ELECTRICAL SYSTEM AND TESTING: ELECTRIC VEHICLE
Troubleshooting
Page 21-4
2007-2008 XRT 800, 810 and 850 Maintenance and Service Manual
21
• Tow/Run Switch:
When the Tow/Run switch is in the RUN position, the vehicle will function normally.
When the switch is in the TOW position, power to the OBC and controller is shut off, disabling the vehi-
cle operating circuit and zero speed detect, allowing the vehicle to be towed.
• Motor Protection Circuit:
The operator should never attempt to hold the vehicle on an incline by
pressing the accelerator pedal instead of the brake pedal, as motor overheating could result. By reduc-
ing the current to the motor during such an occurrence, the motor protection circuit reduces the possi-
bility of motor damage. When this situation arises, a
motor stall
fault
is recorded by the speed controller
and will be displayed on an IQDM handset in the Diagnostic History menu.
See Motor Stall on
page 22-10.
• High Pedal Detect:
This function prevents unexpected vehicle movement if the key switch is turned
ON after the accelerator is pressed, or the accelerator pedal is pressed when Forward/Reverse switch
is used to change the direction of travel. The vehicle will not move until the accelerator is released and
pressed again. When this situation arises, a
HPD fault
is recorded by the speed controller and will be
displayed on a diagnostic and programming handset in the Diagnostic History menu.
See HPD on
page 22-9.
• Onboard Computer (OBC):
The OBC, 1) monitors battery condition, 2) monitors the number of
energy units used by the vehicle, 3) determines the number of energy units required to recharge the
batteries and shuts the charger off when this number is reached, 4) determines when to activate regen-
erative motor braking, 5) locks out vehicle movement while the charger is plugged into the vehicle
charger receptacle, 6) stores operating data, which can be read by the Communication Display Module
(CDM).
See Communication Display Module (CDM) on page 21-33.
TROUBLESHOOTING
The following troubleshooting guides will be helpful in identifying operating difficulties should they occur. The
guides include the symptom, probable cause(s) and suggested checks. The procedures used in making these
checks can be found in the referenced sections of this maintenance and service supplement.
TROUBLESHOOTING THE VEHICLE WITH THE DIAGNOSTIC HANDSET
We recommend the use of the diagnostic handset (IQDM) for troubleshooting vehicles equipped with the elec-
trical system. Troubleshooting Guide 1 is to be used in conjunction with the handset. Refer to the Diagnostic
Handset Owner’s Manual for operating instructions.
See also Section 22 – IQ Display Module (IQDM) and
IQDM-P Diagnostics. See following WARNING.
ý
WARNING
• The vehicle operator should not monitor the diagnostic handset while the vehicle is in motion.
A technician can monitor the diagnostic handset while traveling as a passenger in the vehicle.
Failure to heed this warning could result in severe personal injury or death.
In the event that the vehicle is not functioning properly after completing Troubleshooting Guide 1, the techni-
cian should proceed to Troubleshooting Guide 2.
If a diagnostic handset is unavailable, the technician should proceed to Troubleshooting Guide 2.
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