Bosch le2lu2 jetronic circuit cr4 discussion thread. Fuel injection system the ke2jetronic fuel injection system is fitted to turbocharged engines. The information is conveyed ro the ecu as a measure of engine load and is one of the elements used in the calculation of ignition timing and fuelling requirements. In vehicles with mt, pin 42 is directly connected to earth. As for ecu pinouts, the links below will provide all the info you need to debug any wiring issues with the 3b and aby engines. Bmw e12 l jetronic fuel injection systems schematic. The earth return connection for most engine sensors is made through an ecu pin that is not directly connected to earth. Jetronic s primitive management system only controlled fuelling, so the ecu is little more than an injection control unit. Basic engine combustion process, combustion requirements, fuel delivery implementations, electronic fuel injection system components, ljetronic system, troubleshooting, conversion to lambda control, and performance. Together with the ecu wiring diagram, basically what i used for reference when installing my.
The control model uses a 25pin plug, with pin 1 at the cable end. Several of the ecu output actuators and solenoids are protected by fuses in the main fuse box. The ecu internally connects that pin to earth via one of the ecu pins that are directly connected to earth. Not all stored faults may cause the fault warning lamp to illuminate. In many settings and measured values are described. Ignition voltage on the e28 is supplied to the combo relay by the green wire on the small connector next to the ecu. If you would just like to understand a bit more about how the ecu works and some answers to the more common questions and problems, id suggest reading the first three sections, then moving on to. There are several variations of the technology offering technological development and refinement. It is, therefore, possible this number may change during the life of the ecu.
It was reading like someone would hold the info and pdf files hostage, freed for a fee, some around 6. Bosch licensed the concept to many automobile manufacturers. I would add to each of the years the associated ecu part number. If you dont know which electronic control unit your car should have, just check the engine type and youll know which ignition system and ecu part number your car should have. Gtv6 and milano, however if you own any car with bosch ljetronic injection the article will still help. Also related to holdover relay with ecu for the maf. To access the connections, turn battery power off remove the plug from the fuel ecu, the ignition ecu plug can remain connected.
There are two water temperature sensors, one throttle position sensor, one exhaust sensor, and one air flow meter that all signal the ecu and must be operating correctly in order. By no means it shall replace bosch service manuals for your car that are more detailed describing cold start valve control, correct pressures, locations with photos and spare numbers. L jetronic system, although a number of refinements have improved operation. Now i have a little knowledge of mono jetronic fuel injection system. Diagram pdf somurich pdf toyota 1nz fe ecu engine wiring diagram temdesong porsche 928 ecu dme bosch lh jetronic 0280002504 0 280 002 504 specialized ecu repair 1nz fe ecu wiring diagram pdf somurich ecu dashboard immobox pin outs diagrams com may th, 2019 vag edc16 ecu pinout basic connection pinout for bosch edc16u1 edc16cp34. Dec 12, 2011 wise people, i have scoured the internet and a few libraries for a circuit diagram of a bosch le2 or lu2 jetronic ecu circuit diagram without success. This is a fairly technical document that has more information than many readers are looking for. Thought i would add a few of the most common ecu pinouts and wiring diagrams, as ive managed to get a pdf writer working as well as a copy of autodata. In which case this pin is pulled to 12v with the engine running and is used to empower the maf burnoff sequence with the engine off.
The main feature of mono motronic system is the existence of a single valve for all engine cylinders. The diagram at left click on it for a larger version is from a bosch pamphlet that explains the overall operation of the ecu. This number is for the ecu as a whole and provides for the including of any later uploaded changes. Fuel system k jetronic lambdathis page is dedicated to checking and, if need be, adjusting your k jetronic lambda fuel injection system. I am posting these here for posterity, as went down some time ago, and i dont know if will continue hosting it forever. Ive wanted to get this up for a while, and finally found some time to sit down and do it. You then click on clear faults to clear the fault code. Ecu pinout and electrical tests e30 rts your total bmw. Haynes diagram is good, but owners manual shows more. Ljetronic fuel injection systems for bmw e12s first fives. 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 ke2 jetronic fuel ecu pinout measurements bentley turbo r early 89 the fuel ecu is the black box above the accelerator pedal. They are generally only available in the domain of dealerships and a small number of audi specialists as addendums to the generic audi 8090 wiring info. So lets start with the 306 s16, bosch motronic mp3. In this unit the single pcb is surface mount on one side and leaded components on the other including two or. Chapter 3 of djetronic article series by drdjet describes the brain of djetronic. Fuel system kjetronic lambdathis page is dedicated to checking and, if need be, adjusting your kjetroniclambda fuel injection system. Wise people, i have scoured the internet and a few libraries for a circuit diagram of a bosch le2 or lu2 jetronic ecu circuit diagram without success. As i noticed, my uno have a problem with throttle position sensor, or you said potentiometer. As per ljetronic, a vanetype airflow sensor is used. The diagram below shows a typical fuel system arrangement, the. Chapter 3 of djetronic article series by drdjet describes the brain of. Our world class customer service team can help you find the best ecu and. 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.
Appendix b of d jetronic article series by drdjet lists pinout of all ecus of all d jetronic equipped cars. A 55 pin connector and multiplug connects the ecu to the battery, sensors and actuators. The diode blocks current from megasquirt on 86b from flowing to 86a and engaging the starter while the car is running starting or running. Ecu internally connects that pin to earth via one of the ecu pins that are directly connected to earth. Oct 27, 2012 9 responses to ecu pinout and electrical tests e30.
Unfortunately due to the file limits its one per post. All sensors are used here to calculate when and how long to open the fuel injectors. Le1jetronic, le2jetronic, le3jetronic 19811991 this is a simplified and more modern variant of ljetronic. Were dedicated to providing you with the most robust and advanced ecu for your mazda, toyota, nissan, and custom projects. Direct petrol injection system with bosch motronic med 7 design and function selfstudy programme 253 service. I attach a description of the bosch mono jetronic system. Gregs bosch ljetronic fuel injection idle adjustment, diagnostic and tune up page, latest revision sept. First tests with manual assembly at blaupunkt failed and bosch built up its. Adaptronic is the leader in aftermarket ecus and accessories. The following diagram provides an overview of how the fuel injection components are integrated. Ljetronic fuel injection technical troubleshooting article. 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 following article discuss on ljetronic fuel injection systems for bmw e12 which covers following topics. The wiring harness plug is removed from the ecu for many of. Ljetronic fuel injection systems for bmw e12s peter florance. The k in kjetronic indicates continuous injection, and lambda indicates the inclusion of a lambda probe, or oxygen sensor on certain models. Schematic diagram of an ljetronic system with lambda closedloop control. Jetronick jetronic jetronic, or cise, which means continuous injection system, due to the mechanical fuel distributor, is the basic system used in lowerend models early on.
Direct petrol injection system with bosch motronic med 7. Bosch ke2 jetronic fuel ecu pinout measurements bentley turbo r early 89 22888 the fuel ecu is the black box above the accelerator pedal rhd cars. Chapter 3 of djetronic article series by drdjet describes function, repair and tuning of the brain of djetronic. Ke jetronic ke jetronic or cise, which means continuous injection system with electronic control is a variant on the much more basic jetronic system. Appendix b of djetronic article series by drdjet lists pinout of all ecus of all djetronic equipped cars. Attached information is only meant to give you a compact and easily readable overview of each ecu pinout. It uses the same ignition controller, but comes with a much more advanced oxygen sensor computer, and sometimes a knock sensor computer as well.
I just cut open the wiring tube a little bit from the combo relay, cut the green wirepin 15 on the combo relay, stripped the green wire on the fuse box connectorpin 4 a bit and soldered the wires together. Ecu pinout and electrical tests at the connector on april 24, 20 at 7. As i noticed, my uno have a problem with throttle position sensor, or. Note that the ecu connector is accompanied by the c104, a small 3pin plug that provides data for the instruments. Tips from richard at elektronik repair the main cause of failure in the lh jetronic fuel injection ecu is the hybrid circuit. In this unit the single pcb is surface mount on one side and leaded components on the other including two or three proprietry thick film hybrid modules. Do not try to correct engine trouble by making simple adjustments to the idle speed or the idle mixture co. Air pressure transducer apt the air pressure transducer monitors induction manifold pressura it passes this information to the relevant ecu. In the table below you can find the ecu application chart. Anyone who can speak polish, translate and publish.
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. I also got information that resetting ecu could be done for having best performance. Jetronics primitive management system only controlled fuelling, so the ecu is little more than an injection control unit. Bosch ljetronic l jetronic rx7 brought to you by the team at. 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. The bosch ljetronic fuel injection system used in the porsche 912e is often referred to as the. If the ect is replaced by the prior owner, so the ect connector has fresh conductive contact with the factory wiring not being futzed with, like cut or what have you, suspect corrosion at the ignition ecu wire harness connector. Tips from richard at elektronik repair the main cause of failure in the lhjetronic fuel injection ecu is the hybrid circuit. Bosch kejetronic continuous injection system mechanical fuel injection overview part 1of 6 fuel injection system bosch cise 1986 fuel systems mercedesbenz cise electronic control system description the fuel injection system used on. Pdf page 18 of 20 both ect wires are red blue stripe from the ect connector that quickly hides under the sheathing. The bosch djetronic electronic fuel injection system is composed of 3 major subsystems.
It is no secret that the wiring schematics for the audi s2 are notoriously hard to get your hands on. Do you have the pin function image for a bosch jetronic ecu 0280000. The ecu can self detect up to 105 different problems with itself, its wiring and its associated sensors, storing the respective code if it detects any malfunction or reading outside of pre defined acceptable limits. The djetronic electronic control unit ecu controls most aspects of the fuel injection system. Other ecu failures may rarely occur but they are much more unusual than those listed above. 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. Motronic is the trade name given to a range of digital engine control units developed by robert bosch gmbh commonly known as bosch which combined control of fuel injection and ignition in a single unit. There have been several books published that cover repair and upgrading the rest of the system, but they do not discuss the circuitry inside the ecu itself.
It has been discussed, that they are interchangeable, but for anyone searching what they might need or have, we all know that year of the bus means little compared to whats actually presently in there. Bosch ke2 jetronic fuel ecu pinout measurements bentley. Fuel injection system the ke2 jetronic fuel injection system is fitted to turbocharged engines. I added the pc board identification of the various modules that do the heavy lifting. Important the information on this page is only applicable to the aby and adurs2 engine. This code is used to indicate any late modifications which may have. An electric wiring diagram is included at the end of the manual to assist you in tracing. Please note that the output waveforms produced by the rather sophisticated compared to the tr8 ecu output current control circuity are not shown in the diagram. Wire colors may vary wire colours and pin information are extracted from edition 07. The injection function of the motronic system is based on the well tried l jetronic system, although a number of refinements have improved operation. The bosch l jetronic system has a variety of sensors designed to signal the ecu electronic control unit throughout engine operation. Mar 19, 2014 thought i would add a few of the most common ecu pinouts and wiring diagrams, as ive managed to get a pdf writer working as well as a copy of autodata. Kejetronic kejetronic or cise, which means continuous injection system with electronic control is a variant on the much more basic jetronic system.
Switched 12v supply voltage via fuel pump relay activated by ecu. Probably for burnoff assuming that pin 25 burnoff trigger is a 0v output pulse. The throttle body integrates other components that in the motronic system are scattered around the engine, like idling actuator and butterfly potentiometer, among other. The ecu was much cheaper to produce due to more modern components, and was more standardised than the ljetronic ecus. 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. Opening times determine the amount of fuel injected. Bosch ke jetronic continuous injection system mechanical fuel injection overview part 1of 6 fuel injection system bosch cise 1986 fuel systems mercedesbenz cise electronic control system description the fuel injection system used on all mercedesbenz gasoline engine vehicles uses. The djetronic electronic control unit ecu rennlist. If youve ever tried tracing the full schematic and concluded the headlights were controlled by the radio, these schematics will help a lot. L jetronic system fuel injectors n open when energized by ecu not continuous as k jetronic.
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. I was disappointed but not really surprised to find that there isnt much information available about the inner workings of the bosch l jetronic ecu used in so many cars worldwide. Looking on that ecu connector, pin 25 is on the right side where wiring. Other ecu earths are use to complete actuator and sensor circuits. This valve is mounted on the throttle body part like a carburetor. Also known as a brain or a computer, its a combination of digital circuits, analog sensor interfaces, and control circuits.
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