11
Troubleshooting
IQ SYSTEM TROUBLESHOOTING
TROUBLESHOOTING GUIDE 1
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
Armature drive FET’s (field-effect transistors)
inside speed controller have failed
Replace the speed controller.
See Speed
Controller Removal on page 15-12.
Diagnostic Menu – HW FAILSAFE (Hardware
Failsafe) fault code
Speed controller logic malfunction
Disconnect the batteries and allow the
speed controller capacitors to discharge.
See WARNING “To avoid unintentionally
starting...” in General Warnings on page
1-1.
Reconnect the batteries and see if the
symptom returns.
Diagnostic Menu – MAIN WELDED (main
solenoid contacts welded) fault code
solenoid contacts have failed closed
Replace solenoid.
See Solenoid Removal on
page 15-13.
Speed controller logic malfunction
Disconnect the batteries and allow the
speed controller capacitors to discharge.
See WARNING “To avoid unintentionally
starting...” in General Warnings on page
1-1.
Reconnect the batteries and see if the
symptom returns.
Diagnostic Menu – MAIN DRIVER ON or MAIN
DRIVER OFF fault code
Failure of the FET that controls the solenoid
coil
Replace the speed controller.
See Speed
Controller Removal on page 15-12.
Diagnostic Menu – MAIN COIL FAULT fault
code or Diagnostic Menu – MAIN DROPOUT
fault code
Solenoid coil has failed in an open condition
Replace solenoid.
See Solenoid Removal on
page 15-13.
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 18 — Motor (Model EJ4-4001 and
EJ8-4001A)
Diagnostic Menu – FIELD MISSING fault code
Failure of the FET’s that control field current
Replace the speed controller.
See Speed
Controller Removal on page 15-12.
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 16 — Batteries
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 18 — Motor (Model EJ4-4001 and
EJ8-4001A)
Diagnostic Menu – OPEN ARMATURE fault
code
Failure of the FET’s that control armature
current
Replace the speed controller.
See Speed
Controller Removal on page 15-12.
Page 11-10
2009 Electric Precedent Maintenance and Service Manual
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