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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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02-03-2017, 11:01 AM | #11 |
Gone Mad
Join Date: Oct 2009
Location: Buford, GA
Posts: 8,988
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Re: ITS problem?
I don't recall the reading on my ITS, but it wasn't open. What range did you have your ohmmeter set on?
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02-03-2017, 12:54 PM | #12 |
Gone Insane
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
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Re: ITS problem?
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02-03-2017, 05:08 PM | #13 |
Not Yet Wild
Join Date: Dec 2014
Location: Myrtle Beach, SC
Posts: 21
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Re: ITS problem?
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02-03-2017, 05:27 PM | #14 |
Not Yet Wild
Join Date: Dec 2014
Location: Myrtle Beach, SC
Posts: 21
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Re: ITS problem?
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02-03-2017, 05:47 PM | #15 |
Gone Mad
Join Date: Oct 2009
Location: Buford, GA
Posts: 8,988
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Re: ITS problem?
Are you measuring the actual ITS, or the wires in the MOLEX plug?
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02-03-2017, 09:05 PM | #16 |
Not Yet Wild
Join Date: Dec 2014
Location: Myrtle Beach, SC
Posts: 21
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Re: ITS problem?
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02-03-2017, 09:54 PM | #17 |
Gone Mad
Join Date: Oct 2009
Location: Buford, GA
Posts: 8,988
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Re: ITS problem?
Sounds like your ITS is bad. Is the case cracked?
They aren't cheap. Do you have a friend with an ITS buggy, to try his in yours? If not, look on the "for sale" forum on this site. You might get lucky. |
02-04-2017, 10:35 AM | #18 |
Not Yet Wild
Join Date: Dec 2014
Location: Myrtle Beach, SC
Posts: 21
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Re: ITS problem?
I'll inspect the ITS when I take it out. Unfortunately, I don't have a friend whose ITS I can borrow for a test. Since it looks like everyone is reading some resistance other than open, I guess I'll have to bite the bullet. You are right, they are not cheap. It'll be the end of the week before I can take it out and check it. Thanks for your help.
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02-04-2017, 12:28 PM | #19 |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: ITS problem?
The ITS sensor is a proximity detector whose current (amperage) throughput varies with the relative proximity of the iron slug moved by the throttle pedal.
Attached is a schematic of what is inside the sensor. Also attached is how to test the ITS circuit, two thirds of which is inside the PDS controller. The ITS voltages are measured with the Negative Test lead attached to the main negative terminal of the battery pack. FWIW: Measuring the voltage between the black and white wires is how to check the ITS circuit when an Alltrax Controller is installed - The same ITS sensor is used, but Alltrax powers it differently, probably to avoid Patent infringements. (The ITS patent document is also attached - it contains a theory of operation for the device.) -------- The original voltages posted were within specs for a PDS controller. The voltage on Pin-4 is low when pedal is down, but the 15V +/-1V spec is with pedal up. Also a bad ITS sensor isn't consistent with the symptoms stated in the first post of this thread. Going a few feet and stopping is typically a solenoid not activating or a solenoid with bad contacts. Traveling further when pedal is only partially pressed is a further indication of a solenoid issue. Basically, the charge placed on the filter capacitors via the pre-charge resistor has enough energy to move the cart a few feet, and if the charge had been replenished by the battery pack being directly connected via the solenoid contacts, the cart probably would have kept moving. ----------- Personally, I'd reconnect everything and measure the ITS voltages again as show in the troubleshooting tree with negative test lead attached to B- at battery pack. |
02-04-2017, 05:35 PM | #20 | |
Not Yet Wild
Join Date: Dec 2014
Location: Myrtle Beach, SC
Posts: 21
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Re: ITS problem?
Quote:
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