MACHINE TROUBLESHOOTING-
CONTROLLER
FAULT
CODES
86037660 CHARIOT 05/27/08
4-32
PROPEL CIRCUIT BOARD TROUBLESHOOTING
Curtis 1228 LED DIAGNOSTICS- Basic and Cylindrical
During normal operation, with no faults present, the status LED is steadily on.
If the controller detects a fault, the status LED provides two types of information.
First, it displays a slow flash (2 Hz) or a fast flash (4 Hz) to indicate the
severity of the fault. Slow-flash faults are self-clearing; as soon as the fault is
corrected, the vehicle will operate normally. Fast-flash faults (“.” in Table 2) are
considered to be more serious in nature and require that the key switch be cycled
to resume operation after the fault is corrected.
After the severity indication has been active for 10 seconds, the status
LED flashes a 2-digit fault identification code continuously until the fault is
corrected. For example, code “1,4”—low battery voltage—appears as: one LED flash, followed by a pause,
then 4 LED flashes, and then repeats.
LED
CODE
PROGRAMMER LCD
DISPLAY
EXPLANATION POSSIBLE
CAUSE
1,1
THERMAL CUTBACK
over-/under-temperature
cutback
1. Temperature >92°C or < -
25°C.
2. Excessive load on vehicle.
3. Operation in extreme
environments.
4. Electromagnetic brake not
releasing.
1,2
THROTTLE FAULT 1
throttle fault
1. Throttle input wire open or
shorted.
2. Throttle pot defective.
3. Wrong throttle type selected.
1,3
SPD LIMIT POT FAULT
speed limit pot fault
1. Speed limit pot wire(s) broken
or shorted.
2. Broken speed limit pot.
1,4
LOW BATTERY VOLTAGE
battery voltage too low
1. Battery voltage <17 volts.
2. Bad connection at battery or
controller.
1,5
OVERVOLTAGE
battery voltage too high
1. Battery voltage >36 volts.
2. Vehicle operating with charger
attached.
3. Intermittent battery
connection.
2,1
MAIN OFF FAULT
main contactor driver Off
fault
1. Main contactor driver failed
open.
2,3
MAIN CONT FLTS
main contactor fault
1. Main contactor welded or
stuck open.
2. Main contactor driver fault.
3. Brake coil resistance too high.
2,4
MAIN ON FAULT
main contactor driver On
fault
1. Main contactor driver failed
closed.
