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Cruise Control Diagnostic System Check

  1. Ensure battery condition, cold cranking amperage and reserve capacity meet specifications. Replace as necessary. Install scan tool. If scan tool powers up, go to next step. If scan tool does not power up, go to TEST A: SCAN TOOL DOES NOT POWER UP  under SYSTEM TESTS.
  2. Turn ignition on, engine off. Try to establish scan tool communication with Powertrain Control Module (PCM) and Body Control Module (BCM). If communication with PCM and BCM is established, go to next step. If communication with PCM and BCM is not established, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  3. Select display DTC function for BCM and then PCM. Record all displayed DTCs, status of displayed DTCs, and module that set DTC. If DTCs are displayed, go to next step. If no DTCs are displayed, go to CRUISE CONTROL SYSTEMS - CORVETTE article.
  4. If any DTCs are displayed beginning with "U", go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS. If no "U" type DTCs are displayed, go to next step.
  5. If DTC B0605 is displayed, go to DTC B0605: BCM INTERNAL MEMORY MALFUNCTION  under DIAGNOSTIC TESTS. If DTC B0605 is not set, go to next step.
  6. If any DTCs are displayed beginning with "P", see SELF-DIAGNOSTICS - 5.7L CORVETTE article in ENGINE PERFORMANCE.
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