LH 2.4 Fuel Injection System Additions

LH 2.4 fuel injection system

The LH 2.4 fuel injection system has been introduced on all M1988 and later cars with a B202i engine and on all M1988B and later Turbo cars. This system is a further development of the earlier LH 2.2 fuel injection system. The improvement consists primarily of an expanded memory capacity for the control module, as a result of which the module is fitted with a 35-pin connector.

Special LH 2.4 functions:
- Control module with expanded memory
- IAC valve with integral Limp-Home system
- Adaptive (intelligent) idling control system
- Adaptive Lambda system
- Integral deceleration function (fuel shut-off)
- Improved function for shift-up indication
- New CP valve
- Integrated fault-diagnosis system
- Pressure-switch function integrated in control module

M1990 and later cars have additional LH 2.4 functions:
- Wider scope for diagnosis with the integrated fault-diagnosis system
- New control module
- Possibility of carrying out fault diagnosis and fault tracing using an ISAT (Intelligent Saab Tester)

On M1991 and later cars a number of new diagnostic trouble codes, which can be read on an ISAT, have been included in the fault diagnosis system.