Transmission Controlled Spark: Description
NOTE:
The Transmission Controlled Spark (TCS) system has been combined with the Spark Control System on 1977 models. See TOYOTA SPARK CONTROL/DELAY SYSTEMS article in this section.
The Transmission Controlled Spark (TCS) system controls vacuum ignition timing in accordance with coolant temperature, vehicle speed, and catalytic converter temperature (4M engine only). System typically consists of speed sensor, computer, temperature sensor, vacuum switching valve, and vacuum unit on distributor.