IQ PLUS SYSTEM DISPLAY MODULE (IQDM SERIES 2) DIAGNOSTICS
Faults Menu
Page 12-8
2006 IQ Plus System Electric Vehicle Maintenance and Service Supplement
12
Miles x 0.1
Displays the number of miles the vehicle has been driven measured in tenths of a mile.
FAULTS MENU
The
faults
menu is accessed by using the up or down arrow to scroll to
faults
and pressing the right arrow key
to activate the menu.
Faults displayed in the
faults
menu will aid the trained technician in troubleshooting the vehicle. Faults dis-
played often indicate which components in the electrical system need to be tested.
Since the
faults
menu is updated while the vehicle is in operation, the trained technician has the ability to mon-
itor the occurrence of faults in conditions or locations where a problem with vehicle performance has been
reported.
See following Warning.
ý
WARNING
• The vehicle operator should not monitor the handset while the vehicle is in motion. A
SYSTEM FAULTS
The
system faults
menu displays all of the faults detected by the speed controller since the last time the fault
history has been cleared. The faults displayed in this menu may or may not be currently active. Once a fault
has been detected, it is stored in the memory of the speed controller for display on the
fault history
menu.
Each detected fault is listed only once, even if the fault has occurred multiple times.
Causes of Faults
Some common causes of faults are
•
Loose, broken, or disconnected wires or connectors
•
Failed components
•
Improper adjustment or installation of electrical or mechanical components (examples: brake adjust-
ment, improper MCOR installation)
•
Improper wiring of electrical components
As shown above, there are many possible causes for faults to occur, and the speed controller has a pro-
grammed reaction to each fault that is based on the fault currently detected. The technician should be familiar
with the detected faults and the controller’s reactions to faults to ensure a proper diagnosis.
An example of a possible mis-diagnosis of a vehicle due to a fault: If the three-pin speed sensor wire has been
disconnected, the speed controller will detect a
speed sensor
fault. When a
speed sensor
fault is detected,
the controller responds to the fault by limiting the vehicle speed to 1/2 of its normal top speed. If the technician
reaches the conclusion that the vehicle is running slowly because batteries are heavily discharged, he has
made an improper diagnosis of the problem.
The vehicle speed controller should be checked for fault codes before any service is performed.
The speed controller, after detecting a fault, will respond in one or more of the following ways:
1. Reduce vehicle speed to zero by reducing armature current to zero
2. Reduce vehicle speed to zero by reducing field current to zero
