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Diagnostic Aids

A scan tool only indicates when ECM has turned on the TCC driver and does not confirm TCC has engaged. To determine if TCC is functioning properly, test drive vehicle. Engine RPM should decrease when Scan tool indicated TCC driver has turned on.

Fig 1: Chart C-8A, TCC Troubleshooting Chart (1992 3.8L PFI VIN 1)
G92J14836Courtesy of GENERAL MOTORS CORP.
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