Reading Fault Codes

The first item on the menu the EVO control module will output to the Star Tester is DTC 21. This represents asking the service technician whether they would like to "Read fault codes?" stored in memory. If the service technician releases the HOLD/TEST button for one second, then latches the HOLD/TEST down again within eight seconds after receiving DTC 21, the EVO control module will enter this test output the fault DTCs stored in memory and complete this test by outputting DTC 22 to the Star Tester which signals end of test.