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Home >> Chevrolet >> 1993 >> Corvette Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Central Control Module & Data Link Communication System >> Self-Diagnostic System >> Entering & Exiting Diagnostics >> Automatic Diagnostic Mode
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Automatic Diagnostic Mode

Diagnostic system cannot display ECM trouble codes on speedometer for VIN J engine, and will display "Err" when attempting to display ECM codes for VIN J engine. DTC display and clearing DTCs for VIN J engine is only accessible with a scan tool, such as the Tech 1.

  1. To enter automatic diagnostic mode, ground terminal G of Data Link Connector (DLC). See Figure . Turn ignition switch to ON position. CCM will display codes and module associated with code in an automatic code display sequence. CCM is module No. 1, ECM is module No. 4 and EBTCM is module No. 9. See Figure .
  2. During automatic display sequence each code is displayed for 3 seconds followed by a one second pause before displaying next code. A 3 second pause separates code display for each module. After each module code display, "--" will display on speedometer indicating end of display. If a communication problem exists between CCM and ECM or CCM and EBTCM, speedometer will display "Err".
  3. After all codes are displayed for all modules, trip monitor will display "1.0" and speedometer will be blank. CCM has now entered manual diagnostic mode.
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