ELECTRICAL SYSTEM AND TESTING
Test Procedures
Page 11-34
2005 Precedent IQ System Electric Golf Car Maintenance and Service Manual
11
TEST PROCEDURE 13 – MOTOR SPEED SENSOR
See General Warnings, Section 1, Page 1-1.
Motor Speed Sensor Test with the IQDM Handset
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CAUTION
• Perform the following procedure only on a level surface. To avoid injury or property damage,
ensure that the path of the vehicle is clear before pushing vehicle.
1. Turn the key switch to the OFF position and place the Forward/Reverse switch in the NEUTRAL position.
2. Connect the IQDM to the vehicle as described in the IQDM Owner’s Manual.
3. Access the Test menu and select SPEED PULSES by using the SCROLL DISPLAY buttons. The IQDM
should indicate OFF when the vehicle is at rest.
4. While monitoring the IQDM display screen, slowly push the vehicle a short distance (about 3 feet (1
meter)). The IQDM should indicate ON for speed sensor pulses while the wheels are in motion.
5. If the IQDM does not indicate ON while the wheels are in motion, proceed to the following procedure,
Motor Speed Sensor Test without the IQDM Handset.
Motor Speed Sensor Test without the IQDM Handset
1. Turn the key switch to the OFF position and place the Forward/Reverse switch in the NEUTRAL position.
2. With batteries connected, disconnect the three-pin connector at the motor speed sensor.
3. Check voltage at black/white wire:
3.1. Using a multimeter set to 200 volts DC, place the red (+) probe on the battery no. 1 positive post
and place the black (–) probe on the black/white wire terminal socket in the three-pin connector.
The voltage reading should be 48 to 50 volts (full battery voltage).
3.2. If the reading is zero volts, check the continuity of the black/white wire from the 16-pin connector
at the speed controller to the three-pin connector at the motor speed sensor. If the continuity is cor-
rect, replace the speed controller.
4. Check voltage at the red motor speed sensor wire:
4.1. With Tow/Run switch in the RUN position and using a multimeter set to 20 volts DC, place the black
(–) probe on the battery no. 4 negative post and place red (+) probe on red wire terminal socket in
three-pin connector. The voltage reading should be approximately 15-16 volts.
4.2. If the voltage reading is zero volts, check the continuity of the red wire from the 16-pin connector
at the speed controller to the three-pin connector at the motor speed sensor. If the wire continuity
is correct, replace the speed controller.
4.3. If the reading is below 14 volts, replace the speed controller.
4.4. If the voltage reading is correct, proceed to the following step.
5. Check voltage at the light green wire:
5.1. Using a multimeter set to 20 volts DC, place the black (–) probe on the battery no. 4 negative post
and place the red (+) probe on the light green wire female terminal in the three-pin connector at the
motor speed sensor. The voltage reading should be from 4.60 to 4.90 volts.
5.2. If the voltage is zero volts, check the continuity of the light green wire from the 16-pin connector at
the speed controller to the three-pin connector at the motor speed sensor. If the continuity is cor-
rect, replace the speed controller.
5.3. If reading is below 3.50 volts, check the continuity of the wires and plug and replace the speed con-
troller if necessary.
