Blinking O/D light Aggghhhhhhhhhh!
Thread Starter
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Cross-Country
Joined: Apr 2007
Posts: 62
Likes: 0
Blinking O/D light Aggghhhhhhhhhh!
Ok here goes. My o/d light is blinking and the shift is damnd hard from first to second. Little easier on 2nd into 3rd. No control on o/d switch. Starts blinking within 1 or two min of starting and not going anywhere(i let her warm up first).
Ok the details now. 97, turbo diesel, auto trans(e4od ?), manual transfer case. 56,430 ish miles original on truck and powertrain. I have a 96 engine and power train manual, and a 97 body chassis manual. The sensor on the top of rear diff is for the abs. Cleaned the contacts and put back together. Found the sensor on the transfer case for shift and cleaned it.
I cannot find the VSS on the transmission but book says model differences if it is there or not i guess. No blown fuses, spedo works, lights work.
Tried to read codes at auto zone and shows nothing, but from what I gather I need a ford specific scanner to read these codes.
I am now trying to clear codes by disconnecting batteries.
Any other thoughts?
Ok the details now. 97, turbo diesel, auto trans(e4od ?), manual transfer case. 56,430 ish miles original on truck and powertrain. I have a 96 engine and power train manual, and a 97 body chassis manual. The sensor on the top of rear diff is for the abs. Cleaned the contacts and put back together. Found the sensor on the transfer case for shift and cleaned it.
I cannot find the VSS on the transmission but book says model differences if it is there or not i guess. No blown fuses, spedo works, lights work.
Tried to read codes at auto zone and shows nothing, but from what I gather I need a ford specific scanner to read these codes.
I am now trying to clear codes by disconnecting batteries.
Any other thoughts?
Thread Starter
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Cross-Country
Joined: Apr 2007
Posts: 62
Likes: 0
Ok, thanks for nothing guys.... Just kidding. By following the previous threads and seeing what they had done, I have been able to fix the situation. Not sure what it was, but Ill keep you updated. By clearing the codes and other stuff, the light has stopped flashing, no hard shifting, and runs like a top. Musta been a fluke or something when I had the camper in it or who knows, maybe those pesky underpants knomes. Keep up the postings of how to fix these problems.... It really helps the pocket book, especially at 4.25$ a gallon.
Thank you!
Thank you!
Lead Driver
Joined: Oct 2010
Posts: 5,132
Likes: 45
From: Columbus, Oh
Your first post was rather confusing. At least I was having a hard time making sense of it. If the OD light is flashing, then you have a trans code. If disconnecting batts fixed it, my guess is its only temporary. A good code reader is needed to read these trucks. Autozone can't do it. The VSS is located on top of the rear diff.
Cargo Master
Joined: Jul 2010
Posts: 3,014
Likes: 115
Now, this may be because I've been drinking, but it made perfect sense to me, lol.
Edit: And I've got to say - my O/D off light never flashes. Probably because it's sitting in a storage box somewhere.
Edit: And I've got to say - my O/D off light never flashes. Probably because it's sitting in a storage box somewhere.
Hotshot
Joined: Dec 2005
Posts: 14,377
Likes: 609
From: evansville in
You needed to check the code.if it does not cime back until the caamper is hooked up my bet is converter slip code.but at this point who knows.the hist should tell if it didn't loose it.its still broken.just in remussion.the train is still coming
Thread Starter
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Cross-Country
Joined: Apr 2007
Posts: 62
Likes: 0
Your first post was rather confusing. At least I was having a hard time making sense of it. If the OD light is flashing, then you have a trans code. If disconnecting batts fixed it, my guess is its only temporary. A good code reader is needed to read these trucks. Autozone can't do it. The VSS is located on top of the rear diff.
Last edited by sirenalx; May 4, 2013 at 01:11 PM. Reason: add info
Cargo Master
Joined: May 2011
Posts: 2,623
Likes: 0
From: Rockford IL
Nope, the only electrical connector on the top of the rear diff is the ABS sensor, according to my service manual. It has one bolt with a sliding flange fork to hold it in place. I could be wrong, but that is what the book says. It doesnt look like the vss pictured in the book either. I could be wrong, thats been known to happen. And yes, the code reader at autozone wouldnt do it, but it works on my sprinters. Any advice on code readers? I was looking at one that used software and a laptop to read codes.
Maybe your truck PO did a VSS delete kit! LOL
JK...but in all seriousness it should be there. Otherwise what is communicating with the CPS and PCM to tell it when to shift?
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Lead Driver
Joined: Oct 2010
Posts: 5,132
Likes: 45
From: Columbus, Oh
Nope, the only electrical connector on the top of the rear diff is the ABS sensor, according to my service manual. It has one bolt with a sliding flange fork to hold it in place. I could be wrong, but that is what the book says. It doesnt look like the vss pictured in the book either. I could be wrong, thats been known to happen. And yes, the code reader at autozone wouldnt do it, but it works on my sprinters. Any advice on code readers? I was looking at one that used software and a laptop to read codes.
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Thread Starter
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Cross-Country
Joined: Apr 2007
Posts: 62
Likes: 0
huh, well crap. Ill remove it one day to verify, but I did clean the contacts on the plug and the sensor. All is dandy, Ill drive some this afternoon and going on a road trip tonight. Ill keep you posted. Thanks again guys.
Junior User
Joined: Dec 2005
Posts: 79
Likes: 1
From: Flint, MI
Out trucks don't have '4 channel' ABS. So there is no wheel speed sensor on left rear and right rear tires. The sensor at the top of the diff looks at a 120 tooth tone wheel mounted to the differential housing. The signal which comes back from it is used for VSS, and (so far as I can ascertain) as a rear axle ABS input. I know it's used for VSS as I tapped the signal at the sensor and it is identical to the signal coming off the VSS pin of the PCM.
So far as your original O/D light flashing I suspect, as was posted earlier, a temp code was set for trans slip when you pulled the camper. Removing the batteries was enough to reset this code. I don't pull much of anything but I hate how much the torque converter slips in general in my truck, so I wired in a TC lockup override switch.
My truck is a 97 F250HD 4x4 with E4OD & 306k miles.
Rory
So far as your original O/D light flashing I suspect, as was posted earlier, a temp code was set for trans slip when you pulled the camper. Removing the batteries was enough to reset this code. I don't pull much of anything but I hate how much the torque converter slips in general in my truck, so I wired in a TC lockup override switch.
My truck is a 97 F250HD 4x4 with E4OD & 306k miles.
Rory
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