Page 20 l jetronic system diagram the next diagram is a schematic drawing of the complete l jetronics fuel injection system. Ii ill poor throttle response l 11 111, l engine misfires during high speedload operation i engine runs on. Prior to ljetronic, mechanical fuel injection systems had proven that directly injecting atomized fuel into the cylinder resulted in better engine operation. These early motronic systems integrated the spark timing element with thenexisting jetronic fuel injection technology. Stefan aachen hebrews nt wright for everyone bible study guidesmaytag mhw5500fc 4 5 cu ft front load washer with freshred cross wsi manualjurnal penyakit jantung koroner dftoseland and. Bosch l jetronic shop service repair workshop manual. The service function operates independently of the injection ecu on l and le models. The fuel pump, located in the fuel tank, pumps the fuel through a filter to the single fuel injector. The le jetronic system is analog, and therefore it does not keep in memory possible damage that may occur. The ezk spark control is the system master, if engine rotation signals are not provided to the ezk, spark will not be generated and the ezk will not provide a turnon signal to the lh jetronic fuel injection system. This diagram was adapted from the porsche 912e workshop manual and has been enhanced to provide additional information to assist in isolating fuel injection problems.
The l jetronic was the first massproduced, fully electronic fuel injection system. Above all popular belief it takes these modules quite a bit to go bad. Robert bosch ljetronic efi system using mostly common workshop tools. You should understand this fuel injection system before you begin working.
Gasoline injection systems overview 10 ke jetronic system overview, advantages 12 fuel supply 14 fuel metering 18 adaptation to operating conditions 22 supplementary functions 33 electrical circuitry 36 workshop testing techniques 38 ke jetronic since their introduction, the ke jetronic systems have proved themselves in millions of automobiles. Bosch l jetronic injection manual l jetronic injection author. Today, it has been superseded by gasoline injection systems which thanks to. Between the years 1973 and 1995, the highly reliable, mechanical multipoint injection system k jetronic was installed as original equipment in seriesproduction vehicles. Bosch k jetronic fuel injection manual pdf document. Bosch ke jetronic system the bosch ke jetronic fuel injection system is fitted to escort rs turbo models and is a further development of the k jetronic system. Ljetronic fuel injection system the l jetronic is an electronically controlled fuel injection system which has the advantage of direct air flow sensing. The earliest bosch installations were the d jetronic and l jetronic systems, and we can still find their operating principles at work in vehicles for the 2001 model year. In the le jetronic system, the injection valves spray the fuel simultaneously, what is to say, they are all driven at the same time. The l jetronic aod ils variants are electro nically controlled fuel injection systems solenoidopersle l jetronic in iha bosch technical instruclion series. In this type of system each cylinder has its own injector discharging fuel into the area directly in front of the intake valve. Gasoline fuel injection system ljetronic bosch pdf. An air flow meter, located in the air intake chamber, converts angular movement of an air baffle plate into a voltage signal, which is sent to the control unit.
L jetronic system throttle and idle control n throttle opens to allow more air to sucked in to engine n small amount of air bypasses the throttle so the engine gets air and will idle. Gtv6 and milano, however if you own any car with bosch ljetronic injection the. Digital data processing and microprocessors make it possible to translate extensive operating. I am pretty lost as to all the connections, especially to the manifold itself. There are several variations of the technology offering technological development and refinement. Representative examples are the various versions of the ke and l jetronic systems figure 1. For the first 30 seconds, up to 60% additional fuel will be provided to. The term across the injector takes manifold pressure and fuel rail pressure into account, and is usually referred to as delta pressure. The d jetronic controlled by intakemanifold pressure. While new carburated engines were used in the european markets, vw adapted the l jetronic for the type 4 in the us due to more stringent emissions and fuel consumption regulations.
Our bosch fuel injection pumps workshop manuals contain indepth maintenance, service and repair information. Inhibit the operation of the fuel injection system during this test by removing the fuel injection fuse. Bosch licensed the concept to many automobile manufacturers. Domestic carmakers adopted electronic fuel injection extensively on breadandbutter production cars in the early 80s. Apart from minor alterations the basic principles of the hydraulics and mechanics used on the k jetronic system are unchanged on the ke jetronic system. Free download free online viewing free printables home all car manuals online how to download pdf for free about us. Gasoline fuel injection system l jetronic bosch pdf download. Please consult your local distributor for those items you may require. If your bike is a abs model in the tail section is the abs control unit. A thorough understanding of the various components is required before working on k jetronic fuel systems. The following table is a guide to the fuel paths marked by each blue arrow in figure 6.
By controlling both major systems in a single unit, many aspects of the engines characteristics such as power, fuel economy, drivability, and emissions can be improved. The task of a fuel injection system is to supply precise amount of fuel to the combustion chamber at that particular moment. This page was last edited on 30 novemberat sequential fuel injection and knock control. Bosch digifant engine management system jetronic motronic. Before troubleshooting, testing or adjusting the k jetronic fuel injection system, the.
Vw ljetronic fuel injection workshop manual created date. Mechanical injection systems the k jetronic system operates by injecting continually, without an external drive being necessary. In this system, the injection command unit controls only the fuel system. Bosch l jetronic l jetronic rx7 brought to you by the team at created date. The first one is under the fuel tank is the ignition control unit icu, under the seat is is the fuel injection control unit l. The nominal injection pressure for many ford efi systems is 39. Jetronic is a trade name of a fuel injection technology for automotive petrol engines, developed and marketed by robert bosch gmbh from the 1960s onwards. The bosch l jetronic fuel injection system is electronically controlled to regulate the fuel supply in relation to the air flow. Reparation et entretien des systemes dinjection dessence. I am writing this article specifically from the point of view of a u. Ke3 jetronic pdf mercedes suggests that special tools are required to adjust the mixture on the bosch ke3 jetronic. A computer controls the injection and ignition systems with reference to shared optimization criteria. How to professionally tint a car door window 20 vw jetta for beginners duration. I just purchased it with the computer brain and manifold.
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