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Home >> Chevrolet >> 1994 >> Corvette Base, 2D Convertible, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Central Control Module & Data Link Communications >> Self-Diagnostic System >> Entering & Exiting Diagnostics >> Automatic Diagnostic Mode

Automatic Diagnostic Mode

  1. To enter automatic diagnostic mode, ground terminal No. 12 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/PCM is module No. 4, EBTCM is module No. 9 and DERM is module "A". 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/PCM 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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