Chart C-8A, Torque Converter Clutch Functional Check - 1992 3.8L PFI (VIN L & 1): Notes

Fig 1: Chart C-8A, TCC Functional Check Circuit (VIN L) 1992 3.8L PFI)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Chart C-8A, TCC Functional Check Circuit (VIN 1) 1992 3.8L PFI)

Courtesy of GENERAL MOTORS CORP.

When solenoid coil is activated, TCC is applied which results in a straight through mechanical coupling from engine to wheels. When solenoid coil is deactivated, TCC is released which allows torque converter to operate in conventional manner. PWN solenoid varies hydraulic pressure to make locking and unlocking of TCC smoother. TCC will engage under the following conditions:

Engine is warmed up.
Vehicle speed above a calibrated value of about 28 MPH.
Throttle position not changing, indicating a steady speed.
Brake switch is closed.
NOTE: Test numbers refer to test numbers on diagnostic chart.
1. This test ensures transmission test box J-38791 is working properly, ignition power is being supplied to transmission solenoids and circuits No. 422, 584 and 1350 are not grounded.
2. This test ensures PCM can control TCC apply solenoid circuit No. 422 properly.
3. This test ensures PCM can control TCC apply solenoid circuit No. 584 and 1350.
4. DO NOT measure resistance until ignition has been off for at least 10 seconds to ensure PCM has powered down completely.