12
Troubleshooting
EXCEL SYSTEM TROUBLESHOOTING
TROUBLESHOOTING GUIDE 1
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
Diagnostic Menu – MAIN COIL FAULT fault
code or Diagnostic Menu – MAIN DROPOUT
(1 or 2) 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
Page 12-10
2009 Electric Precedent Maintenance and Service Manual
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