Fuel and exhaust systems - Mono Jetronic fuel injection

The Mono-Jetronic central fuel injection system is fitted to the 1.8 litre (code RP) engine. It is a simplified method of fuel injection (see illustrations). Fuel is injected into the inlet manifold by a single solenoid valve (fuel injector) mounted centrally in the top of the injector unit housing.
The length of time for which the injector remains open determines the quantity of fuel reaching the cylinders for combustion. The electrical signals which determine the fuel injector opening duration are calculated by the Electronic Control Unit (ECU) from information supplied by its network of sensors. Fuel pressure is regulated mechanically.

The signals fed to the ECU include the following:
a) The engine coolant temperature
b) The engine speed and crankshaft position - from the distributor
c) The position of the throttle valve plate - from the throttle position sensor
d) The oxygen content in the exhaust gases - via a sensor (Lambda probe) in the exhaust manifold
Using the information gathered from the various sensors, the ECU sends out signals to control the system actuators as required. The ECU also has a diagnostic function which can be used in conjunction with special VW test equipment for fault diagnosis. With the exception of basic checks to ensure that all relevant wiring and hoses are in good condition and securely connected, fault diagnosis should be entrusted to a VW dealer. Basic testing can be carried out on the system components covered in the following text. More detailed testing can be carried out by using specialised equipment but this must be entrusted to a VW dealer.

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1994 Subaru Impreza Service Manual

Engine section : on car service, engine (DOHC), engine lubrication system, fuel injection system, fuel system, exhaust system, clutch, engine and transmission mounting system, transmission and differential section : manual transmission and differential, automatic transmission and differential, AWD system.

Mechanical components section : Suspension, wheels and axles, steering system, brakes, pedal system and control cables, Air conditioning system. Body section : body and exterior, instrument panel, supplement restraint system. Electrical system : body electrical system. Diagnostics system : fuel injection system, body electrical system, wiring diagram. Schedule of inspection and maintenance services : Drive belts, except camshaft, inspect drive belt tension, Camshaft drive belt (Timing Belt), engine oil, engine oil filter, replace engine coolant and inspect cooling system, hoses and connections, replace fuel filter and inspect fuel system, lines and connections, Air cleaner element, Spark plugs. Automatic transmission flud, brake fluid. Service procedure : precaution, on-car service, performance test, overall transmission, reduce drive gear assembly, control valve body, oil pump assembly, drive pinion shaft, reverse clutch, high clutch, forward clutch, high clutch, Differential case assembly.

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E11 Series Fuel and Ignition Control System

The HALTECH E11 is a powerful “real-time” programmable fuel injection system computer designed for those seeking optimum performance. With the large number of outputs available for controlling ignition and fuel, the E11 is well equipped to run engines with sequential fuel and modern multi-coil ignition systems.

The programming software for the E11 is the latest Halwin software package that is included with the ECU. This software takes advantage of the Windows™ graphical environment to provide a user friendly software package. The Halwin software allows access to adjustment of all settings and calibration maps. In addition the software is capable of displaying live data in the fom of graphical guages for easy viewing whilst connected to the ECU.

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