With the engine running, touch a long shaft such as a screwdriver to the injector and listen to the opposite end. Lh jetronic injection manifold1982 and later b21 and b23f lh models a quick way to check injectors is simply to listen to them. The early jecs lh jetronic systems were based on a motorola. Note the orientation of the protruding alignment notch. Lhjetronic injection manifold1982 and later b21 and b23flh models a quick way to check injectors is simply to listen to them. Possibly the intake port need to disable and plug the cold start injector. Kjetronic system overview fuel supply 14 fuel metering 18 adapting to operating conditions 24 supplementary functions 30 exhaustgas treatment 32 electrical circuitry 36 workshop testing techniques 38 kjetronic since its introduction, the kjetronic gasolineinjection system has proved itself in millions of vehicles. Before troubleshooting, testing or adjusting the k jetronic fuel injection system, the ignition system and the mechanical system of the engine compression, valve timing, etc. Basically, it is pretty similar to the kjetronic with some changes and modifications. Interject kjetronic servicing and cleaning procedure 1.
Gregs bosch l jetronic fuel injection idle adjustment, diagnostic and tune up page, latest revision sept. Ljetronic the bosch ljetronic also called afcair flow controlled fuel injection was put into usspec type 4s in the last model year 1974. If there is spark, then the ignition system is working, there is no need to test the engine rpm speed sensor or ezk output stage. Start the engine and bring up to normal running temperature. L jetronic principle with electronic mapcontrolled ignition. The lejetronic system is electronically commanded and injects the fuel in the intake manifold. Mar 27, 2006 read above, i explained that lh jetronic has 2 seperate controllers and motronic controlls them togeather. Disconnect the return line from the distributor head 6a, and connect a hose from the. This synthesis, comprising the mechanical basic functions coupled with electronic adap tation and opti mization functions, is the kejetronic. There is alot of information on high performance lh jetronic systems but the problem with the system as far as i know is its inability to measure large amounts of airflow without moddifications since it uses a total flow sensor as far as. Or lets have a look at one more version bosch cise continuous injection system electronic. 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. New design reduces potential damage by separating the gauges and manifold from the canister during filling.
Anyhow here is the link bosch k jetronic fuel injection manual. This chart is a summary of bosch lhjetronic components for the saab 900 and 9000 cars, from 1984 through 1994. Hookup the auxiliary fuel tank and fittings as shown on page 4. The easiest way to tell is to look at the maf sensor. The most common cause of lhjetronic ecu failure is. L jetronic system fuel injectors n open when energized by ecu not continuous as k jetronic. Gregs bosch ljetronic fuel injection idle adjustment, diagnostic and tune up page, latest revision sept. New design reduces damage to the oring by limiting exposure to cleaning solution. By club member john hall, who worked for volvo usa for many years. Ke jetronic troubleshooting for most pre1991 manufactured w124s, the fuel injection system on these engines are mostly using bosch kejetronic.
It is a socalled hybrid a mixture of mechanical and electronic injection systems. Onsomel jetronic systems, the air temperature sen sor is visible in the air flow meter inlet. As stated in the video, you have access to all measures of the original software. New check valve prevents fluid from backing up through the regulator. A thorough understanding of the various components is required before working on k jetronic fuel systems. The ezk ignition module from the same car as the lh jet 572 the whole harness from the lh jet and exk modules into the engine bay. By the mid1980s, jecs were using lh jetronic, and the new bosch hotwire mass airflow meter.
New design incorporates anodized bottle with permanent laser etching for a sleeker appearance. There is alot of information on high performance lh jetronic systems but the problem with the system as far as i know is its inability to measure large amounts of airflow without moddifications since it uses a total flow sensor as far as my information says. Vw ljetronic fuel injection workshop manual created date. The le jetronic command unit receives various input signals, from the various sensors that send precise information about the instant engine operation conditions. Anyhow here is the link bosch kjetronic fuel injection manual. B 230 f gasoline engine with fuel injection and cataly tic con erter system. Bosch ljetronic l jetronic rx7 brought to you by the team at created date. Ljetronic fuel injection technical troubleshooting article.
A thorough understanding of the various components is required before working on kjetronic fuel systems. Created on 20110617 by kevin rutledge, last updated on 20181112. Monojetronic fuelinjection system system overview monojetronic is an electronically controlled, lowpressure, singlepoint injection spi system for 4cylinder engines. Signification des cas specifiques c o mposants et accessoires. Interject k jetronic servicing and cleaning procedure 1. Jun 08, 2012 this video shows how to engineer modelbased functions for the lh jetronic 2. Vw ljetronic fuel injection workshop manual author. The ezk ignition module from the same car as the lhjet 572 the whole harness from the lhjet and exk modules into the engine bay. Bosch le jetronic bmw copyright equiptech boschlejetronic thereismuchconfusionabouttheactualtypeofinjectionsystemfittedtomanybmwmotorcarsduringtheperiod1980to. K jetronic system overview fuel supply 14 fuel metering 18 adapting to operating conditions 24 supplementary functions 30 exhaustgas treatment 32 electrical circuitry 36 workshop testing techniques 38 k jetronic since its introduction, the k jetronic gasolineinjection system has proved itself in millions of vehicles. How can i tell which version of bosch lh fuel injection is on. Ke jetronic troubleshooting for most pre1991 manufactured w124s, the fuel injection system on these engines are mostly using bosch ke jetronic. 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.
There are 4 variations of bosch lh jetronic on volvo 240 models. This video shows how to engineer modelbased functions for the lh jetronic 2. While port injection systems such as ke and l jetronic employ a separate injector for each cylinder, mono jetronic features a single, centrallylocated, solenoidcon. Air mass meter amm with aluminum body and adjustable mixture. Then, the command unit processes this information received and calculate the appropriate fuel injection time, through an electric signal. Mono jetronic fuelinjection system system overview mono jetronic is an electronically controlled, lowpressure, singlepoint injection spi system for 4cylinder engines.
Vw l jetronic fuel injection workshop manual author. Bosch licensed the concept to many automobile manufacturers. Ac switch system relay pressure regu lator fuel distribution. Though mostly mechanical in nature and lacking the feedback o2 sensor to correct the airfuel mixture, it was considered sufficient in providing the control of the injection of fuel back in the days. This video shows how to engineer modelbased functions for the lhjetronic 2. The charts are broken out by lh system version and catalyst or no catalyst. Ljetronic system air mass measurement n fuel injection system has to know mass of air n airflow meter provides air mass flow information u mass is calculated by volume flow and density f need device to determine flow air flap on airflow meter f need temperature to determine density temperature sensor in air flow meter afm 1 throttle plate 2 air flow. Lele2lu a 010902021 9705 1 operation lele2lu jetronic foreword the multitester pluspro software cassette is the component that gives the diagnostic equipment its unique test characteristics. Before troubleshooting, testing or adjusting the kjetronic fuel injection system, the ignition system and the mechanical system of the engine compression, valve timing, etc. Check the system pressure and flow with the lb2912f. Use caution, the 928 spark system produces high voltage and can cause death or serious injury. If the inlet air temperature sensor fails its resistance tests, you cant service just the sensor. There are 4 variations of bosch lhjetronic on volvo 240 models. Bosch l jetronic l jetronic rx7 brought to you by the team at created date.
You can both modify parameterscurvesmaps and read out all internal values. There are several variations of the technology offering technological development and refinement. There are two separate temperature sensors housed in the one sensor body in lh fuel injected 928s, one sensor is for the lh and the other for the spark module. Onsomeljetronic systems, the air temperature sen sor is visible in the air flow meter inlet. The injection has as function to provide the amount of fuel exactly dosed. Now im not sure because i havent tried it but i would imagine if one were to install the lh2. The most common cause of lh jetronic ecu failure is the hybrid control circuit. Vw l jetronic fuel injection workshop manual created date. Read above, i explained that lh jetronic has 2 seperate controllers and motronic controlls them togeather.