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lucittm lucittm is offline
Manassas, VA
 
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Join Date: Apr 2007
Posts: 1,210
Garage
Fuel Pumps

Our cars have a "safety feature" that prevents the fuel pumps from running if the airbag deploys. This is accomplished by removing the +12V from pin 7 (terminal 86) of the fuel pump relay coil. You can test this by connecting a voltmeter from pin 7 of the relay receptacle to ground, you should get +12V when the key is in the on position, you are getting battery voltage, so that is good. If there was no voltage, I'd check connector pin 18 (black wire with a white stripe) coming from the Airbag Control Unit behind the instrument panel.

The other side of the relay coil gets its ground from the Turbocharger Control Unit (P/N 965-618-130-00) under the driver's seat. If you are not getting a solid ground on the #6 terminal of the 6-terminal plug under the driver's seat with the key in the on position, you may need a new control unit. The ground signal originates on the intercooler and goes through the overboost switch on its way to the control unit. I would check there first. But based on your description, you may have caused a surge that fried your turbo control unit since it is connected directly to the battery on connector pin 6 of the control unit. 40 amps is a lot of amperage. You should stick with a 10-12 amp charger.

Mark
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1991 964 Polar Silver Metallic Turbo Coupe

Last edited by lucittm; 09-14-2009 at 05:42 PM..
Old 09-14-2009, 05:37 PM
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