BMW K100 LT Bedienungsanleitung PDF herunterladen (Seite 27)

Testing the electrical power at the fuel injectors:

Because of the injection time varying from 1.5ms to 9ms., it is best is to use an LED

to test the EFI computer output. A cheap regular LED should work for this purpose

but they are rated for 3.3v/20mA. A resistance would have to be installed in series

with the LED in order to drop the voltage to 3.3 volts. At some hobby stores (Radio

Shack, The Source..) you are able to buy 12V LED and with them, the resistor won't

be needed. The following schematic shows the testing at the fuel injectors.

(Red/Green and Yellow/Green are the 2 wires feeding each injector)

Testing the coil of the fuel injector

Testing if the Fuel injector relay provides a positive voltage to the injector:

The positive should be permanent as long as the ignition is ON, the kill switch is on

the "running" position and the starter button is pressed.

The positive connection to the injectors is also feeding the airflow meter, the idle

switch and the fuel pump. If you get a low voltage, disconnect these 3 devices and the

FI computer. If one is bad it can drain the voltage. If you get the 12 volts, plug

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BMW K100 LT Bedienungsanleitung Seite 27