F 150 2WD Pickup V8-4.6L CNG SOHC VIN 9 (1997)
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
indefinitely until the pins of the diagnostic connector are disconnected.
After the 3 second test, the CTM will pause for 1 second and then proceed to either the Input Test mode or DTC Output mode depending on the state of
the key-in-ignition input