4WD not working


RonD

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There is only 2 parts to the system, the 4x4 CM, you just changed, and the shift motor

And the 4WD light will flash if 4x4CM sends the shift motor voltage(relay clicks) and shift motor doesn't move.

The switch is just 3 resistors and the 4WD Lights should flash if 4x4CM doesn't get back any voltage from switch when key is turned on

4x4CM sends 5volts to switch with key on, these are the voltage readings the 4x4CM will get back from switch
3.86v for 2wd
2.94v for high
1.76v for low
If 4x4CM gets no voltage then it would flash 4WD lights

This is not a complicated system, compared to some, lol

I think your "new" 4x4CM is bad, especially if its not "clicking"
Not unheard of

Whats the part number on it?

I am showing last part number for Ranger 4x4CM was 8L5Z-7E453-A, so a 2008 number, previous was 7L5Z-7E453-A so 2007 number
 


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ochoam

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Part number is 8L5Z-7E453-A

I would be very surprised if this part was back I got it from a good ford dealer

I am going to call where I got the part from, but I'm worried there's no way to test if the part is bad.
 

ochoam

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Talked with a mechanic I trust about this (not saying I don't trust this form, but he has been great to me in the past)

When he did other work on the car he thought the part could of been bad too.

To prove the part is defective from where I bought it they'd charge me for labor, and I want avoid that.

Do you have to initialize this part?
 

RonD

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No, the part is plug and play.

You did say you checked the 3 fuses after putting the new part in, right
 
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ochoam

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Correct I did
 

ochoam

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Good news, I got it fixed.

I did need to unplug the battery for 10 minutes to 'initialize' the module.
 

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RonD

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Good work

Never heard of that but good to know
 


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