ELECTRICAL SYSTEM AND TESTING: ELECTRIC
VEHICLES
Troubleshooting
22
TROUBLESHOOTING GUIDE 2
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
Speed sensor disconnected or failed
Test Procedure 24 – Motor Speed Sensor on page
Incorrect speed setting
To change the programmed top speed of the
vehicle, an IQDM-P handset must be used
Wiring – improperly wired
Check vehicle wiring.
See Wiring Diagrams
beginning on page
Batteries discharged
Charge batteries
MCOR malfunction
Test Procedure 4 – MCOR Voltage on page 22-13
Motor – loose wires
Inspect and tighten all wire connections at the
motor
Failed motor
Replace motor.
Vehicle is over-loaded
Ensure that vehicle is not over-loaded before
returning to operation
Speed controller failure
Replace speed controller.
Brakes – improperly adjusted
See Wheel Brake Assemblies Section.
Vehicle runs slowly
Tires – under-inflated or flat tires
See Wheels and Tires Section.
Wiring – improperly wired
Check vehicle wiring.
See Wiring Diagrams
beginning on page
Vehicle operates, but motor braking
function does not
Speed sensor disconnected or failed
Test Procedure 24 – Motor Speed Sensor on page
Forward/Reverse rocker switch – improperly wired
Test Procedure 26 – Forward/Reverse Rocker
Motor – improperly wired
Check motor wiring.
See Wiring Diagrams
beginning on page
Vehicle will run in forward, but not in
reverse or will run in reverse but not
forward
Speed controller – improperly wired or failed
speed controller FET
Check vehicle wiring.
See Wiring Diagrams
beginning on page
Onboard computer – gray wire or fuse
Test Procedure 22 – Onboard Computer Gray
Battery charger connections – loose wires at
receptacle or batteries
Check wire connections and tighten if necessary.
Battery charger
Refer to the appropriate battery charger
maintenance and service manual
Battery voltage below 32 volts
Charge batteries
Vehicle operates, but battery charger
does not charge batteries
Blown fuse at charger receptacle
Test Procedure 22 – Onboard Computer Gray
2007-2009 Turf 252, Carryall 252 and XRT 900 Maintenance and Service Manual
Page 22-9