Citation II L4-151 2.5L VIN R TBI (1984)
Fig. 108 Chart C-8A 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 switch, and transmission 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 (72 km/h)
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Engine at normal operating temperature above 70°C (158°F)
-
Throttle position sensor output not changing, indicating a steady road speed.
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Transmission third gear switch closed
