BMW K100 LT- User Manual

BMW K100 LT

BMW K100 LT– User Manual, read for free online in PDF format. We hope this helps you resolve any issues you may have. If you have further questions, please contact us through the contact form.

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Table of Contents:

  • Page 3 – Layout of electrical components (in the tray under the tank).
  • Page 4 – Is the starter turning?; Here is a simplify schematic of the starter circuit
  • Page 5 – If the engine is cranking, continue with this chart.
  • Page 6 – major factors influence the EFI computer:; Air flow detected by the air flow; Other data collected by the EFI computer are:; Air temperature, Water; Following is a listing of the basic components and functions of
  • Page 7 – Fuel pressure regulator:
  • Page 8 – Idle switch
  • Page 9 – it's really the pump and fuel pressure; . The ECU regulates how much fuel is sprayed in by controlling
  • Page 10 – THERE IS NO SUCH THING AS A REBUILT LE-JETRONIC INJECTOR!; Air flow meter
  • Page 11 – it is the
  • Page 13 – EFI and Electronic ignition components:
  • Page 16 – Or if you prefer, this simplified schematic of the wiring:
  • Page 17 – Quick explanation of the principle:; What's happening when you press the starter switch:; and start to collect values from the system.
  • Page 18 – Water temperature sensor:; read when testing it.; necessary to test both units.
  • Page 19 – Electronic ignition module test:
  • Page 20 – WARNING: On the next test, never substitute the LED for a; The excess current drained by a bulb would burn the sensor; Layout of the Hall sensors:
  • Page 21 – Here is how to test the sensors.; Ignition coils, ignition wires and spark plugs:; First, let’s get a little bit of boring theory about coils....
  • Page 22 – The actual spark is generated when the breaker contacts; open; Much smaller coils are used
  • Page 23 – Spark plugs and ignition wires:; non resistor wires and caps; The term spark plug heat range; refers to the speed with which the plug can transfer
  • Page 24 – Electronic Fuel Injection .; the testing has to be done:; Electronic Fuel Injection module (female connector)
  • Page 25 – Testing the airflow meter:
  • Page 26 – Test of the air temperature sensor in the air flow meter:; Here is how the thermi-resistor is tested:
  • Page 27 – Testing the electrical power at the fuel injectors:; it is best is to use an LED
  • Page 28 – Here is where you test for power at the fuel injectors:
  • Page 29 – Testing the fuel pressure; Testing the pump pressure
  • Page 30 – If you are; For other information on the K100, you also be interested to
Loading the manual

EFI/Electronic ignition K100 2v

troubleshooting

Disclaimer:

This page is a guide but not a reference. I am not a professional but

only a K100 enthusiast with good knowledge of the bike.

Most of the information contained is this document was not available

anywhere on the Internet at the time this guide was written. After a

couple of month of research, I finally compiled this printable version.

The HTML version posted on the

K100 forum

has been viewed 5,000

times in 5 months. From all the feedback received, the information

published has been confirmed to be accurate.

Please use your own judgement when testing the electronic as I

CANNOT be responsible if you short or fry an electronic component.

This is an on going project and this file will be upgraded when new

information will be available. Please check it regularly.

Bertrand Vogel (Crazy frog)

This document should help you to understand how the LE-Jetronic and the electronic

ignition are working.

I would happily add your comments and experience to this page if they are relevant.

Click here to email me additional information

You don't need electronic knowledge but basic electrical knowledge

in order to test both units following the information on this page.

The following explanations and schematics are specific to the early K100 2 valves.

The 4 valves RS is different (Motronic) but the same principle applies to it.

The K75 shares the same technology and the principle is similar at the exception of an extra

coil.

First, you have done all the basic troubleshooting such as: checking the fuses, ignition

switch, kill switch, side stand switch (not applicable on early K100), transmission in

neutral, clutch in, starter connection, Fuel pump connector on the fuel tank, and battery

connections.

The ground connections are critical for the electrical system. The ground connection

between the battery (-) and the side of the transmission should be cleaned and tested.

the connection #9 on the frame should also be checked. (Remove the screw and clean

all the connectors)

Most of the starting failures are related to a corroded ground connector!

"Loading the manual" means you need to wait until the file loads and becomes available for online reading. Some manuals are very large, and the time they take to appear depends on your internet speed.

Summary

Page 3 - Layout of electrical components (in the tray under the tank).

Layout of electrical components (in the tray under the tank).

Page 4 - Is the starter turning?; Here is a simplify schematic of the starter circuit

Now, let’s start the troubleshooting….. Is the starter turning? Here is a simplify schematic of the starter circuit

Page 5 - If the engine is cranking, continue with this chart.

If the engine is cranking, continue with this chart.

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