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ELECTRICAL SYSTEM AND TESTING
Troubleshooting
2008-2011 IQ System Electric Vehicle Maintenance and Service Supplement
Page 11-15
11
Vehicle runs slowly
Speed sensor disconnected or failed
Test Procedure 13 – Motor Speed Sensor
on page 11-36
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.
Batteries discharged
Charge batteries
MCOR malfunction
Test Procedure 4 – MCOR Voltage on
page 11-19
Motor – loose wires
Inspect and tighten all wire connections at
the motor
Failed motor
Vehicle is over-loaded
Ensure that vehicle is not over-loaded
before returning to operation
Speed controller failure
Replace speed controller.
Controller Removal, Section 13,
Page 13-11.
Brakes – improperly adjusted
See Section 6 – Wheel Brake
Assemblies in the appropriate
maintenance and service manual.
Tires – under-inflated or flat tires
See Section 8 – Wheels and Tires in the
appropriate maintenance and service
manual.
Vehicle operates, but motor braking
function does not
Wiring – improperly wired
Check vehicle wiring.
Speed sensor disconnected or failed
Test Procedure 13 – Motor Speed Sensor
on page 11-36
Vehicle will run in forward, but not in
reverse or will run in reverse but not
forward
Forward/Reverse rocker switch –
improperly wired
Test Procedure 15 – Forward/Reverse
Rocker Switch on page 11-38
Motor – improperly wired
Speed controller – improperly wired or
failed speed controller FET
Check vehicle wiring.
Vehicle operates, but battery charger
does not charge batteries
Onboard computer – gray wire or fuse
Test Procedure 11 – Onboard Computer
Gray Wire and Fuse on page 11-35
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
TROUBLESHOOTING GUIDE 2
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION