Computerized Engine Controls: Notes

Models with 4-cylinder engines use a Bosch LH-Jetronic multipoint fuel injection system with EZ116K electronic ignition system or Regina (Bendix) multipoint fuel injection system with Rex-1 electronic ignition system. Both systems have self-diagnostic capabilities.

All 5-cylinder models use a Bosch LH3.2 multipoint fuel injection system with EZ129K electronic ignition system with knock sensor. Both systems have self-diagnostic capabilities.

All 6-cylinder models use a Motronic 1.8 injection and electronic ignition system. System has complete self-diagnostic capabilities.

All systems use an Electronic Control Unit (ECU) that receives input from engine monitoring sensors. These sensors include camshaft sensor (EZ129K and Motronic), coolant temperature sensor, air temperature sensor (Regina), pressure sensor (Regina), oxygen sensor, knock sensor (EZ129K, turbo, and Motronic), mass airflow meter/sensor (Bosch, LH3.2, and Motronic), timing pick-up (Motronic) and throttle switch. ECU uses these input signals to control air/fuel mixture for emission control, fuel economy and good driveability. On 4 and 5-cylinder models, ignition control is provided by a separate ignition ECU. On 6-cylinder models, ignition and fuel controls are provided by a single ECU.