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Engine Cooling System Diagnostic System Check

  1. Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, to right of steering column. See Figure . Turn ignition switch to RUN position. If scan tool powers up, go to next step. If scan tool does not power up, see TEST G: SCAN TOOL DOES NOT POWER UP in appropriate BODY CONTROL MODULES article.
  2. Try to establish scan tool communication with Instrument Panel Cluster (IPC) and Powertrain Control Module (PCM). If communication with IPC and PCM is established, go to next step. If communication with IPC and PCM is not established, go to TEST F: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in appropriate BODY CONTROL MODULES article.
  3. Select DISPLAY DTC function for PCM. Record all displayed DTCs and status of displayed DTCs. If any DTCs are displayed, go to next step. If no DTCs are displayed, attempt to diagnose system by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
  4. If scan tool does not display any DTCs that begin with "U", go to appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If scan tool displays any DTCs that begin with "U", go to TEST F: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in appropriate BODY CONTROL MODULES article.
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