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Rubber Mount Sportster Motorcycle Talk (2004-2006) This area is to discuss issues, problems and anything else unique to the 2004 and above Sportster motorcycles

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icm, no spark, starting issues

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  #31  
Old 30th March 2020
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Quote:
Originally Posted by IXL2Relax View Post
Be sure to put your meter on each fuse and make sure power is coming out of each fuse when the Keyswitch is in the ON position.

Complete the other tests I suggested previously.


By the way,
A) what was the actual voltage reading across the battery when the Keyswitch was OFF?
B) What was the actual voltage reading across the battery while cranking the engine?


As more & more things appear correct, you will need to do alternative testing of the same devices to find out if they are working.

There are tests in the Sportsterpedia section on the Coil to provide a way to Manually Trigger Coils For Testing Spark:
http://sportsterpedia.com/doku.php/t..._testing_spark

Keep moving along the previous list of checks from my previous post - If all tests appear to confirm the Coil is good, then do the manual spark test above to confirm that the coil actually fires a spark from each internal coil thru each external plug wire to the spare spark plug.


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currently the battery voltage is at 12.11 volts. i haven't put a charge on it since putting it in the bike and do various tests and start attempts .
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  #32  
Old 30th March 2020
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Quote:
Originally Posted by jimstogs View Post
currently the battery voltage is at 12.11 volts. i haven't put a charge on it since putting it in the bike and do various tests and start attempts .
AGM Battery Charge Level (SP)
Voltage Reading ... 12.7 ... 12.6 ... 12.3 ... 12.0 ... 11.8
Percent Charged .. 100% .. 75% ... 50% ... 25% ... 0%


B) What was the actual voltage reading across the battery while cranking the engine?

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Last edited by IXL2Relax; 30th March 2020 at 04:04..
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  #33  
Old 30th March 2020
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Quote:
Originally Posted by IXL2Relax View Post
AGM Battery Charge Level (SP)
Voltage Reading ... 12.7 ... 12.6 ... 12.3 ... 12.0 ... 11.8
Percent Charged .. 100% .. 75% ... 50% ... 25% ... 0%


B) What was the actual voltage reading across the battery while cranking the engine?

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when I first put the battery in it was over 100%, It isn't the battery I am sure of that. I am wondering if there is a way to better understand 2 things, 1) the CKP and 2) the TSM, everything else is checking out fine, as far as the CKP I got AC voltage out 4.4 volts, is that all that is needed to verify it?
Since the stealers are the only ones "That I know of" with the equipement to read the SDB i guess the TSM remains a mysterious magic box. IXL appreciate all you are doing to help!!
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  #34  
Old 30th March 2020
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So today, based on IXL questioning whether I had the ac voltage coming from the CKP at the ICM as well as coming straight from the sensor, so I put the TSM and battery back in, and put the charger on the battery. I then turned the motor over and checked AC at those connections, well what do you know, after knowing for sure the signal wasn't getting there I got under and found the connector had indeed come loose. put it back together, checked for signal, it was there so put ICM back and started it up..... Thank you to all that helped get me here!! especially IXL and oldboy. Thank you, Thank you, Thank you.
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  #35  
Old 30th March 2020
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Great to hear you found and fixed the issue! I, like you, am now left with questions on the way the tssm (which my bike has) functions. I sussed through my schematics and am at a loss to understand how the tssm disables the ignition. It is too late today to get back out, bot I plan on pulling the tssm and digging into it further tomorrow.
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  #36  
Old 31st March 2020
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Originally Posted by oldboy View Post
Great to hear you found and fixed the issue! I, like you, am now left with questions on the way the tssm (which my bike has) functions. I sussed through my schematics and am at a loss to understand how the tssm disables the ignition. It is too late today to get back out, bot I plan on pulling the tssm and digging into it further tomorrow.
:t our
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  #37  
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Quote:
Originally Posted by jimstogs View Post
I then turned the motor over and checked AC [from the CKP] at those connections, well what do you know, after knowing for sure the signal wasn't getting there I got under and found the connector had indeed come loose. put it back together, checked for signal, it was there so put ICM back and started it up...
Glad to see you found the issue... Many times we expect something much more complicated... It's one of the reasons I promote the idea of:

To Be Succesful - Be Patient, Be Accurate, Be Methodical & Be Thorough...

I know this is contrary to the way most people approach fixing their problems - They like to jump in and starting checking here there and everywhere 'hoping and praying' the problem with be found or fixed by coincidence...

There is another side to being methodical - We get to maintenance issues that we might otherwise overlook - which will cause more unexpected failures down the road.

By being Patient, Accurate, Methodical & Thorough we will find the current problem but also prevent being bothered by more down time later.

==========

As to the TSM - The Serial Data Bus is an intelligent communications connection between the ICM, TSM & Speedometer. This intelligent link allows these devices to communicate all kinds of information back and forth without external individual wires for individual functions.

The TSM can communicate all kinds of conditions to the ICM and the ICM can reply with info back the TSM (and the Speedo).

So, in this case, the internal BAS condition in the TSM can be communicated to the ICM to prevent further spark signals.

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Last edited by IXL2Relax; 31st March 2020 at 10:38..
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  #38  
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The fsm schematic is right, no wire on connector 30b, position 10, it's empty. My guess is that the tsm/tssm 1) enables/disables the starter circuit by making or breaking the ground path for the starter relay coil on pin 9 and 2) kills the ignition (in a tip over) by grounding out the circuit.
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