4WD not working

[kab9200]

I have a 2001 Mazda B3000. The 4WD quit working. When I turn the switch on the dash nothing happens. No click, no dash light - nothing. It appears to me to be electrical but I am not sure. I searched the forum but was not able to find a thread regarding this. I am hoping someone can point me in the right direction for troubleshooting.

 

[Uncle Gump]

Several transfer case diagnostics here...

Transmission, Transfer Case & Driveshaft - The Ranger Station

DISCLAIMER: Activities and vehicle modifications appearing or described at The Ranger Station and it’s pages may be potentially dangerous. We do not endorse any such activity for others or recommend it to any particular person – we simply describe … Continued

www.therangerstation.com

 

[kab9200]

Thanks. I will check it out.

 

[Josh B]

At this stage I would expect, or at least hope it could be something simple. If yours is an automatic (push button) shifter it may be as simple as pulling the shift motor and cleaning it up, like an old starter or something, just needs a bit of attention

 

[rubydist]

In that generation, the shift motor is the most likely culprit, but as the troubleshooting describes, there are several other candidates.

 

[RonD]

Welcome to TRS

1983-1994 Rangers use a 4WD controller located behind drivers seat
1995-2000 Rangers/B-Series used GEM module as controller, in the dash
2001-2003 Rangers/B-Series used 4x4CM located behind passenger kick panel
2004-2011 Rangers/B-Series used 4x4CM located in dash next to the radio


2001 -2005 Ranger/B-series 4x4s used the 1st generation 4x4CM
And these failed often
Sign of that is no "Click" heard in the cab when you change 4WD selection

In 2001 its located behind the passenger side kick panel, seen here: https://www.therangerstation.com/Magazine/spring2017/transfer_case_troubleshooting/transfer_case_troubleshooting-9.JPG

4x4CM should "click" to activate the shift motor
FIRST check Cab Fuses 5(15amp) and 10(7.5amp), they power the 4x4CM

Also check fuse 13 in the Engine fuse box, it powers the shift motor, but not the dash lights or the "click", those are 4x4CM functions

If you hear a "click" when you change 4WD selection then yes, shift motor would be the place to start

I checked 2001 Ranger and 2001 B-series owners manuals and the fuse numbers/purpose are the same

You can unplug the 4x4CM and test for 12v and ground, but that's about it

The dash switches never fail, unless physically damaged its just 3 resistors

2006-2011 used 2nd generation 4x4CM which was better but NOT backwards compatible to 2001-2005 Ranger/B-series

 

[Josh B]

Save this ^^^ for future reference
Welcome to TRS man, and good luck with it

 

[kab9200]

Thanks for the help everyone! This gives me a great road map for troubleshooting. This will be my weekend project.