Diagnostic Aids

Check transmission pass-through connector and PCM/TCM for poor connections. TCC solenoid is pulse width modulated (frequency controlled) and will allow some slight slippage.

Fig 1: TCC Circuit Check Schematic - 1993 "C" & "K" Series

Courtesy of GENERAL MOTORS CORP.

Fig 2: TCC Circuit Check Schematic - 1993 "G" Series

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Fig 3: TCC Circuit Check Flow Chart - 1993

Courtesy of GENERAL MOTORS CORP.