Diagnostics And Troubleshooting; Programmer Diagnostics - Curtis 1244 User Manual

8 — DIAGNOSTICS & TROUBLESHOOTING
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DIAGNOSTICS AND TROUBLESHOOTING

The 1244 controller provides diagnostics information to assist technicians in
troubleshooting drive system problems. The diagnostics information can be ob-
tained by observing the appropriate display on the 1313 handheld programmer
or 1314 PC Programming Station, the fault codes issued by the Status LED,
or the fault display driven by the controller's Fault 1 and Fault 2 outputs. Refer
to the troubleshooting chart (Table 5) for suggestions covering a wide range
of possible faults.

PROGRAMMER DIAGNOSTICS

The programmer presents complete diagnostic information in plain language.
Faults are displayed in the Diagnostics Menu (see column 2 in the trouble-
shooting chart), and the status of the controller inputs/outputs is displayed in
the Monitor Menu.
Accessing the Diagnostic History Menu provides a list of the faults that
have occurred since the diagnostic history file was last cleared. Checking (and
clearing) the diagnostic history file is recommended each time the vehicle is
brought in for maintenance.
The following 4-step process is recommended for diagnosing and trou-
bleshooting an inoperative vehicle: (1) visually inspect the vehicle for obvious
problems; (2) diagnose the problem, using the programmer; (3) test the circuitry
with the programmer; and (4) correct the problem. Repeat the last three steps
as necessary until the vehicle is operational.
Example:
A vehicle that does not operate in "forward" is brought in for repair.
step 1: Examine the vehicle and its wiring for any obvious problems, such
as broken wires or loose connections.
step 2: Connect the programmer, select the Diagnostics Menu, and read
the displayed fault information. In this example, the display shows "No
Known Faults," indicating that the controller has not detected anything
out of the norm.
step 3: Select the Test Menu, and observe the status of the inputs and out-
puts in the forward direction. In this example, the display shows that the
forward switch did not close when "forward" was selected, which means the
problem is either in the forward switch or the switch wiring.
step 4: Check or replace the forward switch and wiring and repeat the test.
If the programmer shows the forward switch closing and the vehicle now
drives normally, the problem has been corrected.
Curtis 1244 Manual,
Rev. E