ELECTRICAL SYSTEM TROUBLESHOOTING: IQ
PLUS ELECTRIC VEHICLES
Troubleshooting
12
TROUBLESHOOTING GUIDE 1
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
Loose or disconnected motor field coil
wires at motor or speed controller or
broken wire
Repair and/or connect the field coil wires
Failure of the motor field windings
Section 16 — Motor (Model DA5-4006): Electric Vehicles
Diagnostic Menu – FIELD MISSING
fault code
Failure of the FET’s that control field
current
Replace the speed controller.
Diagnostic Menu – HPD (high pedal
detect) fault code
Operator error
Train operators to fully remove foot from accelerator pedal
before turning key switch to the ON position or changing
the selected direction with the Forward/Reverse switch
Batteries require charging
Place batteries on battery charger and allow them to fully
charge
Diagnostic Menu – LOW BATTERY
fault code
Improperly maintained or failed batteries
Section 14 — Batteries: IQ Plus Electric Vehicles
Diagnostic Menu – MOTOR STALL
fault code
Operator error
Train operators to use the brake to hold the vehicle on
a hill, rather than holding the vehicle on a hill using the
accelerator pedal.
Loose or disconnected motor armature
wires at motor or speed controller or
broken wire
Repair and/or connect the motor armature wires
Failure of the motor armature or brushes
Section 16 — Motor (Model DA5-4006): Electric Vehicles
Diagnostic Menu – OPEN ARMATURE
fault code
Failure of the FET’s that control armature
current
Replace the speed controller.
2017 Carryall 500 and 700 Maintenance and Service Manual
Page 12-11
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