The ljetronic is an electronically controlled injection system with. Fuel injection system the ke2jetronic fuel injection system is fitted to turbocharged engines. Gasolineinjection systems overview 10 kejetronic 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 kejetronic since their introduction, the kejetronic systems have proved themselves in millions of automobiles. Please rate chapter 5 of djetronic article series by drdjet describes the electrically operated injection valve. Combining this direct injection theory with electronic sensors, valves. Chapter of d jetronic articles by drdjet describes systematic fault finding troubleshooting and repair on your bosch fuel injection system. Before joining bosch, i studied in history and philosophy at universities of. Bosch l jetronic fuel injection manual volkswagen type2vanagon d jetronic fuel injection pro training manual. Or lets have a look at one more version bosch cise continuous injection system electronic. It is that macro execution stage that is usually the target for attack, as it provides a way to run code. As per ljetronic, a vanetype airflow sensor is used. Monojetronic is an electronically controlled, lowpressure, singlepoint injection spi system for 4cylinder engines. Bosch l jetronic l jetronic rx7 brought to you by the team at created date. Bosch le jetronic bmw copyright equiptech boschlejetronic thereismuchconfusionabouttheactualtypeofinjectionsystemfittedtomanybmwmotorcarsduringtheperiod1980to.
Next, it is good if the jetronic literate mechanictechnician be familiar with 928s. The l jetronic aod ils variants are electro nically controlled fuelinjection systems solenoidopersle injection spi system for 4cylinder engines. The ecu was much cheaper to produce due to more modern components, and was more standardised than the ljetronic ecus. Ljetronic components kejetronic components motronic components renowned vehicle manufacturers rely on bosch as original equipment supplier and thus form the basis for a fruitful replacement parts business. Fuel injection system the ke2 jetronic fuel injection system is fitted to turbocharged engines.
Product information automotive gasoline systems diagnostics and. The complete system contains the following components. This signal is then brought to the upper board of the ljetronic. Bosch k jetronic fuel injection manual linkedin slideshare. Latest trends in automotive electronic systems highway. Ljetronic the bosch ljetronic also called afcair flow controlled fuel injection was put into usspec type 4s in the last model year 1974. Digital data processing and microprocessors make it possible to translate extensive operating information. The following table is a guide to the fuel paths marked by each blue arrow in figure 6.
L jet stands for bosch l jetronic fuel injection suggest new definition this definition appears very rarely and is found in the following acronym finder categories. While new carburated engines were used in the european markets, vw adapted the ljetronic for the type 4 in the us due to more stringent emissions and fuel consumption regulations. Vw ljetronic fuel injection workshop manual created date. A book in the haynes service and repair manual series. The fuel pump, located in the fuel tank, pumps the fuel through a filter to the single fuel injector. Between the years 1973 and 1995, the highly reliable, mechanical multipoint injection system kjetronic was installed as original equipment in seriesproduction vehicles. Bosch lejetronic fuel injection system volvo owners club. Ljet bosch l jetronic fuel injection acronymfinder. Ljetronic fuel injection technical troubleshooting article. Onsomel jetronic systems, the air temperature sen sor is visible in the air flow meter inlet. 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. The offidle enrichment, postcranking enrichment and and coastingcutoff are on this board. Prior to l jetronic, mechanical fuel injection systems had proven that directly injecting atomized fuel into the cylinder resulted in better engine operation.
Thisis necessary due to the added complexity and increased power output of the engine, the system provides a higher degree of mixture strength control than that provided by the kjetronic system. The 12v falls to 0v for period t i and then a brief spike. Lh jetronic injection manifold1982 and later b21 and b23flh models a quick way to check injectors is simply to listen to them. Mechanical fuel injection bosch k jetronic, bosch k jetronic fig. Nov 21, 2009 gasoline injection systems gasoline injection systems carburetors and gasoline injection sys representative examples are the various tems are designed for a single purpose. Jetronic, lhjetronic, and motronic as an integrated engine management system.
Basically, it is pretty similar to the kjetronic with some changes and modifications. 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. The period t i is a function of the on time of the fuel injector as initiated by the lh fuel injection controller. Drag and drop the pdf files you want to combine or click add to add files. Gasoline injection systems gasolineinjection systems carburetors and gasolineinjection sys representative examples are the various tems are designed for a single purpose. Jecs corporation is an automotive components company headquartered in isesaki, gunma. Combining this direct injection theory with electronic sensors, valves, and meters all. It differentiates from the lejetronic for having, in addition to the injection system, also the ignition system incorporated in the command unit. Jetronic controls fuel supply while the electronic ignition system provides optimal ignition control. Offidle and postcranking only work below a r616 specified level of resistance on the coolant temperature ntc. These fuel injection systems were considered to be really reliable and trustworthy. How is bosch l jetronic fuel injection abbreviated.
Ljetronic usjapan 1980 1984 there are always questions about fuel injection related problems. Ljet is defined as bosch l jetronic fuel injection very rarely. Le1jetronic, le2jetronic, le3jetronic 19811991 this is a simplified and more modern variant of ljetronic. It features a lambda probe aggregated to the injection system, installed in the exhaust pipe. It was the original schematic for an electronic gasoline injection system. Prior to ljetronic, mechanical fuel injection systems had proven that directly injecting atomized fuel into the cylinder resulted in better engine operation. Bosch ljetronic fuel injection brandeis university. Diesel injection pumps supply fuel at very high pressure. Vw l jetronic fuel injection workshop manual author.
The bosch fuel injection and engine management is a must have book for the serious automotive enthusiast or professional fuel injection theory is as important to your cars performance as are the wheels and suspension system. Le is the german designation of the european version of their air flow meter, with lu being the designation. Dec 25, 2014 chapter 5 of d jetronic article series by drdjet describes the electrically operated injection valve. Ljetronic electronic control unit ecu, airflow sensor, system relay, fuel pump relay, lambdasond oxygen sensor, vacuum switch, electric fuel pump, coolant temperature sensor, fuel injectors, and the electronic control unit terminal for the constant idle systems cis if equipped. If the inlet air temperature sensor fails its resistance tests, you cant service just the sensor. Early jecs systems were ljetronic, with bosch moving vane airflow meters. The following is a summary of the symptoms, causes and corrections from section workshop manual page 24 21. In my opinion this is a fatal flaw, but then i like emails to be text only. Today, it has been superseded by gasoline injection systems which thanks to. Vw ljetronic fuel injection workshop manual author.
The l jetronic aod ils variants are electro nically controlled fuelinjection systems solenoidopersle jetronic controls fuel supply while the electronic ignition system provides optimal ignition control. This manual is designed to assist the technician unfamiliar with robert bosch fuel injection systems in locating faults in the ljetronic system, isolating. Bosch developed an electronic fuel injection system, called djetronic d for druck, german for pressure, which was first used on the vw 1600tle in 1967. Thisis necessary due to the added complexity and increased power output of the engine, the system provides a higher degree of mixture strength control than that provided by the k jetronic system. The lele2lu jetronic system is a development of the earlier bosch ljetronic fuel injection system.
The bosch ljetronic fuel injection system used in the porsche 912e is often referred to as the air flow controlled or afc fuel injection system. Electronic multipoint injection system initially analog, later digital. Digital data processing and microprocessors make it possible to translate extensive operating. These adjustments are intended to be followed by an. Testing an ljetronic injection valve at the technical center schwieberdingengermany. Jetronic is a trade name of a fuel injection technology for automotive petrol engines, developed. The key problem with pdfs, word documents etc is that the current standards allow macros and executable code. By contrast, in the surface carburetor, in which the fuel was heated by. Bosch ljetronic fuel injection manual volkswagen type2vanagon djetronic fuel injection pro training manual.
The injection pumpfuel distributor assembly is driven. L jetronic usjapan 1980 1984 there are always questions about fuel injection related problems. The ljetronic was the first massproduced, fully electronic fuel injection system. Lele2lu a 010902021 9705 3 system description system description general the lele2lu jetronic system is a development of the earlier bosch ljetronic fuel injection system. Pdf in the last few years hybrids have been increasingly used in automotive. Kjetronic cis fuel system diagram shown below is a schematic diagram of fuel lines in a kjetronic as a whole with noise damper and drain line at the fuel accumulator. Between the years 1973 and 1995, the highly reliable, mechanical multipoint injection system k jetronic was installed as original equipment in seriesproduction vehicles. Many of them use a fuel pump essentially identical to the carbureted fuel systems. Mercedes suggests that special tools are required to adjust the mixture on the bosch ke3jetronic cise fuel injection, such as is used on the 198891 560 series motors. Being familiar with the plumbing and quirks of the 928 could lead to less troubleshooting time and a lower repair bill. The main feature of mono motronic system is the existence of a single. Pdf application of hybrid ics to the automotive electronics market. Gtv6 and milano, however if you own any car with bosch ljetronic injection the article will.
Le is the german designation of the european version of their air flow meter, with lu being the designation of the us version, i. Bosch ke3 jetronic 539 89 injection system manual 328 mondial to read online or download as pdf. The motronic ignition point and injection duration are jointly processed by the ecu so that the best moment for ignition and fuelling are determined for every operating condition. The l jetronic was the first massproduced, fully electronic fuel injection system. Some, however, use a vane type fuel pump mounted directly to the injection pumpfuel distributor assembly. Ljetronic was often called airflow controlled afc injection to further separate it from. The dedicated shade tree mechanic can do it, but needs to be wellinformed first. Originally, volkswagen adapted the ljetronic for the type 4 air cooled 411 engines sold in the united states due to more stringent emissions and fuel consumption regulations. In addition to the full range of more than 10,000 items for gasolineinjection systems, bosch also supplies the aftermarket and work. If in doubt, spray break cleaner on pipes, hoses, injectors, intake manifold and map sensor. While port injection systems such as ke and ljetronic employ a separate injector for each cylinder, monojetronic features a single, centrallylocated, solenoidcontrolled injection valve for the entire engine. Gregs bosch l jetronic fuel injection idle adjustment, diagnostic and tune up page, latest revision sept. Gasoline fuel injection system mono jetronic pdf995 bitbin. Approximately up until 1994 mechanical fuel injection systems have been installed on certain mercedes, audi, volkswagen, ford etc.
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