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Unread 07-29-2019, 09:14 PM   #1
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Default 2015 CC stutters

A mate of mine has a 2015 CC which is fully standard. The batteries are not perfect but he has been keeping the Save-a-Battery on them between ERIC charges and he says that they are showing a healthy charge.

When he's on the golf course after a few holes the CC will "stutter" under acceleration. By that I mean (his description) that it stops accelerating for a moment then starts again and does it a few times.

At this stage I haven't driven it or taken any measurements but I thought I'd present the problem and get some opinions first.

Any opinions as to why it would do that?
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Unread 07-29-2019, 09:16 PM   #2
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Default Re: 2015 CC stutters

More than likely batteries but it could be an MCOR issue. You need to load the batteries when the cart is acting up. How old are they?


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Unread 07-29-2019, 09:25 PM   #3
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Default Re: 2015 CC stutters

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Originally Posted by twilliams81 View Post
More than likely batteries but it could be an MCOR issue. You need to load the batteries when the cart is acting up. How old are they?


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He's tried the old MCOR trick of pumping it in Neutral and it makes no difference. As far as we know the batteries are original (he's had the cart for about two years) and would be the standard CC fit. So that makes them about 4 years old. I don't think they were particularly well looked after by the original owner(s) but their performance has increased as he has been looking after them. When he first got the cart the light would come on before he got around eighteen holes but now he can make eighteen OK before the light comes on.

I agree that it is probably batteries but I wondered if anyone had seen this before as another problem.
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Unread 07-29-2019, 09:32 PM   #4
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Default Re: 2015 CC stutters

In have and 90% if the time it’s batteries. Again you’ll need to load test them when the cart is acting up and find your culprit battery or batteries.


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Unread 07-29-2019, 09:36 PM   #5
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Default Re: 2015 CC stutters

Usually on a Sepex cart they do not shutter and shake as the a Series wound motor will. From his description that sounds like a Speed Sensor issue as he mentions "that it stops accelerating for a moment then starts again and does it a few times." Intermittent is common, but harder to pinpoint and/or test for as they will only fail the test when they are actually in fault status.

If his pedal position is not changing when this surge is occurring, then that more accurately pinpoints a speed sensor issue. Usually a battery issue gets worse and not better. Definitely check the pack, too. This could be an anomaly or.....?
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Unread 07-29-2019, 09:43 PM   #6
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Default Re: 2015 CC stutters

When I hear someone say “stuttering” I’m thinking of the cart “bucking” and 9 times out of 10 that’s a battery issue. Anything is possible but if it’s “bucking” then you know it’s usually battery related.


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Unread 07-29-2019, 09:51 PM   #7
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Default Re: 2015 CC stutters

Quote:
Originally Posted by twilliams81 View Post
When I hear someone say “stuttering” I’m thinking of the cart “bucking” and 9 times out of 10 that’s a battery issue. Anything is possible but if it’s “bucking” then you know it’s usually battery related.
I agree and that is prominent in Series carts. By the description the OP gave Yawood, it sounds different than the that and coupled with this being a Sepex cart. Intermittent speed sensors will do exactly what he described. That does not mean it is the issue, but is a factor in its assessment.
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Unread 07-30-2019, 01:20 AM   #8
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Default Re: 2015 CC stutters

Thanks everyone. The cart doesn't "buck" as such just dies for a moment then picks up again only to die again and pick up again.

I'll start taking some measurements soon but I wanted some expert knowledge to know if there was anything likely other than batteries.

Nole, where is the speed sensor you speak of and is there a way of testing it?

p.s. His pedal position is not changing as it occurs.
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Unread 07-30-2019, 07:56 AM   #9
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Default Re: 2015 CC stutters

Quote:
Originally Posted by yawood View Post
Thanks everyone. The cart doesn't "buck" as such just dies for a moment then picks up again only to die again and pick up again.

I'll start taking some measurements soon but I wanted some expert knowledge to know if there was anything likely other than batteries.

Nole, where is the speed sensor you speak of and is there a way of testing it?

p.s. His pedal position is not changing as it occurs.
It is located on the back of the motor and has a 3-wire plug. It will most likely be a "Top-Hat" design sensor for ADC motors. To test it you get out your DVM/VOM, place the black (–) probe on the battery main pack Negative post and place the red (+) probe on the green wire between the 3-pin connector and the motor speed sensor. Raise "only" one rear wheel off ground. Slowly turn the rear wheel to rotate the motor armature. As the armature rotates, the voltage reading should alternate from 0vdc to approximately 4.85vdc. The voltage reading will fluctuate from zero to 4.85vdc and back to zero four times for each revolution of the motor armature. (The voltage reading of 4.85vdc is an approximate reading; the actual reading may vary from 4.50vdc to 5.00vdc). Replace the speed sensor if there is no voltage reading, voltage reading is not above 3.50vdc, or the voltage reading does not fluctuate as the motor is turned. (You can check the signals from the controller by placing the Red probe (+) on MPP post and place the Black (–) probe on the black/white wire in the 3-pin connector. The voltage should be 48 volts or pack voltage. Now place the Black (–) probe on the MPN post and place Red (+) probe on red wire in the 3-pin connector. The voltage reading should be approximately ~15-16 volts. If <14vdc is is a controller issue.)
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Unread 07-30-2019, 08:28 AM   #10
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Default Re: 2015 CC stutters

Thank you
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