ELECTRICAL SYSTEM AND TESTING
Test Procedures
Page 11-18
2005 Precedent IQ System Electric Golf Car Maintenance and Service Manual
11
MCOR Voltage Test without the IQDM Handset, Continued:
6. With multimeter set to 20 volts DC, place the black (–) probe on battery no. 4 negative post and the red
(+) probe (with insulation-piercing probe) on the no. 18 yellow wire at a point close to three-pin connector
at the MCOR. The reading should be approximately 0.32 volts with the pedal up. Slowly press the accel-
erator 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-
ing...” in General Warnings, Section 1, Page 1-1.
8.2. Disconnect the 16-pin connector at the speed controller.
8.3. 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
purple 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/black 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.
TEST PROCEDURE 5 – A1 AND A2 MOTOR VOLTAGE
See General Warnings, Section 1, Page 1-1.
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 rails just forward of each spring mount.
See WARNING “Lift only one
end...” in General Warnings, Section 1, Page 1-2. See also following WARNING.
ý
WARNING
• Keep people and equipment clear from rotating rear wheels. Do not allow persons under the
car. Contact with rotating rear wheels could result in serious personal injury.
2. With the batteries connected and using a multimeter set to 200 volts DC, place the black (–) probe on
the A2 motor terminal (white wire) and connect the red (+) probe to the A1 (green wire) motor terminal.
3. With Tow/Run switch in the RUN position, place the Forward/Reverse switch in the FORWARD position,
turn key switch to the ON position and slowly press accelerator pedal.
4. As the accelerator pedal is pressed, the voltage reading should increase from approximately 5 volts RMS
when the MCOR limit switch closes, to approximately 48 volts RMS with the accelerator pedal fully
pressed.
