F 250 4WD LD Pickup V8-5.4L SOHC VIN L (1997)
The diagnostic test mode is entered by shorting together the pins of the diagnostic connector, located behind the right side kick panel. The CTM returns
to the normal mode when the pins of the diagnostic connector are no longer connected.
The diagnostic test mode is made up of the following:
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Tone and Door Ajar Indicator Test mode.
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Diagnostic Trouble Code (DTC) output mode.
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Input Test mode.
The Tone and Door Ajar Indicator Test mode is run immediately upon entry into the diagnostic test mode. When this is complete, the key-in-ignition
input is then used to switch between the Input Test mode and the DTC Output mode. When the key is not in the ignition switch, the DTC Output mode
will be active. When the key is in the ignition switch, the Input Test will be active. The Input Test mode and DTC Output mode can be switched between
indefinitely until the pins of the diagnostic connector are disconnected.
After the three second test, the CTM will pause for one second and then proceed to either the Input Test mode or DTC Output mode depending on the
state of the key-in-ignition input.
Diagnostic Trouble Code (DTC) Output Mode
When the CTM is in the normal mode of operation it is continually monitoring itself. When a concern occurs that the CTM can recognize, it is recorded.
The DTC Output mode outputs DTCs by sounding the chime. This mode is entered from the input test mode when the key is removed from the ignition