02 Excursion Output Shaft Sensor

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Sep 18, 2008 | 01:01 PM

ppo2

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From: Delaware

02 Excursion Output Shaft Sensor

Hello everyone,

Would some kind soul please enlighten me on the purpose/role of an output shaft sensor? I have a 4x4 '02 excursion with roughly 61,000 miles on it.

Thanks for any input.

Sep 18, 2008 | 01:47 PM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

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From: SE Florida

The trans software uses the input from the turbine speed sensor (on the input shaft) and the output speed sensor to control the shifts in the transmission. With these two inputs the actual ratio across the transmission can be calculated in real time. This information is used to control the pressures during a shift. The same info is also used for diagnostics. If the trans is supposed to be in a certain gear the ratio is calculated and compared to what the ratio should be. If it's wrong a code is stored and the OD OFF light flashes.

Sep 18, 2008 | 02:14 PM

ppo2

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From: Delaware

Hi Mark,

Thanks for the fast reply. That probably explains why my OD light kept flashing while on idle in traffic in NYC last Friday. Would that be enough to cut off the engine?

Kind regards,

Dan

Sep 18, 2008 | 03:20 PM

Stewart_H

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From: Central Coast of CA

Quote:

Originally Posted by Mark Kovalsky

Darn! Ya beat me to it, Mark!

I stayed at a Holiday Inn Express last night and was gonna post exactly what you wrote, but ya beat me to it!

Stewart

Sep 19, 2008 | 07:09 AM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,725

Likes: 2,652

From: SE Florida

Quote:

Originally Posted by ppo2

That probably explains why my OD light kept flashing while on idle in traffic in NYC last Friday. Would that be enough to cut off the engine?

No, an OSS error will not cut off the engine. And you have to be moving to test the OSS, so it is not likely that the OSS was causing the OD light to flash when you were at idle.

What code was stored when the OD light flashed?

Sep 24, 2008 | 07:41 PM

ppo2

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From: Delaware

Hi Mark,

I don't mean to be rude by asking a question and not posting back to your reply. Code was P-0722. Parts replaced: Fuse - $0.74, Sensor Assembly - Speed - $32.00, Labor $225.00.

After this brief engine cut-off issue, I was in an accident. Two guys driving a subaru legacy wagon decided to cut in front of me. Tore his wagon like a can opener from front fender to rear fender. Turns out he was uninsured. My only damage was my corner bumper was scraped and pushed in a bit by about an inch. These trucks are marvelous machines.

Drive safe,

Dan