Computer Control System: Description

The Toyota Computer Control System (TCCS) is a computerized emission, ignition and fuel control system. The TCCS controls Electronic Fuel Injection (EFI), engine operation and lowers exhaust emissions while maintaining good fuel economy and driveability.

The Electronic Control Unit (ECU) controls the TCCS. The ECU contains data used for maintaining ignition timing under all operating conditions. Input from various sensors allows the ECU to deliver spark at precise timing. The ECU controls engine related systems to adjust engine operation.

The TCCS is primarily an emission control system, designed to maintain proper air/fuel ratio at all operating conditions.