Service Code Format
Service Code FormatSERVICE CODES
The ISC-E system communicates service information through the Self-Test service codes.
These service codes are two~digit numbers representing the results of Self Test.
The service codes are transmitted on the Self-Test output (found in the Self-Test connector) in the form of timed pulses, and read by the technician on voltmeter or on the STAR tester.
The pulse format is shown below:
- One-half second on-time for each digit.
- Two seconds off-time between digits.
- Four seconds off-time between codes.
- 8 to 12 seconds before fast and service codes.
SELF-TEST OUTPUT CODE FORMAT ENGINE RUNNING
