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Home >> Chevrolet >> 1994 >> Corvette Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System & ASR - BOSCH 2S Micro >> Diagnosis >> Central Control Module Diagnostics >> Entering Diagnostics (Manual Diagnostic Mode)

Entering Diagnostics (Manual Diagnostic Mode)

  1. Turn ignition off. Using a jumper wire, ground Data Link Connector (DLC) connector terminal No. 12 (CCM diagnostic enable) to No. 4 (ground). See Figure. Turn ignition on. CCM will display DTCs and module for which they apply in an automatic display sequence.
  2. To cancel automatic display sequence, press any button on DIC (this enters manual diagnostic mode). Speedometer display will be blank and trip monitor will display "1.0", indicating CCM is waiting for input from technician.
  3. Driver Information Center (DIC) buttons are used to command CCM when in diagnostic mode. See DIC DIAGNOSTIC USAGE table. Press TRIP RESET button repeatedly on Driver Information Center (DIC) until "9.0" is displayed in trip monitor area of instrument cluster. See TRIP MONITOR DISPLAY table.
  4. Trip monitor display "9.0" indicates CCM is waiting on instructions for displaying ABS/ASR information. Press TRIP ODO once on DIC. Trip monitor will display "9.1", indicating CCM is ready to display ABS/ASR DTCs.
  5. Speedometer will display "- - -", indicating start of DTC display. Press ENG MET button on DIC to display next value. If no DTCs are present, speedometer will continue to display "- - -". If DTCs are present, they will be displayed at this time on speedometer. Continue to press ENG MET button on DIC to display next value until all DTCs have been displayed for ABS/ASR system.
  6. When DTC display is complete, speedometer will display "- - -". To back-up during DTC display, press FUEL INFO button on DIC to display previous value. See ABS/ASR DIAGNOSTIC TROUBLE CODE (DTC)  table. EBTCM can only store up to 3 DTCs at a time. To exit diagnostics, turn ignition off and remove jumper wire. To clear DTCs, see CLEARING DTCS. If no DTCs are present and a problem exists with ABS/ASR system, see ABS/ASR SYMPTOM DIAGNOSIS.
DIC DIAGNOSTIC USAGE

Button Function
FUEL INFO Previous Value
GAUGES Previous Test
FUEL RESET Previous Module
ENG MET Next Value
TRIP ODO Next Test
TRIP RESET Next Module
TRIP MONITOR DISPLAY

Display Number Function
1.0 Waiting For Instructions: CCM
1.1 Display CCM DTCs
1.2 Display CCM Data
1.3 Display CCM Inputs Status
1.4 Cycle CCM Outputs
1.7 Clear CCM DTCs
4.0 Waiting For Instructions: PCM/ECM
4.1 Display PCM/ECM DTCs
4.7 Clear PCM/ECM DTCs
9.0 Waiting For Instructions: ABS/ASR
9.1 Display ABS/ASR DTCs
9.7 Clear ABS/ASR DTCs
A.0 Waiting For Instructions: DERM
A.1 Display DERM DTCs
A.7 Clear DERM DTCs