ELECTRICAL SYSTEM AND TESTING
Troubleshooting
2008-2011 IQ Plus Electric Vehicle Maintenance and Service Supplement
Page 11-9
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
Monitor 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 24-pin connector
at speed controller or broken wire
Repair and/or connect the 24-pin
connector to the speed controller
Failed MCOR
Test Procedure 4 – MCOR Voltage on
page 11-18
Monitor 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
Monitor Menu – ARM PWM value does
not reach 100% when vehicle is at full
speed
Failed MCOR
Test Procedure 4 – MCOR Voltage on
page 11-18
Improper pedal group adjustment
Section 5 – Accelerator and Brake Pedal
Group in the appropriate maintenance and
service manual
Monitor 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 24-pin connector
at speed controller or broken wire
Repair and/or connect the 24-pin
connector to the speed controller
Failed motor speed sensor or failed
magnet
Test Procedure 14 – Motor Speed Sensor
on page 11-38
Monitor 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 24-pin connector
at speed controller or broken wire
Repair and/or connect the 24-pin
connector to the speed controller
Failed MCOR limit switch
Test Procedure 9 – Key Switch and
MCOR Limit Switch Circuit on page 11-23
Monitor 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 24-pin connector
at speed controller or broken wire
Repair and/or connect the 24-pin
connector to the speed controller
Failed Forward/Reverse rocker switch
Test Procedure 16 – Forward/Reverse
Rocker Switch on page 11-41
Troubleshooting Guide continued on next page...
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