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Diagnostic System Check

  1. Install scan tool. If scan tool powers up, go to next step. If scan tool does not power up, perform TEST A: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS in appropriate BODY CONTROL MODULES article.
  2. Turn ignition on, engine off. Following scan tool manufacturer's instructions, attempt to establish communication with Driver Door Module (DDM) and Powertrain Control Module (PCM). If communication with DDM and PCM is established, go to next step. If communication with DDM and PCM is not established, perform TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in appropriate BODY CONTROL MODULES article.
  3. Select display DTCs function for DDM and PCM. Record all displayed DTCs and status of displayed DTCs. If DTCs are displayed, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  table. If no DTCs are displayed, diagnose by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
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