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Home >> GMC >> 1992 >> Forward Control 5.7 K, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Diagnosis - A/T >> Torque Converter Clutch Charts (Trucks) >> Chart C-8 Torque Converter Clutch - 3.1L Vans >> Diagnostic Aids

Diagnostic Aids

A scan tool only indicates when ECM has turned on the TCC driver, and does not confirm that 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-8 TCC Troubleshooting Chart (3.1L Vans)
G92D13725Courtesy of GENERAL MOTORS CORP.
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