I would really appreciate some assistance & guidance if its Ok to ask here?
I'll give you what I know and perhaps some light can be shed on things...
1. Bike comes in with error light on, battery over volatage ( 5.1 )
2. as in image uploaded, voltage spikes apparent and I thought regulator issue
3. replaced regulator & spikes rectified however error light still on.
4. today I noticed the volatge on the dash does NOT reflect actual battery voltage. Actual battery >14VDC dash displayed volatge max 12VDC
5. dash displayed battery voltage on this bike is via CAN line
6. ecu & dash grounds OK < .5 ohm
7. ecu to dash CAN line connections/wiring under .5 ohms.
As I am very new to scope use, CAN samples not yet taken however I have hooked up to known 2 CAN wires and data was not clear.
Should I check what is on the CAN line and watch the CAN signal as I disconnect sensors etc or some other approach.
Also does anyone know if Ducati (2005 model) use CAN high/low?
I have the genuine manual however it is not overly informative in relation to CAN type etc.
Thanks in advance.
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Last edited by dominic on Sat May 19, 2012 12:21 pm, edited 1 time in total.
Is there any chance you can upload the .psdata file as well as the screen grab. If you are still connected can you use a 20ms/div timebase rather than 5ms/div as this will ensure you have at least one complete engine cycle (everything happens at least once on the engine). I assume the trace is of battery voltage and current ?
One other thing when you say "Actual battery >14VDC dash displayed volatge max 12VDC" is this a voltmeter display on the dash. If so perhaps its a software thing with the bike? Does the dash normally ever display over 12V (a normal bike with the engine running will always have >12V but perhaps the bike display shows voltages below 12V to show there is a problem but above 12V it just shows 12V to signify there is enough voltage?
I will upload or PM what little .psdata I have, hopefully it will help.
It was batt voltage & current yes.
Actual battery voltage when tested at battery is over 14VDC. Yes, dash has displayed voltage and is inaccurate, and from manual is acquired via CAN. I do think from memory the dash will display correct voltage however I will test another very similar bike tomorrow ( dash cannot be swapped as coded to bike! NOT that I want to parts swap at all )
Alan, your suggestion of software issue is where I am at with it. The software is in the dash I would expect. If no software in dash then just the dash. I am just wanting to be able to diagnose and not guess.
I tested all dash loom wiring voltages and interestingly, left hand switch block function related voltages(that is - high beam, indicator, horn & hazard switches) were all in the 12vdc or lower region. All other 12v wiring was as expected, actual battery voltage or very close.
Yes, the battery is a suspect (as mentioned in other thread) unless already checked / swapped. Part of the job of a battery is to act as a capacitor smoothing out spikes / noise on the 12V lines.
If you are re-capturing the waveform please make sure the memory (no of samples) is turned up a bit. Its 1000 samples in your waveform. Try 100,000 or so to make sure you are sampling fast enough to capture any spikes.
It is one thing testing resistance & another load testing !
The grounds you checked check again with the bike running with the scope as a DMM. (black to ground (Batt -)red to ground being tested))
Does the dash receive the voltage from the ECU for the engine via CAN ?
Grab a CAN capture anyway & post it on here lets have a looksy
Just so you know i am not a bike guru but a few of us may be able to help with testing methods & possible results/captures.
Robski, thanks very much re load testing grounds. yes totaly agree & thanks for showing me how to do this with the scope. tested OK
Yes, batt voltage is CAN line. I found today using texa through diag port battery voltage stays at 11VDC BUT when I switch the bike off the min/max shows as you'd expect circa 11.5/14.9VDC - so I took the CAN snapshot
Not concerned who is bike guru or not you guys are a great help and methodology is going to be very similar I would expect.