Troubleshooting - Motor Controller
3A6623C
19
Troubleshooting - Motor Controller
Diagnostics
Diagnostics information can be obtained by observing
the fault codes issued by the Status LEDs. See Table 1
for a summary of LED display formats.
The pair of LEDs built into the controller (one red, one
yellow) produce flash codes displaying all the currently
set faults in a repeating cycle. Each code consists of two
digits. The red LED flashes once to indicate that the first
digit of the code will follow: the yellow LED then flashes
the appropriate number of times for the first digit. The
red LED flashed twice to indicate that the second digit of
the code will follow; the yellow LED flashes the appropri-
ate number of times for the second digit.
Example:
B+ Undervoltage Cutback (code 23) and Stall Detected
(code 73).
The controller’s two LEDs will display this repeating pat-
tern:
The numerical codes used by the yellow LED are listed
in
, page 20, which also lists possible fault
causes and describes the conditions that set and clear
each fault.
NOTE: If there are more than one errors active at one
time, the control will cycle through them and repeat.
Summary of LED Display Formats
The two LEDs have four different display modes, indi-
cating the type of information they are providing.
Table 1
Code
Display
23
One red, two yellow, two red, three yellow
73
One red, seven yellow, two red, three yellow
Display
Status
Neither LED illumi-
nated
Controller is not powered on, or
Vehicle has dead battery, or
Severe damage
Yellow LED flash-
ing
Controller is operating normally
Yellow and red
LEDs both on solid
Controller is in Flash program mode
Red LED on solid
Internal hardware fault detected by the
Supervisor or Primary microprocessor.
Missing or corrupt software. Interrupting
a software download may cause corrup-
tion of the software. Cycle power switch
to clear. Reload software or replace con-
troller if necessary.
Red LED and yel-
low LED flashing
alternately
Controller has detected a fault. 2-digit
code flashed by yellow LED identifies
the specific fault; one or two flashes by
red LED indicate whether first or second
code digit will follow.
