifter all ride in that switched 5 v circuit. I had a very similar issue with the 1299 when we swapped out the Trans Logic QS with the Cordona. Same running conditions as you described. We swapped MAPs, ETV assemblies, bypassed wiring to the ecu etc. Figured it was the Cordona as the bike ran fine with the TL QS. Problem is, the other bike ran fine with the Cordona. It was maddening. Turns out the resistance in the side stand switch was off but the TL was tolerant enough to work with it, the Cordona was not. So I replaced the side stand switch and it was perfect. Not saying this is your issue but electrically Everything on that 5v circuit is potentially a suspect.

+1 on that. I had a BMW with a windshield that would raise and lower automatically or manually. The switch for it was on the left handlebar and because of the CAN bus system something else on the same handlebar caused it to get stuck raised up. Signals crossed or something.

endodoc said:

Did you check the resistance and voltage at the side stand switch? The H /V MAP, side stand, quick shifter all ride in that switched 5 v circuit. I had a very similar issue with the 1299 when we swapped out the Trans Logic QS with the Cordona. Same running conditions as you described. We swapped MAPs, ETV assemblies, bypassed wiring to the ecu etc. Figured it was the Cordona as the bike ran fine with the TL QS. Problem is, the other bike ran fine with the Cordona. It was maddening. Turns out the resistance in the side stand switch was off but the TL was tolerant enough to work with it, the Cordona was not. So I replaced the side stand switch and it was perfect. Not saying this is your issue but electrically Everything on that 5v circuit is potentially a suspect.

Click to expand...

When you say that the resistance across the side stand switch was off, what resistance were you expecting and what was it? I'm going to do some more tests this weekend. The other sensors on the line are the engine and air temperature. The side stand only shares the ground wire back to the ECU, but it might be different between the 1199 and 1299......

I also rode yesterday with only the horizontal MAP sensor connected. At idle it was running super rich (enough to make my eyes water). I don't think I'll be able to attempt the same for the vertical as the bike stalls out without the horizontal connected.

I’ll have to check the notes. I understand the schismatic. I’ll have to look at the 1299/1199 but I believe they are the same and yes the air sensor is in that as well. Exact scenario was as follows. When I swapped to the Cordona, I got a dash error and the bike would barely intermittently start, backfire etc. basically wouldn’t run. Plug the TL back in, no issues. After all the trouble shooting and verifying that the Cordona worked on another bike I swapped the side stand switch with another unit and the dash error (gear warning) went away and the bike ran great with the Cordona. We took readings from both side stand switches (I assume resistance and voltage) and they were different. The new side stand switch solved all issues.

Just tested the voltage from the signal wires on the map sensors:
Not running
V - 4.13v
H - 4.13v

Running at idle (average)
V - 2.75v
H - 2.85v

When I did the vacuum test there was a 2kPa difference between the cylinders, but I doubt that's going to cause any significant issues.

I'm not sure how anything else on that circuit could affect it as the signal wire is a dedicated line, only the ground is shared.

I'm starting to think I might just have to tune around it using the MAP tables in the Tuneboy software....

There is a member here Gunmoto who is a wiz with the Duc electrical system. He helped me with my issue and is actually building custom harnesses maybe hit him up for his thoughts. I know that circuit seems straight forward with regard to the common ground and that’s why it took so long to figure out. Made no sense