Interchageable??
Thread Starter
|
Cross-Country
Joined: Sep 2018
Posts: 64
Likes: 1
Interchageable??
My truck is a 2008 F250 SD 5.4L auto 4WD. I have a problem with the transfer case module that I posted about earlier. I can get a module but slightly different number. Mine is 7C3T-14B205-AA. I found one locally but it is out of a 2008 F350 diesel 4 wd. The number is 8C3T-14B205-AB. Will it work in my truck? I am out $150 ordering from out of town so not keen on ordering another.
There is only one wiring diagram for the 2008 F250 SD 4WD and both of those boards are used in the truck so the pinouts must be the same. Likely just a difference in programming. Does anyone out there know what the difference in the two versions is and will it work in my truck?
Thanks for any advice
There is only one wiring diagram for the 2008 F250 SD 4WD and both of those boards are used in the truck so the pinouts must be the same. Likely just a difference in programming. Does anyone out there know what the difference in the two versions is and will it work in my truck?
Thanks for any advice
Thread Starter
|
Cross-Country
Joined: Sep 2018
Posts: 64
Likes: 1
Took my garbage to the dump, backed up and when I moved forward to leave the 4x4 high lite was on and it was engaged in 4 wd. It will not disengage. I removed the shifter motor and it runs fine both directions. Checked all the wiring and everything is good for continuity. I did test P7 from the Mitchel info and it should get 5 volts on the MSS switch connector pin 3. I get 0 volts. The fix is replace the module in the Mitchel info. I can remove the shifter motor and electrically move it back to the 2 WD position. I can manually shift the transfer case to 2 WD. When I reinstall the shifter motor and select 4 high it moves to 4 high (lite comes on and it is engaged). When I try to go back to 2 wd it does not move. I can do that with the shifter motor off the transfer case and watch it. I also bench tested the module by connecting power and ground to the appropriate pins and checking the pin that should give 5 volts and it is 0 so definitely a module problem.
When I looked at the pinout and it is the same I can't see any damage being done to anything else but I would like to be sure. My guess is that there is a simple program change.
When I looked at the pinout and it is the same I can't see any damage being done to anything else but I would like to be sure. My guess is that there is a simple program change.
Thread Starter
|
Cross-Country
Joined: Sep 2018
Posts: 64
Likes: 1
I did so many tests using the Mitchel Pinpoint tests I cannot recall for sure. I believe it was 10.8 volts and should be 0. I will go out later and recheck all of them and post it.
Thanks for the help.
Thanks for the help.
Thread Starter
|
Cross-Country
Joined: Sep 2018
Posts: 64
Likes: 1
I repeated Mitchel Pinpoint Tests 6 and 7.
PP test 6 Key On C281B disconnected Check voltage on MSS pins 2 and 3 Voltage is 0 on both. It should be 0 volts so it passes the test. It only makes sense since power to the module is provided through C281B pins 1&2 and ground through pin 3. With C281B disconnected there should be no voltage.
PP Test 7 Key On C281B connected Check voltage on MSS pin 3 11.2 volts It should be 5 volts so fails the test. This voltage is there with the key on or off. The supply is through fuse 40 which is hot at all times.
Check voltage on MSS pin 2 0 volts Not part of the Mitchel test.
PP test 6 Key On C281B disconnected Check voltage on MSS pins 2 and 3 Voltage is 0 on both. It should be 0 volts so it passes the test. It only makes sense since power to the module is provided through C281B pins 1&2 and ground through pin 3. With C281B disconnected there should be no voltage.
PP Test 7 Key On C281B connected Check voltage on MSS pin 3 11.2 volts It should be 5 volts so fails the test. This voltage is there with the key on or off. The supply is through fuse 40 which is hot at all times.
Check voltage on MSS pin 2 0 volts Not part of the Mitchel test.
Thread
Thread Starter
Forum
Replies
Last Post
cbrown123
1999 - 2016 Super Duty
0
Apr 25, 2016 05:22 PM
