Injection-ignition ECU (control unit)

Connects all Bosch Motronic M 2.7 injection/ignition system components and provides them with electricity.

It consists mainly of an electronic control unit (control unit) and the following parts.

• Two main control relays (electric fuel pump - control unit)
• Throttle valve position sensor
• Coolant temperature sensor
• Intake air temperature sensor
• Fuel pump submerged in tank
• Four injectors
• Intake air flow meter (hot wire debimeter)
• Engine idle speed actuator
• Rpm and TDC sensor
• Injection timing sensor
• Absolute pressure sensor (barometric capsule)
• Detonation sensor
• Turbo pressure regulation solenoid (Pierburg)
• Detonation sensor
• Lambda probe
• Power module for ignition
• Ignition coil with four high tension outlets
• Four spark plugs
• Solenoid (Bosch) for fuel vapour controla
• Diagnostic socket for Fiat/Lancia Tester
• Injection-ignition system failure warning light

Injection-ignition ECU (control unit)

The Bosch Motronic M 2.7 injection-ignition system fitted is specific to this version.

It consists of hybrid thick film circuits and is connected to the electrical wiring by means of a multiple connectora 55 way (or poles).

These receive data on all engine service conditions from the various sensors:

• inlet air quantity
• inlet air temperature
• coolant temperature
• engine rpm and TDC
• injection timing signal
• throttle valve position
• vehicle speed signal
• knock signal
• lambda signal

According to the signals processed, the ECU pilots the actuators, calculates the optimum ignition advance level and demagnetizes the two ignition coil primary windings.