IQ SYSTEM TROUBLESHOOTING
Troubleshooting
11
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 – 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
11-20
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 or Diagnostic Menu –
PROC/WIRING fault code
Failed Forward/Reverse rocker switch
Test Procedure 23 – Forward/Reverse Rocker
Switch on page 11-32
Speed controller logic malfunction
Disconnect the batteries and allow the
speed controller capacitors to discharge.
See WARNING “To avoid unintentionally
starting...” in General Warnings on page
1-1.
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
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
Failed solenoid
Replace solenoid.
See Solenoid Removal on
page 15-13.
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
Test Menu – KEY INPUT does not indicate ON
when key switch is in the ON position
Failed key switch
Test Procedure 8 – Key Switch and Throttle
Position Sensor Limit Switch Circuit on page
11-20
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
Diagnostic Menu – THROTTLE FAULT 1 fault
code
Failed throttle position sensor
Test Procedure 4 – Throttle Position Sensor
Voltage on page 11-16
TABLE CONTINUED ON NEXT PAGE
2009 Electric Precedent Maintenance and Service Manual
Page 11-9