Selecting Test

Selection of the "DATA?", "INPUTS?", "OUTPUTS?" or "OVERRIDE?" test types will result in the first available test being displayed. If dashes ever appear, this test is not allowed under the current operating conditions. Four characters of the display will contain a test code to identify the selection. The first two characters are letters which identify the system and test type (i.e. PD for PCM DATA) and the last two characters numerically identify the test (i.e. ED01 for Throttle Position). While selecting a specific test, any of the following actions may be taken to control the display.

1. Depressing the "OFF" button on the ECC panel will stop the test selection process and return the display to the next available test type for the selected system.
2. Depressing the "LO" button on the ECC panel will display the next smaller test number for the selected test type. If this button is pressed with the lowest test number displayed, the highest test number will then appear.
3. Depressing the "HI" button on the ECC panel will display the next larger test number for the selected test type. If this button is pressed with the highest test number displayed, the lowest test number will then appear.