Vestil EPT-30 - Manual (Page 45)

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Curtis PMC 1207/1207A Manual 38
5 — DIAGNOSTICS & TROUBLESHOOTING
Operational faults—such as overtemperature—are cleared as soon as operation is
brought within range. Non-operational faults—such as a throttle fault—usually
require the brake or keyswitch to be cycled after the problem is remedied.
PROGRAMMER DIAGNOSTICS
With a programmer, diagnostics and troubleshooting is more direct than with the
LED alone. The programmer presents complete diagnostic information in plain
language—no codes to decipher. Faults are displayed in the Diagnostic Menu,
and the status of the controller inputs/outputs is displayed in the Test Menu.
The following 4-step process is generally used for diagnosing and troubleshooting
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, put it in diagnostic mode,
and read the displayed fault information. In this example, the
display shows “No Faults Present,” indicating that the control-
ler has not detected anything out of the norm.
STEP 3: Put the programmer in test mode, and observe the
status of the inputs and outputs 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.
Refer to the troubleshooting chart (Table 2) for suggestions covering a wide range
of possible faults.