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Home >> Chevrolet >> 1999 >> Metro Base, 2D Hatchback >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Circuit Tests >> Data Link Connector Diagnosis >> Diagnosis & Repair
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Diagnosis & Repair

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. If scan tool displays engine data, system is okay. If scan tool does not display engine data, go to next step.
  3. Turn ignition on, with engine off. Using DVOM, measure voltage between DLC power supply circuit and ground. See WIRING DIAGRAMS article. If battery voltage is present, go to next step. If battery voltage is not present, go to step  6 .
  4. Using DVOM, measure voltage between DLC serial data output circuit and ground. See WIRING DIAGRAMS article. If battery voltage is present, go to next step. If battery voltage is not present, go to step  7 .
  5. Using test light connected to battery voltage, probe DLC ground circuits. See WIRING DIAGRAMS article. If test light illuminates on both circuits, go to step  10 . If test light does not illuminate on either circuit, go to step  8 .
  6. Repair open or short in DLC power supply circuit. After repairs, go to step  11 .
  7. Repair open or short in DLC serial data output circuit. After repairs, go to step  11 . If circuit is okay, go to step  9 .
  8. Repair open(s) in DLC ground circuit(s). After repairs, go to step  11 .
  9. Replace PCM. Program PCM using required equipment. After replacing PCM, go to step  11 .
  10. Scan tool is faulty. Refer to scan tool manual for repairs. After repairs, go to next step.
  11. After repairs are completed, operate vehicle within conditions under which original symptom was observed. If system operates properly, repair is complete. If system does not operate properly, go to DIAGNOSTIC AIDS  .
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