BMW K100 LT Bedienungsanleitung PDF herunterladen (Seite 17)

Quick explanation of the principle:

What's happening when you press the starter switch:

The starter relay and Fuel Injection relay close, Hall sensors get power.

The FI relay energizes (+) the fuel pump, the idle switch, the injectors and the air

flow meter.

The LE-Jetronic receives (pin #4) the signal that the engine is starting and it sets

itself on starting mode (enriching the air/fuel mixture)

Electronic ignition module pin # 9-10-14 send power to the ignition coil

Electronic ignition module pin #8 send engine rpm info to pin #1 of FI computer

Electronic ignition module pin #7 sends ground to the coil of the FI relay as soon

as the starter switch is depressed. The ground will stay on after the starter switch is

released as long as the Electronic ignition module receives a signal from the Hall

sensors.

Note: Under 1300rpm, the timing is set to 6 ̊. Then, the Electronic ignition module

will modify the timing according to the engine rpm.

At 8777rpm, the timing is reset back to 6 ̊.

At 8905 rpm, the fuel injection is shutdown by cutting the signal from pin #8

(Electronic ignition module) to pin #1 (LE-Jetronic) and will resume when the rpm

come back down to this value (This is to avoid over running the engine).

When engine runs over 710rpm, the Electronic ignition module shuts off the

ground to the coil of the starter relay (pin #11). (This is a higher rpm than what

the starter is capable. and at this point the Electronic ignition module assumes

that the engine is running).

If the engine stalls (no more signal from the Hall sensor), the Electronic ignition

module will shut off the ground to the FI relay and to the coils. (This is to protect

the output transistors and coils).

This is time to get your multimer (Ohm meter / Volt meter)

and start to collect values from the system.

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BMW K100 LT Bedienungsanleitung Seite 17