OBD II computer


Asked by Sep 07, 2016 at 07:54 PM about the 2004 Ford Explorer Sport Trac XLS 4WD Crew Cab

Question type: Maintenance & Repair

My 2004 Ford Explorer Sport Trac
OBD II won't communicate with
the computer. I turn the ignition on
go to the start position and
nothing happens. I have no fuel at
the Schrader valve. I can get the
engine  to roll over using the
starter relay. The theft light
doesn't blink rapidly. I'm lost and
need to get my truck back on the
road if anybody could help it
would be greatly appreciated.

5 Answers


First check for blown fuses in both boxes, and use a test light or remove then one at a time and run a continunity test on each one, if that checks good then the relays are next. On the security system, make sure the light is off, if it is on steady then the system is is lock down and it won't start until it is turned off. That procedure is listed in the owners manual.

1 out of 1 people think this is helpful.

Checked fuses and relays. The light blink when the ignition is off but shuts off when I turn ignition on. That's why we're stumped


That's what mine does and when you arm it it glows steady. So it sounds like it is operating properly. It is likely that the ignition switch just maybe bad. Have you tried removing it and see if you can get it to crank by moving it to the crank position by hand?


Not yet I'll try that. Mine doesn't have a regular alarm system. It has the passive anti-theft system


Passive systems, they seem to foul up a lot, you might think about removing it and solder and shrink wrap the joints, then you back to stock.

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