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Test the LH2.2 and EZK117 without OBD???

Hallow One of user alt.autos.volvo has written,..that is one method to check egnition systems in Volvo 740 witchout OBD with using the LED and connect to same connector and observed it while driving a car. Anybody know something about this?? How to cionnect this? and how LED must to use?

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sq1euo
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LED long leg is cathode, short leg is anode. Solder load resistor on cathode (K) side. For automotive use 1KOhm is always safe. If you find some peculiar LED then refer here:

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to quickly calculate the load resistor value.If you connect the + cable to the g/w wire in the other free connector, the light will flash in a steady beat when the control unit is successful in attaining lambda. The on-off cycle of the LED will correspond exactly to the sweep of your volt meter. Bob

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