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project update? 200

uid 27's pic
posted by  Art Benstein on  Thu Apr 16 13:53 CST 2009
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last visit: Fri Oct 17 20:10 CST 2014
[RELATED]

Hi Charles,

The system relay comes on with the ignition switch. The relay is controlled by a "ground" applied by the ECU at pin 21 when it sees ignition-switched battery at pin 18, and continues for a few seconds after the ignition is switched off.

In the LH2.0, the pump relay does not come on until you crank and the ECU sees ignition pulses arriving at its pin 1. That causes a "ground" to be applied to ECU pin 17, allowing the fuel pump relay coil to be energized by the voltage supplied by the same path that feeds ECU pin 18.


--
Art Benstein near Baltimore

Maybe it's true that life begins at fifty... but everything else starts to wear out, fall out, or spread out. - Phyllis Diller






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New I think the problem has reared it's ugly head! The latest dilemma on my project [200]
posted by  volvo245kit  on Tue Apr 14 11:31 CST 2009 >


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