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Automatic Transmission System Diagnostic System Check

NOTE: Check for applicable service bulletins before proceeding with this test. Perform this test only if there is a driveability complaint or if you have been directed to this test from another check. Do not turn the ignition off when performing this diagnostic procedure. Do not clear the DTCs unless instructed by this test.
  1. Turn ignition off. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, to right of steering column. See Figure . Turn ignition on. If scan tool powers up, go to next step. If scan tool does not power up, go to TEST D: SCAN TOOL DOES NOT POWER UP  under SYSTEM TESTS.
    2. NOTE: Malfunction Indicator Light (MIL) may also be referred to as SERVICE ENGINE SOON light.
  2. If MIL is on, go to next step. If MIL is not on, diagnose and repair MIL. See INSTRUMENT PANELS - PARK AVENUE article.
  3. Try to establish scan tool communication with Powertrain Control Module (PCM). If communication with PCM is established, go to next step. If communication with PCM is not established, go to TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
    4. NOTE: Diagnostic Trouble Codes (DTCs), engine performance, and transmission default actions can greatly affect the transmission performance. Ensure that these items are not the cause of a transmission concern.
  4. If scan tool displays DTCs that begin with "P", perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If scan tool does not display any DTCs that begin with "P", diagnose and repair transmission by symptom. See appropriate article in AUTOMATIC TRANSMISSIONS.
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