2000 Sunbird L4-121 2.0L VIN B 2-bbl (1984)
Fig. 106 Chart C-8 Transmission Converter Clutch
The purpose of the automatic transmission torque converter clutch feature is to eliminate the power loss of the torque converter stage when the vehicle
is in a cruise condition. This allows the convenience of the automatic transmission and the fuel economy of a manual transmission.
Fused battery ignition is supplied to the TCC solenoid through the brake and third gear apply switch.
The ECM will engage TCC by grounding CKT 422 to energize the solenoid.
TCC will engage when:
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Vehicle speed above 45 mph.
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Engine at normal operating temperature (above 70°C).
