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Unread 09-14-2014, 01:40 PM   #1
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Default 2004 club car precedent. I'm not sure if this is an MCOR issue

I have a 2004 club car precedent. Recently I have noticed that when I pressed the accelerator pedal the car will not move nor do I hear it click. If i continue to press the pedal several time or do it very slowly I can get it to click and then it will go. Once going it seems to run fine, it's just getting it to go is the issue. Sometime I can just hold the pedal to the floor for a length of time and then it's like it will recognize it and take off. Thanks for any and all help.
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Unread 09-14-2014, 02:23 PM   #2
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Default Re: 2004 club car precedent. I'm not sure if this is an MCOR issue



Quote:
Originally Posted by cheapjeep2 View Post

Procedure to test an MCOR with a Volt Meter

MCOR Voltage Test without the IQDM Handset
1. Place chocks at the front wheels and lift the rear of the vehicle with a chain hoist or floor jack. Position
jack stands under the frame cross member between the spring mount and side stringer, just forward of
each rear wheel. See WARNING “Lift only one end...” in General Warning, Section 10, Page 10-1.
See following NOTE.
NOTE: The key switch should be placed in the OFF position and left in the OFF position for the duration of
this test.
2. With the batteries connected, place Tow/Run switch in RUN. Using a multimeter set to 200 volts DC,
place red (+) probe on battery no. 1 positive post and place black (–) probe (with insulation-piercing
probe) on the purple/white wire (1) at a point close to the three-pin connector at the MCOR (Figure
11-11). The reading should be approximately 48-50 volts (full battery voltage).
Figure 11-11 Test MCOR: Purple/White Wire (+)
ELECTRICAL SYSTEM AND TESTING Troubleshooting
2008 IQ Plus Electric Vehicle Maintenance and Service Supplement Page 11-19
11
3. If reading is zero volts, check the purple/white wire continuity from the three-pin connector at the MCOR
to the 24-pin connector at the speed controller. Check terminal positions in three-pin connector at the
MCOR and the 24-pin connector. If all of the continuity readings are correct and the connectors are wired
correctly, replace the speed controller.
4. With multimeter set to 20 volts DC, place the black (–) probe on battery no. 8 negative post and the red
(+) probe (with insulation-piercing probe) on the white wire (2) at a point close to the three-pin connector
at the MCOR (Figure 11-12). The reading should be approximately 4.65 volts.
5. If reading is zero volts, check the white wire continuity from the three-pin connector at the MCOR to the
24-pin connector at the speed controller. Check terminal positions in three-pin connector at the MCOR
and the 24-pin connector. If all of the continuity readings are correct and the connectors are wired correctly,
replace the speed controller.
6. With multimeter set to 20 volts DC, place the black (–) probe on battery no. 8 negative post and the red
(+) probe (with insulation-piercing probe) on the yellow wire (3) at a point close to three-pin connector at
the MCOR (Figure 11-13). The reading should be approximately 0.32 volts with the pedal up. Slowly
press the accelerator pedal and note the readings on the multimeter. As the pedal is pressed, the reading
should increase until it reaches 4.65 volts when the pedal is fully pressed.
7. If reading does not increase as the pedal is pressed, replace the MCOR.
8. If the reading is not approximately 4.60 volts with the pedal fully pressed, the vehicle will not operate at
rated top speed. Check the MCOR resistance.
8.1. Disconnect the battery cables as instructed. See WARNING “To avoid unintentionally start-
Figure 11-12 Test MCOR: White Wire (+)
Figure 11-13 Test MCOR: Yellow Wire (+)
Passenger Side Frame Rail
3
ELECTRICAL SYSTEM AND TESTING Troubleshooting
Page 11-20 2008 IQ Plus Electric Vehicle Maintenance and Service Supplement
11
ing...” in General Warning, Section 10, Page 10-1.
8.2. Disconnect the 24-pin connector at the speed controller.
8.3. Set a multimeter to 20k ohms. Connect the red (+) probe of the multimeter to the yellow wire at the
MCOR three-pin connector with an insulation piercing probe. Connect black (–) probe to the purple/
white wire with an insulation-piercing probe.
8.4. With the accelerator pedal fully up (not pressed), the multimeter should read approximately 1k
ohms.
8.5. Slowly press the accelerator pedal while monitoring the multimeter. The resistance should rise as
the pedal is pressed. When the pedal is all the way to the floor, the multimeter should indicate
between 5.67k ohms and 7.43k ohms.
8.6. Using a multimeter set for 20k ohms, connect the red (+) probe of the multimeter to the yellow wire
at the MCOR three-pin connector with an insulation piercing probe. Connect black (–) probe to the
white wire with an insulation-piercing probe.
8.7. With the accelerator pedal fully up (not pressed), the multimeter should indicate between 5.67k
ohms and 7.43k ohms.
8.8. Slowly press the accelerator pedal while monitoring the multimeter. The resistance should drop as
the pedal is pressed. When the pedal is all the way to the floor, the multimeter should indicate
approximately 1k ohms.
8.9. If the MCOR does not operate as described, replace the MCOR.
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Unread 09-14-2014, 09:22 PM   #3
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Default Re: 2004 club car precedent. I'm not sure if this is an MCOR issue

It looks like the procedure you posted to check the MCOR left out the procedure to check the switch inside the MCOR.
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Unread 09-14-2014, 09:37 PM   #4
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Default Re: 2004 club car precedent. I'm not sure if this is an MCOR issue

Quote:
Originally Posted by jjance View Post
It looks like the procedure you posted to check the MCOR left out the procedure to check the switch inside the MCOR.
thats because it's a sealed unit !!!

Quote:
Sometime I can just hold the pedal to the floor for a length of time and then it's like it will recognize it and take off
if micro switch is dead there will be no movement at all
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Unread 09-14-2014, 09:56 PM   #5
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Default Re: 2004 club car precedent. I'm not sure if this is an MCOR issue

Isn't there wires connected to it?
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Unread 09-14-2014, 10:09 PM   #6
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Default Re: 2004 club car precedent. I'm not sure if this is an MCOR issue

yes a plug with a green and blue wire.. if you use a meter set on continuity you can test the internal micro switch
but again he said "Sometime I can just hold the pedal to the floor for a length of time and then it's like it will recognize it and take off "
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Unread 09-16-2014, 09:54 AM   #7
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Default Re: 2004 club car precedent. I'm not sure if this is an MCOR issue

Thanks for the input. I will try to obtain a meter and check it. In your opinion, do you think it sounds like the MCOR? Or are you not sure?
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Unread 09-16-2014, 12:30 PM   #8
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Default Re: 2004 club car precedent. I'm not sure if this is an MCOR issue

IMHO, yea its the MOCR...be sure you replace it with the proper one
Motor Controller Input (Mcor) 48-Volt For Club Car Model Precedent Only 2004 & Up
UPDATEDS CLUB CAR MODEL PRECEDENT WITH MCOR2 AND GEN II PEDAL GROUP AND MCOR. INCLUDES A MCOR3, ADAPTOR WIRE HARNESS, MOUNTING SCREWS AND INSTRUCTIONS

http://blockbustergolfcarts.com/moto...2001-04-1.aspx
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Unread 09-16-2014, 12:30 PM   #9
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Default Re: 2004 club car precedent. I'm not sure if this is an MCOR issue

double post
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Unread 09-16-2014, 03:45 PM   #10
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Default Re: 2004 club car precedent. I'm not sure if this is an MCOR issue

Thanks again for all the help...I really appreciate it!
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