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Engine Cooling Diagnostic System Check

  1. Connect scan tool to DLC located under 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 on. Attempt to establish communication with instrument cluster and Powertrain Control Module (PCM). If scan tool communicates with all modules, go to next step. If scan tool does not communicate with all modules, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  3. Select powertrain control module display DTCs function for each module. Record displayed DTCs. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair engine cooling system by symptom. See ELECTRONIC COOLING FANS - CARS article in ENGINES.
  4. Check for communication DTCs. These DTCs will begin with "U". If no "U" DTCs exist, diagnose by symptom. See ELECTRONIC COOLING FANS - CARS article in ENGINES. If any "U" DTC exists, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
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