IQ DISPLAY MODULE (IQDM) SERIES 2 AND IQDM-P DIAGNOSTICS
Faults Menu
2008-2011 IQ Plus Electric Vehicle Maintenance and Service Supplement
Page 12-11
12
FAULT DESCRIPTIONS
The following faults can be detected by the IQ Plus controller:
01 Throttle Fault 1
If the MCOR (Motor Controller Output Regulator) voltage is less than 0.20 volts or greater than 4.80 volts, the
controller detects a
throttle fault
.
02 Low Battery Voltage
If the battery voltage falls below 34 volts ±5%, the
low battery voltage
fault is detected by the speed controller.
03 Overvoltage
If the speed controller detects that the battery voltage is too high (72 volts ±5%), the
overvoltage
fault is
detected.
04 Thermal Cutback
If the controller heatsink temperature is found to be in excess of 85 °C ±5 °C (185 °F ±9 °F) or below –25 °C
±5 °C (–13 °F ±9 °F), the
thermal cutback
fault is detected.
06 HPD
The
HPD
(High Pedal Detect) fault is detected if the accelerator pedal is already depressed when the key
switch is turned to the ON position. This fault, when not caused by the operator, can indicate that the pedal
limit switch has failed closed.
07 Main Welded
If the speed controller detects that the solenoid contacts are welded closed, a
main welded
fault is detected.
08 Relay Welded
If the speed controller detects that the external Walk Away relay contacts are welded closed, a
relay welded
fault is detected.
09 Speed Sensor
If the speed controller does not detect pulses from the speed sensor while the controller outputs power
(greater than 75% armature PWM) to the motor, a
speed sensor
fault is detected.
10 Main Driver On
If the FET that controls the activation of the solenoid coil is found to be energized when it should not be, a
main driver on
fault is detected by the speed controller.
11 Main Coil Open
If the Main Contactor Coil develops an open circuit or is disconnected from the controller , a
main coil open
fault is detected. Walk Away is not affected by this fault.
12 Main Dropout
If the controller detects that the solenoid contacts have opened while the vehicle is in operation, a
main drop-
out
fault is detected.
13 Motor Stall
If the motor current is high and there is no movement of the vehicle wheels for a short period of time, a
motor
stall
is detected by the speed controller. This fault can be caused by an operator holding the vehicle on a hill
by depressing the accelerator pedal instead of the brake pedal.
