ELECTRICAL SYSTEM AND TESTING
Troubleshooting
Page 11-8
2005 Precedent IQ System Electric Golf Car Maintenance and Service Manual
11
TROUBLESHOOTING GUIDE 1
The following troubleshooting guide is intended for use with an IQDM handset. For IQDM operating instruc-
tions, refer to the IQDM Owner’s Manual.
See following NOTE.
NOTE: Before troubleshooting the vehicle, check the diagnostic history from the Special Diagnostics
Menu. Note any fault codes.
TROUBLESHOOTING GUIDE 1
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
Test Menu – THROTTLE % value does
not increase as the accelerator pedal is
pressed
or
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
Test Menu – HEATSINK °C indicates
that temperature is above
85 °C (145 °F)
or
Diagnostic Menu – THERMAL
CUTBACK fault code
Over-adjusted brakes
Section 6 – Wheel Brake Assemblies in
the appropriate maintenance and service
manual
Vehicle is over-loaded
Ensure that vehicle is not over-loaded
before returning to operation
Test Menu – ARM PWM value does not
reach 100% when vehicle is at full
speed
Failed MCOR
Test Procedure 4 – MCOR Voltage on
page 11-17
Test Menu – SPEED PULSES menu
item indicates that speed pulses are
OFF when the vehicle is in motion
or
Diagnostic Menu – SPEED SENSOR
fault code
Loose or disconnected motor speed
sensor or broken wire
Repair and/or connect the three-pin
connector to the motor speed sensor
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 motor speed sensor
Test Procedure 13 – Motor Speed Sensor
on page 11-34
Test Menu – FOOT INPUT menu item
indicates that the MCOR internal limit
switch is always ON or always OFF.
Loose or disconnected two-pin connector
at the MCOR or broken wire
Repair and/or connect the two-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 8 – Key Switch and
MCOR Limit Switch Circuit on page 11-20
Test Menu – FORWARD INPUT and/or
REVERSE INPUT does not indicate the
correct reading
or
Diagnostic Menu – PROC/WIRING fault
code
Loose or disconnected Forward/Reverse
rocker switch (quick disconnect terminals)
or broken wire
Repair and/or connect the quick
disconnect terminals to the Forward/
Reverse switch
Loose or disconnected Forward/Reverse
rocker switch (three-pin connector) or
broken wire
Repair and/or connect the three-pin
connector from the Forward/Reverse
switch to the wire harness
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 Forward/Reverse rocker switch
Test Procedure 15 – Forward/Reverse
Rocker Switch on page 11-36
Troubleshooting Guide continued on next page...
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