Blinking OD Light update... - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 16 (permalink) Old 10-24-2007, 12:28 AM Thread Starter
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Blinking OD Light update...

Finally got the damn thing to stop blinking. My fire chief who is a powerstroke technician did a scan on my truck with his snazzy snap on scanner and the tranny was throwin a code talkin about the torque converter slipping. It also said the MAP sensor was bad. Because my fire chief is a bad ***, he happend to have a brand new MAP sensor in his truck. So we popped it in and so far everything is great. He said if it starts blinking again that we would have to put in a new torque converter. Just wanted to share this info with you guys, thanks for all the help!

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post #2 of 16 (permalink) Old 10-24-2007, 02:50 AM
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post #3 of 16 (permalink) Old 10-24-2007, 04:10 AM
 
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Quote:
Originally Posted by F350_Beast
Finally got the damn thing to stop blinking. My fire chief who is a powerstroke technician did a scan on my truck with his snazzy snap on scanner and the tranny was throwin a code talkin about the torque converter slipping. It also said the MAP sensor was bad. Because my fire chief is a bad ***, he happend to have a brand new MAP sensor in his truck. So we popped it in and so far everything is great. He said if it starts blinking again that we would have to put in a new torque converter. Just wanted to share this info with you guys, thanks for all the help!
He may be right. There actually is no sensor that can determine torque converter slip. The code was revised to transmission slip. Basically the code is generated when the PCM inputs from engine and axle don't match. Since the transmission is between them, it gets the blame.

A bad Map/Baro sensor would affect fuel mixture, which also affects rpm and speed. Hopefully it was a hard fault, with the OD light blinking constantly not just sometimes. Those type of sensor failures are the most straight forward to repair. The converter/transmission code slip is an educated guess at best.



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post #4 of 16 (permalink) Old 10-24-2007, 04:37 AM
 
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My truck the OD light has been flashing on and off also. When the light is flashing the tranny shifts hard. the tranny is shifting fine in all gears and if i push the OD switch it still kicks out of overdrive fine. Then the light stops flashing the tranny shifts smooth.?????? any idea would would cause this.???

it has been doing this off and on for about a month now.
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post #5 of 16 (permalink) Old 10-24-2007, 05:32 AM Thread Starter
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Quote:
Originally Posted by zippar
My truck the OD light has been flashing on and off also. When the light is flashing the tranny shifts hard. the tranny is shifting fine in all gears and if i push the OD switch it still kicks out of overdrive fine. Then the light stops flashing the tranny shifts smooth.?????? any idea would would cause this.???

it has been doing this off and on for about a month now.
try what i did...replace the map sensor. either that or it could be a speed sensor (in the rear diff.) have you had it scanned for codes yet?

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post #6 of 16 (permalink) Old 10-24-2007, 05:50 AM
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when my brother had a 97 the flashing OD light was a warning that his tranny was going, it did this every time it ate a tranny...BTW it went though 6 in 3 months.

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post #7 of 16 (permalink) Old 10-24-2007, 06:24 AM
 
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Quote:
Originally Posted by zippar
My truck the OD light has been flashing on and off also. When the light is flashing the tranny shifts hard. the tranny is shifting fine in all gears and if i push the OD switch it still kicks out of overdrive fine. Then the light stops flashing the tranny shifts smooth.?????? any idea would would cause this.???

it has been doing this off and on for about a month now.
The light and hard shift are related. Hard shift happens in fail safe mode. A shift strategy that is adaptive when the pcm detects a fault and flashes the light. Line pressure is raised to allow you to drive for service and have the service code read. Raised LP causes the hard shift.
I recommend you have the code(s) read first. There are many. 1 is tranny overheat. You have a tranny temp sensor on board. The best course is to know the codes meaning and if it's valid or a byproduct of another code before buying parts.


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post #8 of 16 (permalink) Old 10-24-2007, 04:30 PM
 
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Mine is doing the same thing. when my buddy read the codes he told me it was the torque converter lockup sylenoid (sp). Anyone had this, I am going to replace it and see if that fixes the problem.
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post #9 of 16 (permalink) Old 10-24-2007, 05:07 PM
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make sure there is no water in the weather pack connecter where the body harness for the transmission plugs into the side of the tranny, that will cause all kinds of fun!

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post #10 of 16 (permalink) Old 10-24-2007, 05:45 PM
 
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Definately get the codes read before throwing parts at it..

In my experience the O/D flashed when the PCM got "Upset" about a shift. 2 months after it started doing this I ended up at John Wood for a complete rebuild as it was smoked!
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