Turbo

Fig. 39 Engine Control System:

The CIS (Bosch K-Jetronic) fuel injection system used on the turbo engines is mechanically similar to the injection system used in earlier models. This system is different electronically in that the ECU has more control over other engine functions such as turbo boost and ignition timing.
The mechanical portion of the CIS system consists of a mixture control unit (air flow meter and fuel distributor), control pressure regulator, auxiliary air valve, cold start valve, throttle body, injector nozzles, fuel pump and fuel filter.
The electronic portion of the system consists of an engine speed sensor, air and coolant temperature sensors, ignition knock sensor, oxygen sensor, and an intake manifold pressure sensor. With the signals supplied by these sensors, the ECU controls the cold start, fuel enrichment, boost limiting, and ignition timing functions.
The CIS system is designed to provide adequate operation in the event of an ECU malfunction. The system is also equipped with over-voltage protection for its more sensitive electronic components.