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12
Troubleshooting
EXCEL SYSTEM TROUBLESHOOTING
TROUBLESHOOTING GUIDE 1
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
Loose or disconnected six-pin connector at the
throttle position sensor or broken wire
Repair and/or connect the six-pin connector to
the throttle position 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
Test Menu – THROTTLE % value does not
increase as the accelerator pedal is pressed
or Diagnostic Menu – THROTTLE FAULT fault
code
Failed throttle position sensor
Test Procedure 4 – Throttle Position Sensor
Voltage on page 12-16
Over-adjusted brakes
Section 6 – Wheel Brake Assemblies
Test 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
Test Menu – ARM PWM value does not reach
100% when vehicle is at full speed
Failed throttle position sensor
Test Procedure 4 – Throttle Position Sensor
Voltage on page 12-16
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
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
Failed motor speed sensor
Test Procedure 21 – Motor Speed Sensor on
page 12-31
Loose or disconnected six-pin connector at the
throttle position sensor or broken wire
Repair and/or connect the six-pin connector to
the throttle position 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
Test Menu – FOOT INPUT menu item indicates
that the throttle position sensor internal limit
switch is always ON or always OFF.
Failed throttle position sensor
Test Procedure 8 – Key Switch and Throttle
Position Sensor Limit Switch Circuit on page
12-20
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
Test Menu – FORWARD INPUT and/or
REVERSE INPUT does not indicate the
correct reading
Failed Forward/Reverse rocker switch
Test Procedure 23 – Forward/Reverse Rocker
Switch on page 12-32
TABLE CONTINUED ON NEXT PAGE
Page 12-8
2009 Electric Precedent Maintenance and Service Manual