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ELECTRICAL SYSTEM TROUBLESHOOTING: IQ
PLUS ELECTRIC VEHICLES
Troubleshooting
12
TROUBLESHOOTING GUIDE 2
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
Speed sensor disconnected or failed
Test Procedure 13 – Motor Speed Sensor on page
Incorrect speed setting
To change the programmed top speed of the
vehicle, an CDT handset must be used
Wiring – improperly wired
Check vehicle wiring.
See Wiring Diagrams
beginning on page
Batteries discharged
Charge batteries
MCOR malfunction
Test Procedure 12 – MCOR Voltage on page
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 13 – Motor Speed Sensor on page
Forward/Reverse rocker switch – improperly wired
Test Procedure 8 – 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
Charger interlock failure
Test Procedure 11 – Charger Interlock on page
Battery charger connections – loose wires at
charger or batteries
Check wire connections and tighten if necessary.
Vehicle operates, but battery charger
does not charge batteries
Battery charger
Section 15 — QuiQ High Frequency Charger
2017 Carryall 500 and 700 Maintenance and Service Manual
Page 12-13
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