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Old 11-13-2017, 03:30 PM   #1
JeepFreak843
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Default 09 ds won't keep speed

I have an 09 club car ds and have changed the mcor1 and the speed sensor and the cart will take off fast then slow down to about 10 mph.... batteries are fine....
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Old 11-13-2017, 03:52 PM   #2
Sergio
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Default Re: 09 ds won't keep speed

With the key switch OFF, when you push the cart by hand does it offer resistance and beeps the buzzer?
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Old 11-13-2017, 04:31 PM   #3
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Default Re: 09 ds won't keep speed

It does not
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Old 11-13-2017, 04:38 PM   #4
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Default Re: 09 ds won't keep speed

Possible Causes:
Missing magnet.
Broken wire from controller to speed sensor.
Bad speed sensor.
Bad controller.
You should be able to easily see if the magnet is still attached to the end of the Motor shaft.

If so, disconnect the 3-pin connector from the speed sensor and measure the voltage between the Red and Black wires, You should get +15v.

If You do get the +15v, check the continuity between the Green wire and Controller pin #14, if You have continuity, the issue is most likely another bad sensor.
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Old 11-13-2017, 04:56 PM   #5
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Default Re: 09 ds won't keep speed

I replaced the magnet and the speed sensor so tomorrow I will check the wires.... my handheld computer is saying it's a speed sensor fault and I tried 2 speed sensors.... is there a sonic weld between those wires??
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Old 11-13-2017, 05:02 PM   #6
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Default Re: 09 ds won't keep speed

No sonic weld on an DS IQ speed sensor harness.

Test the voltages at the 3-pin connector.
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Old 11-14-2017, 01:30 PM   #7
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Default Re: 09 ds won't keep speed

The 3 pin connector was red to black 16.45v and green to black was 4.99v with the cart off
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Old 11-14-2017, 01:31 PM   #8
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Default Re: 09 ds won't keep speed

Green to red 9.88v
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Old 11-14-2017, 03:04 PM   #9
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Default Re: 09 ds won't keep speed

Quote:
Originally Posted by JeepFreak843 View Post
The 3 pin connector was red to black 16.45v and green to black was 4.99v with the cart off
This is spot on, the next thing to test is if the speed sensor is actually working.

You will need an insulation piercing probe for your meter or a way to probe the green wire while it is still connected to the speed sensor.

The voltage on the green wire (in relation to B- or the black wire) should keep changing from 5v to 0v as you very slowly turn one of the rear wheels.

If the green wire does not change to 0v, the speed sensor is bad.

If the voltage changes, the controller is bad.
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Old 11-14-2017, 03:28 PM   #10
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Default Re: 09 ds won't keep speed

It is going from 4.99 to 2.46 when slowly hit the pedal... so that means the speed sensor is bad?
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