4x4 not engaging, and no "4x4" light - Page 2 - Ranger-Forums - The Ultimate Ford Ranger Resource

Drivetrain Tech General discussion of drivetrain for the Ford Ranger.

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Old 01-07-2008
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Found the problem.
I went to a garage today that my dad recommended me to, the guy said to try disconnecting the battery to reset the ecu and junk. So I disconnected the battery for a while and tried the 4x4 again and nothing happened. Rudy (rudeman85) came over so I decided to try his 4x4CM in mine again and it worked! So my 4x4 control module is bad.
Other than that, my xfer case is bad too. I hot wired the xfer motor to engage it into 4Low, and it just grinds inside and sounds really bad.
My dad may have connections to get a xfer case and he's gonna check out about the control module also.
Where is a good place to get a 4x4CM? I'm gonna call around to some salvage yards tomorrow.
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Old 01-07-2008
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Glad to see that you figured it out.
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Old 01-14-2014
Join Date: Jan 2014
Location: templeton ca
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Originally Posted by n3elz View Post
Yes, but it's more likely something else. There are two relays that are used when you shift.

One relay engages a solenoid the pulls in a clutch to get the front axle moving before the "hard" engagement happens from the motor. The other relay kicks in the motor to move the system. Once you are in 4 HI by the motor, the solenoid releases. The solenoid is activated by the brown wire that goes directly into the transfer case. On AWD transfer cases, the brown wire controls the modulating clutch in the transfer case for torque control.

Hard to say if that's just one relay or both. You might still have a good motor. If you read that write up they tell you what wires go to the motor and you can try driving the motor directly with 12 volts to see what happens. Disconnect the wiring harness to the truck first though.

A blown fuse for the motor power circuit, or similar problem would also cause those symptoms. The controllers have separate power feeds for the logic board and the power to activate the motor/solenoids.

Attached are the schematics of your control system if that helps.
Where are those relays located? Are they in the junction box? If so which location number?
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Old 10-11-2017
Join Date: Jun 2016
Location: Washington
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So what's your best guess?

I'm kind of lost, so please clarify. My Ranger will not go into 4WD. When I switch the dash switch to 4H or 4L, no lights come on, but when I start the truck, the 4WD lights on the dash do come on for a second. What would be your best guess on the most likely causes for these symptoms, and what would you suggest I try first, second, etc? Thank you very much!
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