32
Curtis 1253 Manual, Rev. F
5 — DIAGNOSTICS & TROUBLESHOOTING
5
DIAGNOSTICS AND TROUBLESHOOTING
e 1253 controller provides diagnostics information to assist technicians in
troubleshooting pump system problems. e diagnostics information can be
obtained by observing the appropriate display on the handheld programmer or
the fault codes issued by the optional Status LED. Refer to the troubleshooting
chart (Table 5) for suggestions covering a wide range of possible faults.
PROGRAMMER DIAGNOSTICS
e programmer presents complete diagnostic information in plain language.
Faults are displayed in the Faults Menu (see column 2 in the troubleshooting
chart), and the status of the controller inputs/outputs is displayed in the Mon-
itor Menu.
Accessing the Fault History Menu provides a list of the faults that have
occurred since the fault history file was last cleared. Checking (and clearing)
the fault history file is recommended each time the vehicle is brought in for
maintenance.
e following 4-step process is recommended for diagnosing and trou-
bleshooting an inoperative pump system: (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 pump system is operational.
Example: A vehicle that cannot perform the operation requested by
Speed Select 2 is brought in for repair.
1: Examine the vehicle and its wiring for any obvious problems,
such as broken wires or loose connections.
2: Connect the programmer, select the Faults 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.
3: Select the Monitor Menu, and observe the status of the SS2
input. In this example, the display shows that the switch does not
close when SS2 is selected, which means the problem is either in the
SS2 switch or the switch wiring.
4: Check or replace the SS2 switch and wiring and repeat the
test. If the programmer shows the SS2 switch closing and the system
now operates normally, the problem has been corrected.
To Next Page
Loading...
