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Home >> Chevrolet >> 1997 >> Venture LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Basic Engine Testing >> On-Board Diagnostic (OBD) System Check >> DLC Diagnosis Or No Scan Tool Data
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DLC Diagnosis Or No Scan Tool Data

  1. Perform On-Board diagnostic (OBD) System check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  . Turn ignition on. Using test light, probe between DLC battery feed terminal No. 16 (Orange wire) and ground terminal No. 4 or No. 5 (Black wire). If test light illuminates, go to step 3). If test light does not illuminate, go to next step.
  2. Using test light, probe between DLC battery feed terminal No. 16 (Orange wire) and ground. If test light illuminates, repair open circuit between DLC terminal No. 4 or No. 5 (Black wire) and ground. If test light does not illuminate, repair open or short to ground in DLC battery feed circuit. Recheck system. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  .
  3. Turn ignition on. Using DVOM, check voltage between DLC connector terminal No. 2 (Purple wire) and ground. If voltage does not exist, go to next step. If voltage exists, go to step 6).
  4. Turn ignition off. Disconnect PCM connector. Turn ignition on. Using DVOM, check voltage between DLC connector terminal No. 2 (Purple wire) and battery voltage. If voltage does not exist, go to next step. If voltage exists, repair short to ground between DLC connector terminal No. 2 and PCM connector C1 terminal No. 59 (Purple wire). Recheck system. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  .
  5. Check for open circuit between DLC connector terminal No. 2 and PCM connector C1 terminal No. 59 (Purple wire). If no problem was found, go to step 7). If problem was found, repair as necessary and recheck system. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  .
  6. Check for short to battery voltage between DLC connector terminal No. 2 and PCM connector C1 terminal No. 59 (Purple wire). If no problem was found, go to step 7). If problem was found, repair as necessary and recheck system. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  .
  7. Replace PCM. Program PCM. Recheck system. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  .
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