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Wiring

Tiny
THUMPIN
  • MEMBER
  • 2002 FORD EXPEDITION
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
Fuel pump not running on 2002 expedition. Relay and fuse are good still no power to pump
Saturday, December 18th, 2010 AT 9:08 PM

3 Replies

Tiny
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.
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Saturday, December 18th, 2010 AT 9:10 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Yes ECM grounds check fuel pressure can hear pump run? Check for spark was check engine light on?
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Saturday, December 18th, 2010 AT 10:13 PM
Tiny
MJR346
  • MECHANIC
  • 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.
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Sunday, December 19th, 2010 AT 7:36 PM

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