Torque Converter Clutch (TCC) Solenoid

Disconnect harness connector to TCC solenoid. Measure resistance between TCC solenoid terminals "A" and "D". See Fig 1 - Fig 4 . Solenoid resistance should be greater than 20 ohms.

Fig 1: TCC, Schematic (2.5L & 2.8L)

Courtesy of GENERAL MOTORS CORP.

Fig 2: TCC, Schematic (3.1L)

Courtesy of GENERAL MOTORS CORP.

Fig 3: TCC, Schematic (3.8L)

Courtesy of GENERAL MOTORS CORP.

Fig 4: TCC, Schematic (4.3L Turbo PFI)

Courtesy of GENERAL MOTORS CORP.

Fig 5: TCC, Schematic (4.3L & V8 W/O 4L80-E Trans.)

Courtesy of GENERAL MOTORS CORP.

NOTE: Some solenoids have an internal pressure switch in series with the solenoid winding and will not show continuity until transmission hydraulic pressure is applied.