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NEW post car dies kill switch style 900

posted by  spook on  Thu Jun 15 15:44 CST 2017
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last visit: Fri Oct 24 08:06 CST 2014
[RELATED]

Dear volvitowagon,

Hope you're well. I suspect the ignition switch. When the ignition switch fails: (a) not even the emergency blinkers will come on; (b) all instrument cluster warning lamps are "out". In short, when an ignition switch fails, all electrical systems are "dead".

A failed crank position sensor will not cut power to the entire car. Via the engine control unit, the crank position sensor's signal allows the fuel pump to run. When the engine stops turning or when the crank position sensor's signal is lost, the fuel pump shuts down.

Cutting power to the fuel pump is a safety feaure: if a collision cuts a fuel line and stops the engine, the loss of the crank sensor's signal prevents the fuel pump from pushing fuel through the cut fuel line. This reduces after-collision fire risk.

Hope this helps.

Yours faithfully,

Spook






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