Wiring

2002 FORD EXPEDITION
150,000 MILES • V8 • 4WD • AUTOMATIC
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THUMPIN
  • MEMBER
  • 2 POSTS
fuel pump not running on 2002 expedition. relay and fuse are good still no power to pump
Dec 18, 2010 at 9:08 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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THUMPIN
  • MEMBER
  • 2 POSTS
I have checked the inertia switch. There seems to be power to the relay and to the coil on the relay but there is some kind of funky switched ground or something.
Dec 18, 2010 at 9:10 PM
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DOCFIXIT
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 18,828 POSTS
Yes ECM grounds check fuel pressure can hear pump run? check for spark was check engine light on?
Dec 18, 2010 at 10:13 PM
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MJR346
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 132 POSTS
On this model, are you getting power to the engine computer? the relay is controlled by the PCM and once it grounds inside the PCM it delivers power to the inertia switch and ultimately to the fuel pump. You should have voltage only for two seconds when turning the key on or while cranking, checking any other time will give you false readings.
Dec 19, 2010 at 7:36 PM