General System Description

Motronic Engine Management System V-8:

Bosch Motronic for the 4.2 Liter V-8

The Motronic Engine Management System combines the ignition system and fuel injection system and controls both electronically with one control module.

The Motronic control module has an internal digital micro-computer. A number of three dimensional maps are stored in the control module's memory. These maps are used to control ignition timing, knock regulation, injection timing and all other subsystems.

Motronic Subsystems

Sequential Fuel Injection
^ Basic adaptation
^ Start control
^ After-start enrichment
^ Acceleration enrichment
^ Deceleration fuel shut-off
^ Engine rev limiter
^ Oxygen sensor control with adaptation

Ignition
^ Basic ignition map
^ Dwell angle control
^ Warm-up control
^ Start control
^ Initial shift point control (automatic trans only)
^ Cylinder selective knock control

Idle Speed Control
^ Basic adaptation
^ Map controlled
^ Start controlled
^ Initial climate control (A/C ON/OFF)
^ Initial idle speed control (trans in gear, auto trans only)

Exhaust Gas Recirculation
^ Map controlled
^ Exhaust gas temperature sensor
^ Deceleration fuel shut-off

Evaporative Emission System
^ Map controlled
^ Deceleration shut-off

Oxygen Sensor
^ Map controlled
^ Temperature controlled

Advantages

The advantages of using the Motronic system include:
^ Optimum fuel economy due to low fuel consumption through adaptation of all operating conditions.
^ Emission control with adaptation of injection rate and ignition timing.
^ Reduced maintenance and ease of servicing due to improved diagnostics.