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Cruise Control Diagnostic System Check

NOTE: Diagnostic check determines if PCM is capable of controlling cruise control module. If diagnostic check fails, PCM, cruise control module or linkage may be at fault.
  1. Turn ignition switch to LOCK position. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, to right of steering column. 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 F: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS in BODY CONTROL MODULES - MONTANA, SILHOUETTE & VENTURE article.
  2. Turn ignition switch to RUN position. Try to establish scan tool communication with Electronic Brake Control Module (EBCM) and Powertrain Control Module (PCM). If communication with both modules is established, go to next step. If communication with both modules is not established, go to TEST E: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in BODY CONTROL MODULES - MONTANA, SILHOUETTE & VENTURE article.
  3. If scan tool does not display any DTCs that begin with "U", go to next step. If scan tool displays any DTCs that begin with "U", go to TEST E: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in BODY CONTROL MODULES - MONTANA, SILHOUETTE & VENTURE article.
  4. Using scan tool, select ABS CONTROL MODULE DISPLAY DTCS. If scan tool does not display any Anti-Lock Brake System (ABS) DTCs, go to next step. If scan tool displays any ABS DTCs, perform appropriate test. See appropriate ANTI-LOCK article in BRAKES.
  5. Using scan tool, select PCM DISPLAY DTCS. If scan tool does not display any PCM transaxle DTCs, go to next step. If scan tool displays any PCM transaxle DTCs, perform appropriate test. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  6. If scan tool displays any cruise control system DTCs, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  table. If scan tool does not display any cruise control system DTCs, repair cruise control system by symptom. See SYMPTOM INDEX  under SYSTEM TESTS.
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