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AutoDoc, ASE and Ford Master
Category: Ford
Satisfied Customers: 205
Experience:  Ford Senior Master, Diesel Certified, electrical, powertrain, heating and a/c. 18 years experience.
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97 ford expedition: a diagram of fuse box , since i dont..4x4..Awd

Resolved Question:

i have a 97 ford expedition there is three problems that i am having... first i need a diagram of fuse box , since i dont have original owners manual i cannot tell one from the other, what should i do? Second the 4x4 settings consist of 2Hi, Awd, 4HI,4Lo , my question is when i activate the auto 4x4 on dash,the light for Awd comes on,but doesnt seem to ingage, not sure what to do? Third the check engine light just came on with a code po455 it says that that the evap isnt purging or there is a leak... What is and where is the evap? Also i got code po400 which is egr flow fault... What is the egr?
Submitted: 8 years ago.
Category: Ford
Expert:  AutoDoc replied 8 years ago.

HelloCustomer When you set the switch to AWD, the 4x4 does not engage until the computer senses that the rear wheels are spinning faster than the front wheels. This is the Automatic 4x4 setting. If you want the 4x4 to engage you need to put the switch to 4x4hi or 4x4lo. You can select 4x4hi at any time, but if you want 4x4lo, you need to be stopped and the vehicle needs to be in Neutral.

The P0455 code is for the evaporative emission system. This controls the vapors from the fuel tank. It is very hard to diagnose without a scan tool and a smoke machine. This will need to be done by a qualified technician in order to diagnose properly. It could be a switch, it could be a hose a solenoid. It will end up costing you less in the long run to get it repaired rather than trying to repair it yourself.

The code P0400 is for the EGR system. This is the Exhaust Gas Recirculation system. More than likely the problem is with the DPFE (Differential Pressure Feedback Exhaust) sensor. This measures the amount of exhaust gas that is recirculated into engine for emission control. The problem could be with the egr valve, plugged ports, egr control solenoid, DPFE sensor, hoses. This is also very difficult to diagnose without a scan tool because you need to be able to monitor and activate sensors. My advice is to take the vehicle in and have it either diagnosed and you can replace the parts to save some money, or have them fix it as well. Below are the pictures of both fuse boxes. The one under the hood and the one under the dash.




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