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Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23001
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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No 4x4, 2002 explorer, yes, would like wiring diagram for

Customer Question

no 4x4
JA: What is the make/model/year of your car?
Customer: 2002 explorer
JA: Are you fixing your Explorer yourself? What have you tried so far?
Customer: yes
JA: Anything else you want the mechanic to know before I connect you?
Customer: would like wiring diagram for 4x4 system
JA: Have you checked the vehicle's manual?
Customer: yes no blown fuses
Submitted: 1 month ago.
Category: Ford
Expert:  Jared D replied 1 month ago.

Hi,

So the 4wd isn't working? Which wiring diagrams would be most helpful?

What seems to be not engaging correctly?

Customer: replied 1 month ago.
4x4 buttons knot working no commu. with 4x4 module with scanner
Expert:  Jared D replied 1 month ago.

There are two options on this year model of explorer. Ford is notorious for their half-year changes. If your explorer still has the white build date sticker on the driver door jamb can you tell me the month/year of manufacture on there?

Customer: replied 1 month ago.
I have checked fuses and connections date 2 /2002
Expert:  Jared D replied 1 month ago.

Ok, so that's early build. The most common problem on that model is the 4wd control unit. Is yours automatic or manual transmission?

Expert:  Jared D replied 1 month ago.
Verify good power and ground inputs to the 4WD control module (the module is mounted on the blower motor housing under the passenger side of the dash). The Orange wire on the module that the wiring diagram shows as hot in start is only used on manual transmission vehicles. There is no connection between this wire and the fuse with automatic transmission.

If power and ground inputs are OK, the module has very likely failed. The control modules have an extremely high failure rate.
Customer: replied 1 month ago.
automatic 4x4 module has been replaced
Expert:  Jared D replied 1 month ago.

Are you getting a good ground at the transfer case?

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