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Diagnostic Aids

A scan tool only indicates when ECM has turned on TCC driver and does not confirm TCC has engaged. To determine if TCC is functioning properly, engine RPM should decrease when scan tool indicates TCC driver has turned on.

Fig 1: Chart C-8A, 3T40 TCC Troubleshooting Chart (2.3L N & W Bodies)
G92F14857Courtesy of GENERAL MOTORS CORP.
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