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Cooling System Diagnostic System Check

  1. Connect scan tool to Data Link Connector (DLC). See Figure . If scan tool powers up, go to next step. If scan tool does not power up, go to SCAN TOOL DOES NOT POWER UP under SELF-DIAGNOSTIC TESTS in BODY CONTROL MODULES - SEVILLE article.
  2. Turn ignition on. Attempt to establish communication with Powertrain Control Module (PCM). If scan tool communicates with PCM, go to next step. If scan tool does not communicate with PCM, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SELF-DIAGNOSTIC TESTS in BODY CONTROL MODULES - SEVILLE article.
  3. Display PCM DTCs. If any PCM DTCs are set, go to appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If no PCM DTCs are set, attempt to diagnose by symptom. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
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