ELECTRICAL SYSTEM AND TESTING
Troubleshooting
2008-2011 IQ Plus Electric Vehicle Maintenance and Service Supplement
Page 11-39
11
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. 8 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 24-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. Set a multimeter to 20 volts DC. Place the black (–) probe on the battery no. 8 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 5.00 volts.
5.2. If the voltage is zero volts, check the continuity of the light green wire from the 24-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-
Figure 11-28 Test 13: Speed Sensor Black/White Wire
Figure 11-29 Test 13: Speed Sensor Red Wire
