Wheel System, Traction 188Service Manual – SC6500
™
Troubleshooting
If there is a problem with the wheel drive system, begin by checking for any fault codes. If there is a fault
code, diagnose the cause of the code. If there are no fault codes, check the wheel drive controller status LED
for clues and use the shop measurements in the specifications section to systematically check the voltage
at every low current connector wire looking for something abnormal. And remember that the system is
intentionally disabled if the interlock circuit (seat switch and battery interlock switch) is open.
Fault Codes
The drive controller has very robust fault code capabilities. When the wheel drive controller sets a fault, it
communicates the fault to the “main” control board. The main control board displays an error 03 message
on the LCD display and ashes out the specic wheel drive controller fault code using the control panel
detergent switch LED.
Since most problems will result in setting a fault code, whenever there is a problem with the drive system,
the rst thing you should do is check for fault codes. Fault codes can be obtained by counting the ash out
code of the detergent LED, counting the ash code of the Status LED on the wheel drive controller or by
using a Curtis hand-held programmer.
1. Counting the detergent LED ash code
a. The codes consist of two digits. The LED ashes the rst digit, followed by a short pause, then
ashes the second digit followed by a long pause before ashing out the next code. All active codes
will continue to ash out. You count each “on” ash of the LED. The key is to watch until you get the
rhythm and can identify the long pause. Start counting immediately after the long pause. Example:
00 000 00 000 is a code 23 that has repeated.
2. Counting the wheel drive controller status LED ash code
a. A single Status LED on the wheel drive controller is used to ash out all currently active codes.
The Status LED illuminates either red or yellow color light. Each code consists of two digits. The
“Main” controller
fault code 03 =
“There is a wheel
drive controller fault
code”
Flashes out wheel drive
controller fault code
Figure 10: Status LED
Status LED
(rst digit) (2) (second digit)
(3)
Figure 11: Example: Fault Code 23
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