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Old 01-19-2019, 04:14 PM   #1
CobraEatr
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Default New Alltrax controller installed - cart jolts & throttle response is poor

I ordered an Alltrax XCT400, 200A solenoid, and 2G cables from Scottyb. I took my time and slowly installed everything. Afterwards I retraced all of my wires twice to make sure everything was installed correctly. I have both diodes installed in the right direction on the solenoid.

The cart does run, but it's very "jolty" and throttle response is about 3 seconds too late. Scottyb's instructions say that "the throttle auto calculating feature will take a few cycles to calculate to the cart's signal. The cart may operate unevenly until this function is complete. Simply go to full throttle and back a few times to allow the control to calculate your throttle signal."

I did the above dozens of times and the jolting and slow throttle response is still happening. I drove the cart for 3 or 4 miles and the problem is not correcting itself.

Any ideas?

2002 Club Car DS

Last edited by CobraEatr; 01-19-2019 at 04:21 PM.. Reason: Needed to
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Old 01-19-2019, 11:47 PM   #2
NoleFan4Ever
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Default Re: New Alltrax controller installed - cart jolts & throttle response is poor

When turn the key on does it flash the correct green lights?

Is the throttle set correctly for your type?
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Old 01-20-2019, 10:44 AM   #3
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Default Re: New Alltrax controller installed - cart jolts & throttle response is poor

Quote:
Originally Posted by NoleFan4Ever View Post
When turn the key on does it flash the correct green lights?

Is the throttle set correctly for your type?
I'm not sure what it is supposed to flash. When I plug my laptop in to the controller the green light flashes 5 times.

I don't know if the throttle is set correctly or not. I was under the assumption that it would be programmed specifically for my cart and then sent to me so that I could install it and be done with it.

What should I be seeing on the throttle settings?






Last edited by CobraEatr; 01-20-2019 at 10:52 AM.. Reason: Added pictures
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Old 01-20-2019, 11:14 AM   #4
Sergio
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Default Re: New Alltrax controller installed - cart jolts & throttle response is poor

So You have an IQ cart (Serial number starts with AQ).

You can try a few things.

Reset the auto-calibration again, then with the key switch ON and the cart in Neutral, press the pedal slowly from Up to Down a few times.

Change the Throttle rate to 40%.

Change the Speed curve so you are not varying the speed too much during the time the torque curve is almost vertical, something like this:






If the cart is still "jerking" after all those changes you can uncheck the "enable speed limit" to see if the issue is related to the speed sensor.
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Old 01-20-2019, 12:14 PM   #5
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Default Re: New Alltrax controller installed - cart jolts & throttle response is poor

Quote:
Originally Posted by Sergio View Post
So You have an IQ cart (Serial number starts with AQ).

You can try a few things.

Reset the auto-calibration again, then with the key switch ON and the cart in Neutral, press the pedal slowly from Up to Down a few times.

Change the Throttle rate to 40%.

Change the Speed curve so you are not varying the speed too much during the time the torque curve is almost vertical, something like this:



If the cart is still "jerking" after all those changes you can uncheck the "enable speed limit" to see if the issue is related to the speed sensor.
Thanks Sergio. I just tried all of those things. Still jerking wildly. I went to the Monitor section of the Alltrax software and noticed that with the key on and in neutral, as I pressed the throttle pedal slowly that the percentages being shown on the screen were jumping around all over the place. They would eventually settle at the point where I would keep my foot at, but it wasn't a smooth progression. For instance, I slowly pressed the gas from 0 to about 50% throttle and then held it at 50%. The software showed 0, 20, 0, 30, 17, 35, and then it held at 50%. Does this mean that something else is wrong (bad MCOR) or is the software just slow to load these numbers?
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Old 01-20-2019, 12:49 PM   #6
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Default Re: New Alltrax controller installed - cart jolts & throttle response is poor

It sounds like a MCOR problem, even if you endup replacing the MCOR, make sure there is not excessive "lateral pedal play" or it will eventually damage the new MCOR as well.

You can add a little shim to see if it helps, like in this post:
http://www.buggiesgonewild.com/elect...ml#post1443813
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Old 01-20-2019, 01:38 PM   #7
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Default Re: New Alltrax controller installed - cart jolts & throttle response is poor

Never mind about that shim, I forgot you have a DS and it has a entirely different pedal group.
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Old 01-20-2019, 02:37 PM   #8
NoleFan4Ever
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Default Re: New Alltrax controller installed - cart jolts & throttle response is poor

Yeah, sounds like a bad MCOR as long as there is no flags or an issue with the solenoid dropping out.
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Old 01-20-2019, 03:27 PM   #9
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Default Re: New Alltrax controller installed - cart jolts & throttle response is poor

Can he try the pedal scrub trick to confirm the MCOR is erratic.
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Old 01-20-2019, 03:57 PM   #10
Fairtax4me
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Default Re: New Alltrax controller installed - cart jolts & throttle response is poor

Like ScottyB says. Try scrubbing the MCOR wiper. Press the pedal to the floor and release about 30-40 times and see if that improves anything.

Also double check your MCOR wiring at the controller, check the pins in the MCOR connectors for dirt/corrosion.
You can also check MCOR output with an ohmmeter. An old style analog meter works well for potentiometer testing.
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