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Automatic Transmission System Diagnostic System Check

CAUTION: DO NOT perform diagnostic system check if there is not a driveability concern, unless another procedure directs you to this diagnostic procedure. Check for applicable Technical Service Bulletins (TSBs) before proceeding. Unless a diagnostic procedure instructs you, DO NOT clear DTCs. Ensure battery is fully charged before proceeding.
  1. Connect scan tool to Data Link Connector (DLC). Turn ignition on, engine off. 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  .
  2. If Maintenance Information Light (MIL) is on, go to next step. If MIL is not on, go to SELF-DIAGNOSIS - CORVETTE 5.7L article in ENGINE PERFORMANCE.
  3. Attempt to establish communication with 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  .
  4. Using scan tool, check for any DTCs stored in PCM. If any DTCs exist, go to HYDRA-MATIC 4L60-E ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS.
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