my 98 ranger xlt 4wd wont engage - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

mmcnemar · 12-28-2009, 07:15

i apologize ahead of time for not knowing much about the vehicle but its my first 4wd...when i try to engage the electronic 4wd my 4hi or 4low lights on the dash wont even turn on...no "clunking" no noises no nothing, any suggestions???

**360ci** · 01-24-2010, 18:15

TCCM isn't working. I know this is an older post and if you haven't solved the problem, it's quite common for the Transfer Case Control Module to fail. Their useful life is around 6-10 years. Best bet is to pick up a used one from a vehicle with low miles that fits your application: RockAuto Auto Parts The TCCM is what controls the drive selection. If you had a manual transfer case with a lever on the floor, the TCCM is what changes drive modes on your behalf. It would be worth a professional diagnosis of course.

847alexc · 02-10-2010, 18:35

I might also remind you, though you are probably already aware, that there is a speed sensor at the back end of the transfer case which prevents engagement above a certain speed. for 4-low, you should have the car in neutral and parking brake set for it to engage. it sounds ridiculous, but its free to try before spending any money.

**360ci** · 02-10-2010, 19:08

Quote:

Originally Posted by 847alexc

I might also remind you, though you are probably already aware, that there is a speed sensor at the back end of the transfer case which prevents engagement above a certain speed. for 4-low, you should have the car in neutral and parking brake set for it to engage. it sounds ridiculous, but its free to try before spending any money.

I have nothing on the back end of my transfercase (Dodge) but it's a full time unit. I'd think if the transfer case is electronically controlled, the PCM would stop the TCCm from switching drive modes above a set speed. I'm not sure about part time units, but for a sensor to be on the transfer case itself that controls speed, I think this would be difficult as true speed won't be realized except through rpm, which it would have to calculate what gear the transmission is in. This would make be believe that the PCM is controlling the unit, or at least setting the parameters. Could always pick up a Haynes repair manual I suppose to find out for sure.

**Bert** · 02-10-2010, 19:30

Transfer Case Troubleshooting - The Ranger Station