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Automatic Transmission System Diagnostic System Check

NOTE: Check for any applicable technical service bulletins before performing this procedure. Perform this procedure only if there is a driveability complaint or if directed here from another procedure. DO NOT turn ignition switch to LOCK position unless directed to do so. DO NOT clear DTCs unless directed to do so.
  1. Connect scan tool to Data Link Connector (DLC). DLC is located under instrument panel, near steering column. Turn ignition switch to RUN position. 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.
  2. If Malfunction Indicator Light (MIL) is illuminated, go to next step. If MIL is not illuminated, repair MIL as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  3. Using scan tool, attempt to establish communication with Powertrain Control Module (PCM). If communication is established with PCM, go to next step. If communication is not established with PCM, perform TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  4. Using scan tool, select SCAN TOOL CAPTURE INFO function. If any DTCs are displayed, perform appropriate test in accordance with DTCs retrieved. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE or appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS. If no DTCs are displayed, repair transmission by symptom. See appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS.
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