ELECTRICAL SYSTEM AND TESTING
Troubleshooting
2005 Precedent IQ System Electric Golf Car Maintenance and Service Manual
Page 11-9
11
Test Menu – MAIN CONT (solenoid)
does not indicate ON when the
solenoid should be activated.
or
Diagnostic Menu – MAIN CONT DNC
(main contactor (solenoid) did not
close) 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, Section 1, Page 1-2.
Reconnect the batteries and see if the
symptom returns.
Loose, broken, or disconnected wire(s) at
solenoid or B+ speed controller terminal
Repair and/or connect the loose or
disconnected wire(s)
Loose or disconnected 16-pin connector
at speed controller or broken wire
Repair and/or connect the 16-pin
connector to the speed controller
Failed solenoid
Replace solenoid.
See Solenoid
Removal, Section 12, Page 12-12.
Test Menu – KEY INPUT does not
indicate ON when key switch is in the
ON position
Loose or disconnected wires at key switch
terminals or broken wire
Repair and/or connect the quick
disconnect terminals to the Forward/
Reverse switch
Loose or disconnected 16-pin connector
at speed controller or broken wire
Repair and/or connect the 16-pin
connector to the speed controller
Failed key switch
Test Procedure 8 – Key Switch and
MCOR Limit Switch Circuit on page 11-20
Diagnostic Menu – THROTTLE FAULT 1
fault code
Loose or disconnected three-pin
connector at the MCOR or broken wire
Repair and/or connect the three-pin
connector to the MCOR
Loose or disconnected 16-pin connector
at speed controller or broken wire
Repair and/or connect the 16-pin
connector to the speed controller
Failed MCOR
Test Procedure 4 – MCOR Voltage on
page 11-17
Diagnostic Menu – HW FAILSAFE
(Hardware Failsafe) fault code
Armature drive FET’s (field-effect
transistors) inside speed controller have
failed
Replace the speed controller.
See Speed
Controller Removal, Section 12,
Page 12-11.
Speed controller logic malfunction
Disconnect the batteries and allow the
speed controller capacitors to discharge.
See WARNING “To avoid
unintentionally starting...” in General
Warnings, Section 1, Page 1-2.
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, Section 12, Page 12-12.
Diagnostic Menu – MAIN DRIVER ON or
MAIN DRIVER OFF 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, Section 1, Page 1-2.
Reconnect the batteries and see if the
symptom returns.
Failure of the FET that controls the
solenoid coil
Replace the speed controller.
See Speed
Controller Removal, Section 12,
Page 12-11.
Troubleshooting Guide continued on next page...
TROUBLESHOOTING GUIDE 1
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION