Ford Ranger Forum - Forums for Ford Ranger enthusiasts!

Go Back   Ford Ranger Forum - Forums for Ford Ranger enthusiasts! > >
Forgot Password? Join Us!

Welcome to Ford Ranger Forum

Reply
 
Thread Tools Search this Thread

  #1  
Old 11-24-2009, 08:48 AM
Silverbuell Silverbuell is offline
Learning to use the forums
 
Join Date: Aug 2009
Posts: 8
Thumbs down 99 Ranger GEM/ABS/VSS Wiring/Voltage Help

I have a 99 Ranger 2 wheel drive XLT 3.0l, electronicalyl shifted automatic trans. I recently had to replace the rear ABS/Speed sensor.

I need to test the wiring circuit from the ABS/Speed Sensor at the rear differential to the GEM module up front.

Can someone tll me the location of the GEM module?

Also, can someone tell me the what voltage is being sent by the rear ABS Sensor/VSS so I can test the low and the high outputs?

Problem I am trying to solve:
Speedomter is dead
Truck will not shift (electonically) out of 1st gear when in Drive, but can be manually shifed 1-2.

Thanks

Tim in Centreville
__________________
Tim in Fairfax VA
1999 Ford Ranger XL
Reply With Quote
  #2  
Old 11-24-2009, 09:47 AM
rwenzing rwenzing is offline
Some assembly required...
 
Join Date: Jun 2009
Posts: 890
Default

The GEM is in the dash to the left side of the radio cavity. When the ring gear is turning, a low voltage A/C signal is generated across the RD/PK and LG/BK wires, frequency proportional to speed.

For 98~00 RABS Rangers, this raw signal is used by the GEM to output a 0~12v DC square wave on the gray/black to be used by the speedometer/odometer, PCM and speed control. Again, frequency proportional to speed. The conversion factor flashed into the RABS GEM is adjustable for tire diameter to give a standard 8000 cycles/mile.

For 98~00 4WABS Rangers, a similar conversion is done by the 4WABS Module instead. In these 4WABS trucks, the GEM is an end used of the 0~12v square wave just like the speedo/odo, PCM and speed control. It is not the conversion module.
__________________
2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
Heated seats, Explorer EATC, Trip Computer and consoles

2003 XLT 2.3L M5OD-R1 reg cab, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid
Reply With Quote
  #3  
Old 11-24-2009, 09:56 AM
Silverbuell Silverbuell is offline
Learning to use the forums
 
Join Date: Aug 2009
Posts: 8
Default

Many Thanks for responding to my request. I have the Ford Ranger Service manual DVD and could not identify what voltage signal to test for, nor where the actual GEM was located. Your information is very very helpful.

WIll I need to pull the instrument cluster or radio, or can I get to it from underneath?

Tim in Centreville
__________________
Tim in Fairfax VA
1999 Ford Ranger XL
Reply With Quote
  #4  
Old 11-24-2009, 11:17 AM
rwenzing rwenzing is offline
Some assembly required...
 
Join Date: Jun 2009
Posts: 890
Default

To get to the GEM, pull the radio and the radio bezel.
__________________
2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
Heated seats, Explorer EATC, Trip Computer and consoles

2003 XLT 2.3L M5OD-R1 reg cab, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid
Reply With Quote
  #5  
Old 11-27-2009, 10:10 AM
Silverbuell Silverbuell is offline
Learning to use the forums
 
Join Date: Aug 2009
Posts: 8
Default

Rwenzing,

I am hoping you can be of further help. I verifed the ABS/VSS sensor is outputting a variable signal, confirmed the signal is reaching the GEM, and the GEM is outputting a variable signal on the gray/black wire. All fuses are good, and I even switched relays around without sucess.

The speedometer remains dead, the electronically controlled transmission will not shift out of 1st gear, and the brake pedal feel very firm (Perhaps from ABS)

Any idea's / suggestions what I can check?

Thanks, and Happy Thanksgiving

Tim in Centreville, VA
__________________
Tim in Fairfax VA
1999 Ford Ranger XL
Reply With Quote
  #6  
Old 11-27-2009, 10:54 AM
rwenzing rwenzing is offline
Some assembly required...
 
Join Date: Jun 2009
Posts: 890
Default

I would check to see if the same signal is reaching the GY/BK of the cluster and PCM pin #58. Again, the gray/black should show a 0~12v square wave when moving and the frequency should increase proportionately to vehicle speed. Frequency at 30 MPH should be about 67 Hz; 60 MPH, about 133 Hz.
__________________
2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
Heated seats, Explorer EATC, Trip Computer and consoles

2003 XLT 2.3L M5OD-R1 reg cab, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid
Reply With Quote
  #7  
Old 11-30-2009, 10:12 AM
Silverbuell Silverbuell is offline
Learning to use the forums
 
Join Date: Aug 2009
Posts: 8
Default

rwinzeng,

Thanks for all your help. Your knowledge of the electrical system is incredible. I've decided not to pull the instrument cluster to conduct futher tests. I'm going to take it to my local Ford dealer (who has an excellant reputation) hoping they have seen this before and can effect an efficiant repair.

Tim in Centreville
99 Ford Ranger
05 Dodge Magnum R&
98 Buell S3T
__________________
Tim in Fairfax VA
1999 Ford Ranger XL
Reply With Quote
  #8  
Old 12-16-2009, 09:43 AM
Silverbuell Silverbuell is offline
Learning to use the forums
 
Join Date: Aug 2009
Posts: 8
Default

All,

I am pleased that the Ford dealer was quickly able to repair my Ranger. The problem was the ABS?VSS replacement I had purchased from Advanced Auto Parts.

I've always used OEM parts for these types of repairs, and looking back I don;t know why I used an aftermarket part.

In the future I'll stick to Ford parts!

Many thanks to rwenzing for his knowledgable assistance.

Tim in Centreville (glad ot be back on the road again!)
__________________
Tim in Fairfax VA
1999 Ford Ranger XL
Reply With Quote
  #9  
Old 12-16-2009, 04:29 PM
modelageek modelageek is offline
Ford Ranger Driver
 
Join Date: Jan 2009
Posts: 6,257
Default

That was very interesting
__________________
2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
Reply With Quote
  #10  
Old 04-08-2012, 07:01 AM
mmercadovelez mmercadovelez is offline
Learning to use the forums
 
Join Date: Dec 2010
Posts: 2
Unhappy Re: 99 Ranger GEM/ABS/VSS Wiring/Voltage Help

I have a Ford Ranger XLT 1999 and seems that my GEM is bad. Windows, wipers and dome light is not working. Cjeck all fuses and are o.k. Is the Generic Electric Module the same on a 2WD and a 4WD ?

thanks
Reply With Quote
  #11  
Old 04-08-2012, 09:09 AM
rwenzing rwenzing is offline
Some assembly required...
 
Join Date: Jun 2009
Posts: 890
Default Re: 99 Ranger GEM/ABS/VSS Wiring/Voltage Help

2WD and 4WD are different.
__________________
2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
Heated seats, Explorer EATC, Trip Computer and consoles

2003 XLT 2.3L M5OD-R1 reg cab, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid
Reply With Quote
  #12  
Old 04-09-2012, 03:36 AM
mmercadovelez mmercadovelez is offline
Learning to use the forums
 
Join Date: Dec 2010
Posts: 2
Smile Re: 99 Ranger GEM/ABS/VSS Wiring/Voltage Help

Thanks for the info...
Reply With Quote
  #13  
Old 04-09-2012, 08:24 PM
rwenzing rwenzing is offline
Some assembly required...
 
Join Date: Jun 2009
Posts: 890
Default Re: 99 Ranger GEM/ABS/VSS Wiring/Voltage Help

Manuel-

Before spending the money on another GEM, you might try reinitializing yours.

After working on some wiring inside the dash of my Ranger, I saw a similar set of symptoms from my GEM and thought it had been damaged. After I powered it down for a few minutes, it began working correctly again and has been fine ever since.

To reset the GEM in a 99 Ranger, try pulling dash fuse #25 and then reinstalling it.
__________________
2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
Heated seats, Explorer EATC, Trip Computer and consoles

2003 XLT 2.3L M5OD-R1 reg cab, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid
Reply With Quote
  #14  
Old 04-09-2012, 08:29 PM
PHAL23 PHAL23 is offline
Ranger Gang
 
Join Date: Mar 2012
Posts: 679
Default

My wipers didnt work in my 05, have manual windows. Turns out i blew the accessory run fuse. My radio didnt work either. I changed that it it was good as new. Thought i needed a gem as well
__________________
2005 Ford Ranger Edge 4x4
3.0L, Air box mod, Torsion Cranked, 2" Leaf Blocks, 31x10.50-R15's on American Racing Wheels, Tinted Windows, 10in Pioneer Sub w/ 250watt Rockford Fosgate Amp
Reply With Quote
  #15  
Old 06-04-2012, 11:35 AM
Mchambe77 Mchambe77 is offline
Liking the Ford Ranger Forum
 
Join Date: May 2012
Posts: 25
Default Re: 99 Ranger GEM/ABS/VSS Wiring/Voltage Help

I have a 99 3.0 that I am trying to get running. I have no radio interrior lights or bell ding and it wont start could this be the GEM?? Or any other suggestions?? I have a new battery and all fusses and relays are good.
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Where Can I Get A Free Diagram For Car Stereo Wiring In A 2004 Ford Ranger.? JULIAN X Audio / Video 4 08-08-2010 06:24 PM
AC compressor not getting voltage ranger93 General Ford Ranger Discussion 0 06-26-2009 06:49 AM
Low Voltage on EGR rem General Ford Ranger Discussion 0 05-06-2009 05:19 PM
2008 Ford Ranger Towing Hitch T-Connector Wiring Kit? Scottyman2002 General Ford Ranger Discussion 1 01-22-2009 05:51 PM
Wiring a radio in a 1974 Ford Ranger? ?love_beach_forever? Electrical Tech 1 12-02-2008 06:29 PM