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Cruise Control Diagnostic System Check

  1. Following manufacturer's instructions, install GM Tech II scan tool to Data Link Connector (DLC). If scan tool powers up, go to next step. If scan tool does not power up, go to appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  2. Turn ignition switch to ON position. Following scan tool manufacturer's instructions, attempt to establish communications with PCM. If communications can be established, go to next step. If communications with PCM cannot be established, go to appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  3. Select powertrain control module display function on scan tool. If any DTCs starting with "P" are displayed, go to appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure all engine performance DTCs are corrected before proceeding. If no DTCs are displayed, go to SYSTEM OPERATION CHECK  under TROUBLE SHOOTING.
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