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ELECTRICAL SYSTEM AND TESTING
Troubleshooting
Page 11-12
2008-2011 IQ System Electric Vehicle Maintenance and Service Supplement
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 discharge
the controller.
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
Removal, Section 13, Page 13-7.
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 11-23
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
Diagnostic Menu – THROTTLE FAULT 1
fault code, continued
Failed MCOR
Test Procedure 4 – MCOR Voltage on
page 11-19
Diagnostic Menu – HW FAILSAFE
(Hardware Failsafe) fault code
Armature drive FET’s (field-effect
transistors) inside speed controller have
failed
Controller Removal, Section 13,
Page 13-11.
Speed controller logic malfunction
Disconnect the batteries and discharge
the controller.
Reconnect the
batteries and see if the symptom returns.
Diagnostic Menu – MAIN WELDED
(main solenoid contacts welded) fault
code
solenoid contacts have failed closed
Removal, Section 13, Page 13-7.
Diagnostic Menu – MAIN DRIVER ON or
MAIN DRIVER OFF fault code
Speed controller logic malfunction
Disconnect the batteries and discharge
the controller.
Reconnect the
batteries and see if the symptom returns.
Failure of the FET that controls the
solenoid coil
Controller Removal, Section 13,
Page 13-11.
Diagnostic Menu – MAIN COIL FAULT
fault code
or
Diagnostic Menu – MAIN DROPOUT
fault code
Solenoid coil has failed in an open
condition
Removal, Section 13, Page 13-7.
Troubleshooting Guide continued on next page...
TROUBLESHOOTING GUIDE 1
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION