Without Scan Tool

READING DIAGNOSTIC TROUBLE CODES WITHOUT A SCAN TOOL

A Tech II or equivalent Scan tool must be used to read Diagnostic Trouble Codes (DTCs) from the PCM memory. When reading DTCs, follow the instructions supplied by the Scan tool manufacturer.

Many PCM DTCs have complex test and failure conditions. Therefore, simply clearing DTCs and watching to see if the DTC sets again may not indicate whether a problem has been corrected. To verify a repair after a repair is complete, you must look up the test conditions and duplicate those conditions. If the DTC runs and passes, chances are good that the problem is fixed.