LH denotes that this is a "hot wire" system. The system is fully electronically controlled and incorporate a number of sensors, whose signals are processed by a control unit. There are several different versions of the LH system, including the 2.2, 2.4, 3.1 and 3.2. The Bosch LH-Jetronic system is used in combination with the EZK ignition system and the turbocharged control system, where applicable. The LH fuel system is characterized by the following:
Several sensors feed the control unit information to precisely control fuel injection. To accomplish this, the control unit evaluates: exhaust gas oxygen content from the oxygen sensor (Lambda-sond), engine RPM and crankshaft position information from the ignition system control unit (if information is not received, the fuel system control unit will not function), engine temperature from the coolant temperature sensor, engine load information from the air mass meter, information from the throttle switch, which indicates if the throttle is closed or wide open, electrical system voltage from the battery current and signals from the A/C switch and clutch, indicating whether they are operating.