ELECTRICAL SYSTEM AND TESTING: ELECTRIC
VEHICLES
Troubleshooting
22
TROUBLESHOOTING GUIDE 1
The following troubleshooting guide is intended for use with an IQDM handset. For IQDM operating instructions, 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
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
Monitor Menu – THROTTLE % value
does not increase as the accelerator
pedal is pressed or Diagnostic Menu –
THROTTLE FAULT 1 fault code
Failed MCOR
Test Procedure 4 – MCOR Voltage on page 22-13
Over-adjusted brakes
See Wheel Brake Assemblies Section
Monitor Menu – HEATSINK °C
indicates that temperature is above
85 °C (145 °F) or Diagnostic Menu –
THERMAL CUTBACK fault code
Vehicle is over-loaded
Ensure that vehicle is not over-loaded before
returning to operation
Failed MCOR
Test Procedure 4 – MCOR Voltage on page 22-13
Monitor Menu – ARM PWM value does
not reach 100% when vehicle is at full
speed
Improper pedal group adjustment
See Accelerator and Brake Pedal Group Section
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
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
Failed motor speed sensor or failed magnet
Test Procedure 24 – Motor Speed Sensor on page
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
Monitor Menu – FOOT INPUT menu
item indicates that the MCOR internal
limit switch is always ON or always
OFF.
Failed MCOR limit switch
Test Procedure 9 – Key Switch and MCOR Limit
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
Monitor Menu – FORWARD INPUT
and/or REVERSE INPUT does
not indicate the correct reading or
Diagnostic Menu – PROC/WIRING fault
code
Failed Forward/Reverse rocker switch
Test Procedure 26 – Forward/Reverse Rocker
TABLE CONTINUED ON NEXT PAGE
2007-2009 Turf 252, Carryall 252 and XRT 900 Maintenance and Service Manual
Page 22-5
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