5R55E information request
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Junior User
Joined: Mar 2007
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5R55E information request
Since this is an information request and not a problem, I thought I should start a new thread rather than putting it on the problem thread.
Does anyone know (or where I can find the information) how the 5R55E transmission would or might respond to not having input from IAT, ECT, and MAF sensors?
Thanks,
Ed
Does anyone know (or where I can find the information) how the 5R55E transmission would or might respond to not having input from IAT, ECT, and MAF sensors?
Thanks,
Ed
Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
Ed, as you know the PCM is responsible for the timing and feel of shifts on the 5R55E. It does this mainly based on "load" calculations. As such, shifting will be harsh without an MAF signal for the PCM to rely upon, since the MAF is the primary sensor for determining load.
One time I forgot to re-connect the MAF harness on my Ranger and drove around for a little while like that. The shifting was horrible, harsh and ill-timed. I was actually happy when it threw an MAF code because I knew right then and there what I had done. When I hooked the MAF back up, everything returned to normal.
HTH
One time I forgot to re-connect the MAF harness on my Ranger and drove around for a little while like that. The shifting was horrible, harsh and ill-timed. I was actually happy when it threw an MAF code because I knew right then and there what I had done. When I hooked the MAF back up, everything returned to normal.
HTH
Moderator
Joined: Jan 2004
Posts: 13,851
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From: SW Va
The first two would likely have more effect on how the engine runs, as they more directly affect the air/fuel ratio.
Edit: Dang that doesn't read right. What I was trying to say was the first two would be more likely affect the air/fuel ratio & thus fuel consumption.
And as Joe said, the MAF would be more likely to affect the engine's smoothness & tranny shifting.
Edit: Dang that doesn't read right. What I was trying to say was the first two would be more likely affect the air/fuel ratio & thus fuel consumption.
And as Joe said, the MAF would be more likely to affect the engine's smoothness & tranny shifting.
Former ******
Joined: Nov 2004
Posts: 4,901
Likes: 2
From: Salt Lake City, Utah
Without those sensors working, overdrive and torque converter lockup may also be disabled. Since 2nd gear is actually 1st gear with overdrive, you might loose second gear and jump straight to third and forth.
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