1.9L Engine Control System: Description

All California S-10 and S-15 trucks equipped with the 1.9L engine utilize the Closed Loop Emission Control system. It is an electronically controlled system which monitors various engine/vehicle functions to control engine operation and lower exhaust emissions while maintaining good fuel economy and driveability.

The Electronic Control Module (ECM) is the "brain" of this system. The ECM controls engine-related systems, constantly adjusting engine operation to maintain good vehicle performance under normal driving conditions.