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Old 08-02-2012, 11:47 AM   #1
chewbakarox
Scooby Specialist
 
Member#: 25478
Join Date: Oct 2002
Chapter/Region: SCIC
Location: I fart 15 psi.
Vehicle:
2003 WRX Sport Wagon
PSM

Default Testing Fuel Pump for Power

I'm having trouble starting my car and have narrowed it down to the fuel pump (SEE THREAD). I want to determine if it's a mechanical issue with the pump or an electrical issue. Before I replace the pump I wanted to test at various places along the fuel pump circuit.

I found the following wiring diagram for my '03 (LINK). My assumption is that I should start at the FP assembly, then move to the FP controller, then the FP relay, then the ECU. Wouldn't that be the best process of elimination?

Also, how would I test each item with my multimeter? Am I just checking for 12V when I crank the engine, or do I need to check resistance? I'm a newbie with the multimeter. TIA.
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