Diagnostic Trouble Codes (DTC)

Diagnostic Trouble Codes

The EEC-IV system communicates service information through the Self-Test diagnostic trouble codes (DTC). These DTC's are two-digit numbers representing the results of the Self-Test.

Self-Test Output Code Format




The DTC's are transmitted on the Self-Test output (STO) (found in the data link connector) in the form of timed pulses, and read by the technician on a voltmeter or on the SUPER STAR II Tester.