14
Faults Menu
IQ DISPLAY MODULE (IQDM) AND IQDM-P
DIAGNOSTICS: EXCEL SYSTEM
Fault Recovery
When a fault is detected by the speed controller, the speed controller will attempt to recover from the fault and resume
normal operation. In the case of an intermittent problem such as a loose wiring connection, the controller
may
be able
to recover and operate normally for a while, but the problem should be repaired before placing the vehicle in service.
Depending on the type of fault, the controller will attempt to recover immediately after the condition clears or after the
accelerator pedal has been cycled (released and pressed again).
CONTROLLER FAULT
CONTROLLER ATTEMPTS TO
RECOVER
HW FAILSAFE
When key switch is cycled
THROTTLE FAULT
When condition clears
SPEED SENSOR
When condition clears
MAIN WELDED
When condition clears
MAIN DRIVER ON
When condition clears
MAIN DRIVER OFF
When accel. pedal is cycled
MAIN COIL OPEN
When accel. pedal is cycled
FIELD MISSING
When accel. pedal is cycled
HPD
When accel. pedal is cycled
OVERVOLTAGE
When condition clears
LOW BATTERY VOLTAGE
When condition clears
THERMAL CUTBACK
When condition clears
MOTOR STALL
When condition clears
MAIN DROPOUT (1 and 2)
When accel. pedal is cycled
MAX PASSWORD TRIES
When Tow/Run switch is cycled
INCORRECT PASSWORD
When Tow/Run switch is cycled
BLD OVERCURRENT
Not applicable at this time
MAIN DRIVER OVERCURRENT
When condition clears
CURRENT SENSE FAULT
Within controller
M– SHORTED
When key switch is cycled
The following faults can be detected by the Excel System controller:
HW FAILSAFE
The armature drive FET’s (field effect transistors) regulate the armature current. If the speed controller detects a failure
of the armature drive FET’s or circuitry, a
hardware failsafe
fault is detected.
THROTTLE FAULT
If the throttle position sensor voltage is less than 0.20 volts or greater than 4.80 volts, the controller detects a
throttle fault
.
Page 14-10
2009 Electric Precedent Maintenance and Service Manual
