IQ SYSTEM TROUBLESHOOTING
Troubleshooting
11
TROUBLESHOOTING GUIDE 2
TROUBLESHOOTING GUIDE 2
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
Batteries – Batteries discharged
Charge batteries
Batteries – Battery connections
Check vehicle wiring.
See Wiring Diagrams
on page 11-2.
Battery charger is connected to the vehicle
– Solenoid lockout feature has disabled the
vehicle
Disconnect the battery charger from the
vehicle.
Onboard computer failure
Test Procedure 2 – Onboard Computer
Solenoid Lockout Circuit on page 11-15
Key switch and throttle position sensor limit
switch circuit
Check for loose or disconnected wires at key
switch and throttle position sensor
Failed key switch
Test Procedure 8 – Key Switch and Throttle
Position Sensor Limit Switch Circuit on page
11-20
Failed throttle position sensor
Test Procedure 8 – Key Switch and Throttle
Position Sensor Limit Switch Circuit on page
11-20. See also Test Procedure 4 – Throttle
Position Sensor Voltage on page 11-16.
Forward/Reverse rocker switch
Test Procedure 23 – Forward/Reverse Rocker
Switch on page 11-32
Solenoid – loose wires
Test Procedure 3 – Solenoid Activating Coil
on page 11-15
Solenoid – failed coil
Test Procedure 3 – Solenoid Activating Coil
on page 11-15
Speed controller thermal cutback
Allow controller to cool and ensure that vehicle
is not over-loaded before returning to operation
16-pin connector at speed controller
Check for loose or disconnected wires at the
16-pin connector.
See also Test Procedure 9
– 16-Pin Connector on page 11-21.
High pedal detect
Cycle accelerator pedal
Motor stall
Cycle accelerator pedal
Motor Failure
Section 18 — Motor (Model EJ4-4001 and
EJ8-4001A)
Vehicle does not operate
Speed controller failure
Replace speed controller.
See Speed
Controller Removal on page 15-12.
TABLE CONTINUED ON NEXT PAGE
2009 Electric Precedent Maintenance and Service Manual
Page 11-11
