There is a black plastic cover that has to be pulled turn off of the yes, really fuse box.

You are watching: 2003 ford expedition pcm relay location

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I checked fuse #34 with the vital on and it had actually power and was great so that eliminated a faulty pcm relay and related wiring. The next step to be to find the irradiate blue/orange cable in cavity #12 of the C270B connector. That is in the reduced right hand corner of the twelve cavity connector just listed below the connector that ns am backprobing in the picture above. Once the ignition is turned on the reading was near zero volts and after a couple of seconds it went to battery voltage. This said me that the pcm was using a ground come energize the fuel pump relay coil. With every one of this testing I knew without a doubt that the fuel pump relay that is part of the inner fuse box was faulty.

Disconnect the battery an initial before removed the fuse block. There is a battery feed cable that likewise has to be disconnected top top the rear edge that the fuse box. That is located under a cover. I have pictures of that at the end of this post. Over there is only one bolt that holds this fuse block in place.

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In the rear.

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The fuse block gotten rid of from the vehicle. You deserve to see the battery terminal short article on the lower left edge.

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I took the ago cover off of the fuse block and also started disassembling it.

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The damage was even simpler to check out from the relay next of the board. Ns feel relatively confident the if this trouble would have actually been recorded soon enough, the solder joint could have to be repaired or a brand-new relay set up (if one might have to be located).

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I plugged everything earlier in and also bolted the fuse block in place.

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The cover because that the battery stud top top the fuse block.

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I put every one of the covers back on, clearing the codes and test journey the vehicle. This one is done.

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This repair will certainly generally apply to Ford and Lincoln full sized trucks and suv’s in the very same years//body style. Check diagrams and component locators before jumping any type of circuits, together I did.