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Automatic Transmission System Diagnostic System Check

WARNING: This page is about a different car, the 2002 Pontiac Sunfire, 2002 Chevrolet Cavalier, 2001 Pontiac Sunfire, and 2001 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: DO NOT perform this test if a driveability concern does not exist. DO NOT turn ignition switch to LOCK position while performing this test. DO NOT clear DTCs unless diagnostic instructs to do so.
CAUTION: Search for applicable Technical Service Bulletins (TSBs) before proceeding with diagnosis.
  1. Connect scan tool to Data Link Connector (DLC). DLC is located on lower left side of 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, go to 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, diagnose and repair MIL. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  3. Attempt to establish communication with Powertrain Control Module (PCM). If scan tool communicates with PCM, go to next step. If scan tool does not communicate with PCM, go to TEST B: 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 transmission performance. Ensure that these items are not cause of a transmission concern.
  4. Using scan tool, capture INFO function in order to save or capture any Diagnostic Trouble Code (DTC) information. If any DTC exist, perform appropriate test in accordance with DTC retrieved. See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. If DTC does not exist, repair transmission concern by symptom. See appropriate OVERHAUL article in AUTOMATIC TRANSMISSIONS.
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