Vw l jetronic fuel injection workshop manual author. In addition to the full range of more than 10,000 items for gasolineinjection systems, bosch also supplies the aftermarket and work. Diesel injection pumps supply fuel at very high pressure. Jetronic is a trade name of a fuel injection technology for automotive petrol engines, developed.
The dedicated shade tree mechanic can do it, but needs to be wellinformed first. Bosch ljetronic fuel injection guide fiat fuel injected. 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. Early jecs systems were ljetronic, with bosch moving vane airflow meters. Vw ljetronic fuel injection workshop manual author. Bosch ljetronic fuel injection brandeis university. Since their introduction, jetronic fuel injection systems have proved. The l jetronic was the first massproduced, fully electronic fuel injection system. Basically, it is pretty similar to the kjetronic with some changes and modifications. With the engine running, touch a long shaft such as a screwdriver to the injector and listen to the opposite end. Gtv6 and milano, however if you own any car with bosch ljetronic injection the article will.
Jetronic controls fuel supply while the electronic ignition system provides optimal ignition control. Being familiar with the plumbing and quirks of the 928 could lead to less troubleshooting time and a lower repair bill. It is a socalled hybrid a mixture of mechanical and electronic injection systems. 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. Bosch superseded the djetronic system with the kjetronic and ljetronic systems for 1974, though some cars such as the volvo 164 continued.
Today, it has been superseded by gasoline injection systems which thanks to. Vw l jetronic fuel injection workshop manual created date. It is that macro execution stage that is usually the target for attack, as it provides a way to run code. Prior to ljetronic, 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. Combining this direct injection theory with electronic sensors, valves, and meters all. Monojetronic is an electronically controlled, lowpressure, singlepoint injection spi system for 4cylinder engines. The 12v falls to 0v for period t i and then a brief spike. By contrast, in the surface carburetor, in which the fuel was heated by. Ljetronic was often called airflow controlled afc injection to further separate it from. The injection function of the motronic system is based on the well tried l jetronic system, although a number of refinements have improved operation.
Gasoline fuel injection system mono jetronic pdf995 bitbin. Pdf application of hybrid ics to the automotive electronics market. The complete system contains the following components. If in doubt, spray break cleaner on pipes, hoses, injectors, intake manifold and map sensor. Bosch l jetronic l jetronic rx7 brought to you by the team at created date. Lh jetronic injection manifold1982 and later b21 and b23flh models a quick way to check injectors is simply to listen to them. The ljetronic was the first massproduced, fully electronic fuel injection system. It differentiates from the lejetronic for having, in addition to the injection system, also the ignition system incorporated in the command unit. 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. Testing an ljetronic injection valve at the technical center schwieberdingengermany. The injection pumpfuel distributor assembly is driven. 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.
Bosch ljetronic fuel injection manual volkswagen type2vanagon djetronic fuel injection pro training manual. 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. Fuel injection system the ke2jetronic fuel injection system is fitted to turbocharged engines. Jecs corporation is an automotive components company headquartered in isesaki, gunma. Le is the german designation of the european version of their air flow meter, with lu being the designation. It features a lambda probe aggregated to the injection system, installed in the exhaust pipe. Gregs bosch l jetronic fuel injection idle adjustment, diagnostic and tune up page, latest revision sept. The l jetronic aod ils variants are electro nically controlled fuelinjection systems solenoidopersle injection spi system for 4cylinder engines. Offidle and postcranking only work below a r616 specified level of resistance on the coolant temperature ntc.
Ljetronic fuel injection technical troubleshooting article. Many of them use a fuel pump essentially identical to the carbureted fuel systems. The following table is a guide to the fuel paths marked by each blue arrow in figure 6. Jetronic, lhjetronic, and motronic as an integrated engine management system. Product information automotive gasoline systems diagnostics and. 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. 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. Ljet bosch l jetronic fuel injection acronymfinder. Compared with ljetronic, the fuel injectors used by le. If the inlet air temperature sensor fails its resistance tests, you cant service just the sensor. Approximately up until 1994 mechanical fuel injection systems have been installed on certain mercedes, audi, volkswagen, ford etc. Bosch l jetronic fuel injection manual volkswagen type2vanagon d jetronic fuel injection pro training manual. Ljet is defined as bosch l jetronic fuel injection very rarely. Digital data processing and microprocessors make it possible to translate extensive operating information.
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. 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. The key problem with pdfs, word documents etc is that the current standards allow macros and executable code. Between the years 1973 and 1995, the highly reliable, mechanical multipoint injection system kjetronic was installed as original equipment in seriesproduction vehicles. Next, it is good if the jetronic literate mechanictechnician be familiar with 928s.
Select multiple pdf files and merge them in seconds. Le is the german designation of the european version of their air flow meter, with lu being the designation of the us version, i. The following is a summary of the symptoms, causes and corrections from section workshop manual page 24 21. 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. In my opinion this is a fatal flaw, but then i like emails to be text only. Drag and drop the pdf files you want to combine or click add to add files.
Bosch ke3 jetronic 539 89 injection system manual 328 mondial to read online or download as pdf. Ljetronic usjapan 1980 1984 there are always questions about fuel injection related problems. Dec 25, 2014 chapter 5 of d jetronic article series by drdjet describes the electrically operated injection valve. Latest trends in automotive electronic systems highway. Onsomel jetronic systems, the air temperature sen sor is visible in the air flow meter inlet. 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. The period t i is a function of the on time of the fuel injector as initiated by the lh fuel injection controller. 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. How is bosch l jetronic fuel injection abbreviated.
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. 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 k jetronic system. Bosch le jetronic bmw copyright equiptech boschlejetronic thereismuchconfusionabouttheactualtypeofinjectionsystemfittedtomanybmwmotorcarsduringtheperiod1980to. 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. Before joining bosch, i studied in history and philosophy at universities of.
Some, however, use a vane type fuel pump mounted directly to the injection pumpfuel distributor assembly. Electronic multipoint injection system initially analog, later digital. 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. Combining this direct injection theory with electronic sensors, valves. Between the years 1973 and 1995, the highly reliable, mechanical multipoint injection system k jetronic was installed as original equipment in seriesproduction vehicles.
Or lets have a look at one more version bosch cise continuous injection system electronic. This manual is designed to assist the technician unfamiliar with robert bosch fuel injection systems in locating faults in the ljetronic system, isolating. Bosch lejetronic fuel injection system volvo owners club. 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. Mechanical fuel injection bosch k jetronic, bosch k jetronic fig. The ecu was much cheaper to produce due to more modern components, and was more standardised than the ljetronic ecus. These fuel injection systems were considered to be really reliable and trustworthy. The main feature of mono motronic system is the existence of a single. Fuel injection system the ke2 jetronic fuel injection system is fitted to turbocharged engines. L jetronic usjapan 1980 1984 there are always questions about fuel injection related problems. This signal is then brought to the upper board of the ljetronic. Le1jetronic, le2jetronic, le3jetronic 19811991 this is a simplified and more modern variant of ljetronic.
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. The offidle enrichment, postcranking enrichment and and coastingcutoff are on this board. As per ljetronic, a vanetype airflow sensor is used. Chapter of d jetronic articles by drdjet describes systematic fault finding troubleshooting and repair on your bosch fuel injection system. Vw ljetronic fuel injection workshop manual created date. Please rate chapter 5 of djetronic article series by drdjet describes the electrically operated injection valve.
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. These adjustments are intended to be followed by an. Bosch k jetronic fuel injection manual linkedin slideshare. The fuel pump, located in the fuel tank, pumps the fuel through a filter to the single fuel injector. A computer controls the injection and ignition systems with reference to shared optimization criteria.
A book in the haynes service and repair manual series. It was the original schematic for an electronic gasoline injection system. Gasoline injection systems gasolineinjection systems carburetors and gasolineinjection sys representative examples are the various tems are designed for a single purpose. Pdf in the last few years hybrids have been increasingly used in automotive.