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Scan Tool Inoperative

  1. Connect scan tool to Data Link Connector (DLC). Power up scan tool. If scan tool does not turn on, go to next step.
  2. Disconnect scan tool from DLC. Using a DVOM, measure voltage between DLC terminal No. 16 (Red wire) and ground. If battery voltage is present, go to step 4). If battery voltage is not present, go to next step.
  3. Locate and repair open or high resistance in Red wire between DLC and fuse block located behind left side of instrument panel. After repairs, go to step 6).
  4. Using a DVOM, measure resistance between DLC terminal No. 4 (Black wire) and ground. Also, measure resistance between DLC terminal No. 5 (Black wire) and ground. If resistance is less than 5 ohms for both measurements, go to step 6). If resistance is 5 ohms or more for either measurement, go to next step.
  5. Locate and repair open or high resistance in suspect Black wire between DLC and ground connection. After repairs, go to next step.
  6. If DLC power and ground circuits are okay, scan tool is malfunctioning. Ensure scan tool operates properly. If scan tool does not operate, go to step 1).
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