DeVille V8-252 4.1L VIN 8 FI (1983)
FIGURE 3 - Converter Clutch Applied (THM 200-4R Shown - THM 325-4L Typical)
C.
Converter Clutch in Applied Position (refer to Figure 3) - When enable conditions are met the ECM grounds circuit 422 and energizes the
TCC solenoid. With the solenoid energized signal off is not allowed to exhaust and overcomes the converter clutch apply valve spring,
shifting the valve and changing the direction of the converter feed off. The converter clutch apply valve will now send converter feed oil into
the apply passage. The apply off will charge the converter with oil and force the converter clutch pressure plate against the converter cover,
causing a mechanical link between the engine and transmission. At the same time the converter clutch apply valve will direct some converter
feed off through an orifice to the transmission cooler in the radiator. Oil returning from the cooler, is then directed to the transmission
lubrication system.
On early 1982 Cadillacs, a converter clutch shift valve and converter clutch TV valve were also in the control valve assembly. These valves
were designed to control the speed at which the TCC would apply. Since TCC apply speed is controlled by the ECM on Cadillacs equipped
with HT4100 engines, the converter clutch shift valve and converter clutch TV valve were no longer necessary and, therefore, eliminated. For
further information regarding the elimination of these valves, refer to Serviceman Bulletin 84-25, Group 7, No. 91.