There is a black plastic cover that has to be pulled off of the actual fuse box.

You are watching: Fuel pump relay 2003 ford expedition

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I checked fuse #34 through the vital on and also it had actually power and was great so that got rid of 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. The is in the lower right hand edge of the twelve cavity connector just listed below the connector that i am backprobing in the picture above. As soon as the ignition is turn on the reading was close to zero volts and also after a couple of seconds it checked out battery voltage. This called me that the pcm was making use of a ground to energize the fuel pump relay coil. With all of this experimentation I knew there is no a doubt the the fuel pump relay that is part of the internal fuse crate was faulty.

Disconnect the battery first before removing the fuse block. There is a battery feeding cable that additionally has to be disconnected on the behind edge the the fuse box. The is located under a cover. I have pictures of the at the end of this post. Over there is only one bolt the holds this fuse block in place.

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In the rear.

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The fuse block removed from the vehicle. You have the right to see the battery terminal post on the lower left edge.

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I took the earlier cover turn off of the fuse block and started disassembling it.

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The damages was even simpler to watch from the relay side of the board. Ns feel reasonably confident that if this problem would have been caught soon enough, the solder joint can have been repaired or a new relay installed (if one could have to be located).

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

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The cover for the battery stud on the fuse block.

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I put all of the covers ago 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 also Lincoln complete sized trucks and also suv’s in the exact same years//body style. Inspect diagrams and component locators before jumping any kind of circuits, as I did.