11
Troubleshooting
IQ SYSTEM TROUBLESHOOTING
TROUBLESHOOTING GUIDE 2
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
Speed sensor disconnected or failed
Test Procedure 21 – Motor Speed Sensor on
page 11-31
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
on page 11-2.
Batteries – Batteries discharged
Charge batteries
throttle position sensor malfunction
Test Procedure 4 – Throttle Position Sensor
Voltage on page 11-16
Motor – loose wires
Inspect and tighten all wire connections at the
motor.
Failed motor
Replace motor.
See Motor Removal on page
18-3.
Vehicle is over-loaded
Ensure that vehicle is not over-loaded before
returning to operation.
Speed controller failure
Replace speed controller.
See Speed
Controller Removal on page 15-12.
Brakes – improperly adjusted
Section 6 — Wheel Brake Assemblies
Vehicle runs slowly
Tires – under-inflated or flat tires
Section 8 — Wheels and Tires
Wiring – improperly wired
Check vehicle wiring.
See Wiring Diagrams
on page 11-2.
Vehicle operates, but motor braking function
does not
Speed sensor disconnected or failed
Test Procedure 21 – Motor Speed Sensor on
page 11-31
Forward/Reverse rocker switch – improperly
wired
Test Procedure 23 – Forward/Reverse Rocker
Switch on page 11-32
Motor – improperly wired
Check motor wiring.
See Wiring Diagrams
on page 11-2.
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
on page 11-2.
Onboard computer – gray wire
Test Procedure 19 – Onboard Computer Gray
Wire on page 11-30
Battery charger connections – loose wires at
receptacle or batteries
Check wire connections and tighten if
necessary.
Vehicle operates, but battery charger does not
charge batteries
Battery charger
Refer to the appropriate battery charger
maintenance and service manual.
Page 11-12
2009 Electric Precedent Maintenance and Service Manual
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