Electronic Control Unit
The Electronic Control Unit (ECU) continually corrects air/fuel mixture, based on signals from oxygen sensor. The ECU sends signals to differential pressure regulator, located on the fuel distributor. See Figure .
The CIS-E Motronic engine management system uses a single control unit for fuel injection, idle speed control, ignition, and emission controls. The oxygen sensor in the CIS-E Motronic system can adjust its range in response to changes in operating conditions. See Figure and Figure .
ECU LOCATION
| Application | Location |
|---|---|
| Corrado & Passat | Behind Firewall In Rear, Center Of Engine Compartment |
| GTI 2.0L & Jetta GLI | Behind Left Firewall, Rear Of Engine Compartment |
NOTE:
Components are grouped into 2 categories. The first category covers INPUT DEVICES, which control or produce voltage signals monitored by the control unit. The second category covers OUTPUT SIGNALS, which are components controlled by the control unit.