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Unread 04-05-2015, 02:12 PM   #1
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Default Precedent shutdown at full throttle. Excel

Hi all,

This one has been troubling me for a bit.

From the beginning,

Cart smoked its controller. You could smell the electrical burnt smell near it.

Got a refurbished excel controller with speed 4 installed.

Put it in and the cart started running again except if the throttle is all the way down the cart stopped accelerating and regen braking slows it down, back off on the throttle and it starts going again.

Plugged in the IQDM P and watch the throttle position. Somewhere around 90 percent it drops to zero and gives you the above symptoms.

I go for that as mcor issue and order replacement. No change.

Searching around on here. I find a thread that TDawg answered on. The tps adaptor has failed.

Ordered that, replaced, and still no change.

Now I have come full circle to the controller, is it possible this is a programming issue with the rebuilt controller, or just a defect, and it thinks its going out of range? Or is there something else I should look for?

Thanks for the help
Rom
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Unread 04-05-2015, 03:11 PM   #2
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Default Re: Precedent shutdown at full throttle. Excel

Measure the actual voltage on the yellow MCOR wire in relation to pack negative (meter on 20v DC scale).

The last time the TPS to MCOR adapter was discussed, TahoeDawg said that both versions (IQ and Excel) had the same part number.

I have no idea how the dealer can tell which ones have the resistors internally (Excel model) and which one don't (IQ model).

The 451Ω resistors will change the throttle signal as seen by the controller from 0-5v to 0.35-4.65v, so if You don't have the resistors in yours, it will give you a throttle fault (out of range) if it goes to 5v.
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Unread 04-05-2015, 03:26 PM   #3
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Ok I will be visiting the cart tomorrow. Will double check the readings. How would I go about correcting this if this is the fault?
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Unread 04-05-2015, 03:39 PM   #4
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Default Re: Precedent shutdown at full throttle. Excel

I'm following this thread to see how it develops.
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Unread 04-05-2015, 03:47 PM   #5
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Default Re: Precedent shutdown at full throttle. Excel

You can disconnect the 16-pin connector from the controller and the 3-pin connector from the MCOR.

Measure the resistance on each of the wires from the controller to the MCOR.

You should see approximately 451Ω, if you measure 0Ω instead, you have the wrong TPS adapter for an Excel cart.
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Unread 04-05-2015, 03:47 PM   #6
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Default Re: Precedent shutdown at full throttle. Excel

TPS (throttle position sensor?) Where would this be if not the MCOR?
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Unread 04-05-2015, 03:55 PM   #7
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Yea, got that. But how do I get the correct unit if the part number is the same?
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Unread 04-05-2015, 04:06 PM   #8
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Default Re: Precedent shutdown at full throttle. Excel

What's the part number on the TPS adapter?
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Unread 04-05-2015, 04:10 PM   #9
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Default Re: Precedent shutdown at full throttle. Excel

Sergio,

There must have been a misunderstanding somewhere. I don't recall ever saying the iq and excel adapters had the same part numbers. They are in fact different, but the IQ one is no longer available.
103682701 is the correct number for Excel cars
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Unread 04-05-2015, 04:11 PM   #10
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Default Re: Precedent shutdown at full throttle. Excel

David where is this adapter, I don't remember seeing it on mine?
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