another e4od question

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Aug 29, 2012 | 09:12 PM

quesey

Thread Starter

Laughing Gas

Joined: Aug 2006

Posts: 1,249

Likes: 10

From: oklahoma

another e4od question

pulled trans apart tonight.found it has been rebuilt and a billet converter and a shift kit.Now is the ? when i had it running the OD light would flash after i'd rev it up.back at idle it may go off or still flash.kill it and restart and it would'nt flash till i'd rev it agian.so i pulled it apart and found that none of clutch's were burnt most still had the part number's still on them.and fluid was clean as was the pan.just wondering what would cause OD light to flash like that.could it have been something reading from the bad motor?
thanks john

Aug 29, 2012 | 09:17 PM

Action4478

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From what I have read , the only thing on an OBS that can cause a slip code , is the TC ...

What was the code ...?

Aug 29, 2012 | 10:04 PM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,698

Likes: 2,620

From: SE Florida

Quote:

Originally Posted by quesey

just wondering what would cause OD light to flash like that.could it have been something reading from the bad motor?
thanks john

It could be a bad electrical connection, or a bad sensor, or a bunch of other things. I sure wouldn't tear down a transmission because the OD light flashed. Without knowing the codes that are stored you can't have a clue as to what's wrong.

Quote:

Originally Posted by Action4478

From what I have read , the only thing on an OBS that can cause a slip code , is the TC ...

Not true. The slip code can only set in fourth gear with the torque converter locked, but there is no way to tell what is slipping. It could be the torque converter or it could be the transmission.

Quote:

Originally Posted by Action4478

What was the code ...?

That is the critical question. Without knowing the code you probably won't be able to fix this.

Aug 29, 2012 | 10:12 PM

Action4478

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Joined: Aug 2006

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There ya go , OP , you know what to do now ...

Aug 30, 2012 | 05:37 AM

quesey

Thread Starter

Laughing Gas

Joined: Aug 2006

Posts: 1,249

Likes: 10

From: oklahoma

heres the codes i pulled before pulling motor and trans

P0269 Cylinder 3 Contribution/Balance Fault
P0281 Cylinder 7 Contribution/Balance Fault

P0713 Transmission Fluid Temp. Sensor CKT High Input

P0470 Exhaust Back Pressure Sensor Circuit Malfunction.

P1280 ICP Circuit Out of Range Low.

P0122 Accelerator Pedal Sensor Circuit Low Input.

had this one to but cant find it in the list p1748.

Now from what all i've read about the OD light flashing.most say the trans would most likely need a rebuild that's why i'm asking.Now me i'd rather open it up and look at it while the motor is out. than put it back together and then have to pull transfer case and trans back out.
thanks john

Aug 30, 2012 | 09:23 AM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,698

Likes: 2,620

From: SE Florida

Go ahead and pull the trans down. While you're in there check the trans fluid temp sensor and the wiring to the sensor. There is an electrical fault in that circuit causing the OD light to flash and the hard shifts. There is also a fault to the pressure control solenoid that is setting the P1748. Both of these are pointing to a wiring harness problem.