Posting this up as I thought it may be helpful to somebody sooner or later...
My '01 Trooper lit up the ABS light recently. The light was on almost all the time (would go out briefly once in a while).
First I checked both the 15 and 40 AMP fuses (both OK). Then I inspected all the wiring that I could get to for the front and rear wheel sensors. I didn't find any shorts or other problems. Next I shorted pin 12 to ground (pin 4) on the OBD-II connector using a paperclip. The ABS light flashes displaying code 12 (Self Test Working System OK) and code 43 (RF Holding Solenoid open/shorted). Note: If you have never done this before (I hadn't) it displays each code three times (12, 12, 12, 43, 43, 43).
I pulled the connector off the EBCU and everything was in great shape (no corrosion etc.) I cleaned it out anyway with some electronic contact cleaner and blew out both sides of the connector with some compressed air (no change).
So looks like maybe the wiring to the RF solenoid fried in the EBCU (the electrical half of the ABS unit under the hood behind the right headlight).
I contacted Jerry to inquire about a new ABS uint. Jerry informed me that they are about $2600 wholesale :shock: He recommended going with a used one from a boneyard. I checked a number of local yards. There are quite a few ABS units available at all sorts of prices (average price is about $125). The only problem is that a used one is most likely going to fail like my existing one sooner or later (hopefully later).
I then decided to google "ABS repairs". At least two shops came up that repair ABS units. I looked over a couple of websites and decided to call Module Masters http://www.modulemaster.com. Based on the information on their website the unit in my '01 Trooper is a Bosch 5.4 unit. I spoke to the folks at Module Master told them what unit I had (Bosch 5.4), the error code (43) and the vehicle.
They stated that they could most likely fix it but probably not test it (different electrical connector that they aren't setup for). They said ship it to us and we will inspect it. If we can't fix it you don't pay any bench time only shipping both ways. If they can fix it they would charge me $160 plus return shipping and if it didn't work (assuming they couldn't test it) they would refund all my money less shipping if I still had the problem.
I figured this was a no brainer. Shipped my unit out to them. They got it on a Thursday afternoon. They called me back Monday morning and said it is all done. Price was $177 ($160 for the repairs with a 5 year warranty and $17 for 2 day return shipping).
Got the unit back and it works perfectly. So if you come across problems with your ABS unit you may want to give Module Masters your business. They were really outstanding to deal with. Easy to get on the phone, helpful, reasonable cost, fast service and very generous warranty.
I have no affiliation with Module Masters other than I'm a very satisfied customer. If you run into ABS problems, repair may be an option depending on the issue.
My '01 Trooper lit up the ABS light recently. The light was on almost all the time (would go out briefly once in a while).
First I checked both the 15 and 40 AMP fuses (both OK). Then I inspected all the wiring that I could get to for the front and rear wheel sensors. I didn't find any shorts or other problems. Next I shorted pin 12 to ground (pin 4) on the OBD-II connector using a paperclip. The ABS light flashes displaying code 12 (Self Test Working System OK) and code 43 (RF Holding Solenoid open/shorted). Note: If you have never done this before (I hadn't) it displays each code three times (12, 12, 12, 43, 43, 43).
I pulled the connector off the EBCU and everything was in great shape (no corrosion etc.) I cleaned it out anyway with some electronic contact cleaner and blew out both sides of the connector with some compressed air (no change).
So looks like maybe the wiring to the RF solenoid fried in the EBCU (the electrical half of the ABS unit under the hood behind the right headlight).
I contacted Jerry to inquire about a new ABS uint. Jerry informed me that they are about $2600 wholesale :shock: He recommended going with a used one from a boneyard. I checked a number of local yards. There are quite a few ABS units available at all sorts of prices (average price is about $125). The only problem is that a used one is most likely going to fail like my existing one sooner or later (hopefully later).
I then decided to google "ABS repairs". At least two shops came up that repair ABS units. I looked over a couple of websites and decided to call Module Masters http://www.modulemaster.com. Based on the information on their website the unit in my '01 Trooper is a Bosch 5.4 unit. I spoke to the folks at Module Master told them what unit I had (Bosch 5.4), the error code (43) and the vehicle.
They stated that they could most likely fix it but probably not test it (different electrical connector that they aren't setup for). They said ship it to us and we will inspect it. If we can't fix it you don't pay any bench time only shipping both ways. If they can fix it they would charge me $160 plus return shipping and if it didn't work (assuming they couldn't test it) they would refund all my money less shipping if I still had the problem.
I figured this was a no brainer. Shipped my unit out to them. They got it on a Thursday afternoon. They called me back Monday morning and said it is all done. Price was $177 ($160 for the repairs with a 5 year warranty and $17 for 2 day return shipping).
Got the unit back and it works perfectly. So if you come across problems with your ABS unit you may want to give Module Masters your business. They were really outstanding to deal with. Easy to get on the phone, helpful, reasonable cost, fast service and very generous warranty.
I have no affiliation with Module Masters other than I'm a very satisfied customer. If you run into ABS problems, repair may be an option depending on the issue.