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Engine Cooling System Diagnostic System Check

  1. Connect scan tool to Data Link Connector (DLC). DLC is located on lower left side of instrument panel, near steering column. If scan tool powers up, go to next step. If scan tool does not power up, go to TEST A: SCAN TOOL DOES NOT POWER UP  under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. 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 TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  3. Select DISPLAY DTCs function for PCM on scan tool. If any DTCs are retrieved, go to next step. If no DTCs are retrieved, diagnose and repair cooling fan by symptom. See appropriate ELECTRIC COOLING FANS article in ENGINES.
  4. If communication DTCs (DTCs beginning with a "U") are not retrieved, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If any DTCs beginning with "U" are retrieved, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
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