Reading Self-Test Codes: Notes

During Self-Test procedures, service codes are transmitted to the Self-Test Output connector by the ECA. All service codes are 2 digit numbers which are generated 1 digit at a time. Codes are shown as voltage pulses (needle sweeps) on an analog volt/ohmmeter (VOM). If a STAR (Self Test Automatic Readout) tester is used, it will count the pulses and display them as a digital code. The STAR tester will add a 0 to single digit (separator and dynamic response) codes.

Codes are shown as sequential groups of three codes. The sequence of groups varies, depending upon which test is being performed. If a VOM is being used, careful attention to the length of the pauses is necessary in order to read the codes correctly. There will be a 2 second pause between each digit in a code. There will be a 4 second pause between each code. There is a minimum 6 second pause before and after separator and dynamic response codes.