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Test M: Engine Coolant Temperature Gauge Inaccurate Or Inoperative

  1. If Instrument Panel Cluster (IPC) system diagnostic system check has been performed, go to next step. If IPC system diagnostic system check has not been performed, perform IPC system diagnostic system check. See INSTRUMENT PANEL CLUSTER SYSTEM DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. 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. Using scan tool, perform COOLANT GAUGE SWEEP parameter in IPC OUTPUT CONTROLS. If Engine Coolant Temperature (ECT) gauge does not move up and down when commanded, go to next step. If ECT gauge moves up and down when commanded, go to DIAGNOSING INTERMITTENTS  .
  3. Replace IPC. See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. After repair, go to next step.
  4. Operate system to verify repair. If system does not operate properly, go to step  2 . If system operates properly, system is okay.
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