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Cruise Control System Diagnostic System Check

NOTE: Use this check as the starting point for any cruise control system complaint.
  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, go to TEST G: SCAN TOOL DOES NOT POWER UP in appropriate BODY CONTROL MODULES article.
  2. Turn ignition switch to RUN position. Try to establish scan tool communication with Powertrain Control Module (PCM). If communication with PCM is established, go to next step. If communication with 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 scan tool displays any cruise control DTCs, perform appropriate test. See appropriate CRUISE CONTROL SYSTEMS article. If scan tool does not display any cruise control DTCs, attempt to diagnose cruise control system by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
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