E4OD Limp Mode
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
The entire limp mode is IN the ECU. It commands a higher pressure, and depending on what the problem is, it can limit what gears to use, and even how much torque the engine can produce.
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I just pulled codes and I get 652: modulated lock-up torque converter clutch solenoid circuit fault.
What would this to do the behavior? My shifts are not nearly as hard as before, which is when I noticed an issue. OD light blinks. Would the ECU reduce power in this situation?
What would this to do the behavior? My shifts are not nearly as hard as before, which is when I noticed an issue. OD light blinks. Would the ECU reduce power in this situation?
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OK, definately not in limp mode. However, I did find the fluid was low by about a gallon. Once I got the fluid level correct I took it out for a drive. I am getting hard shifts into reverse and it seems like the shifting from 1-2 and 2-3 is short, meaning not long enough. So something is still not right.
Suggestions on how to troubleshoot?
Suggestions on how to troubleshoot?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,704
Likes: 2,625
From: SE Florida
Check the fluid level again. Do it with the trans warmed up and the engine idling in park. I don't think the trans would operate if it were really a gallon low, so now I think you have overfilled it.
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Today when I started the truck I let it warm up to full operating temp before even shifting into drive. When I shifted into drive I noticed some gurgling sounds coming from the trans so I pulled the dipstick and it was dry. I left the motor running and would add fluid, a quart at a time, shift through the gears and then check the fluid level. After 1 gallon I got it to the right spot.
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ok, I will make sure to do that when I can, might be a day or two.
On the possibility that might trans fluid was low...if it was so low that the solenoid assembly didn't have enough fluid in it, could it be damaged if I drove it long enough?
On the possibility that might trans fluid was low...if it was so low that the solenoid assembly didn't have enough fluid in it, could it be damaged if I drove it long enough?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,704
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From: SE Florida
The problem isn't the solenoids not having enough fluid. It is that the pump sucks air instead of fluid. This can damage the pump because it doesn't like to run dry. Also, any clutches that are engaged will slip if the pump doesn't maintain pressure.
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I have heard some people using mercon V in the E4OD. I have always used Mercon III. Any thoughts as to which one I should use? Does it matter how the tranny is built to determine what fluid to use?
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
First off you have never used MERCON III. There is and has never been a MERCON III fluid. Ever. There was MERCON, then MERCON V, then MERCON SP, MERCON LV, etc. There never was a MERCON III.
MERCON has been discontinued. Nobody can make a MERCON fluid any longer. There are still fluids available that say, "For use in transmissions that previously used MERCON." What's in those fluids? Nobody knows. When Ford licensed MERCON fluids they tested samples and approved that the fluid met their specs. Nobody does that for these fluids.
Ford still licenses and tests MERCON V fluids. That's the right one to use.
MERCON has been discontinued. Nobody can make a MERCON fluid any longer. There are still fluids available that say, "For use in transmissions that previously used MERCON." What's in those fluids? Nobody knows. When Ford licensed MERCON fluids they tested samples and approved that the fluid met their specs. Nobody does that for these fluids.
Ford still licenses and tests MERCON V fluids. That's the right one to use.
Fleet Owner
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From: Easton,Ks
DTC 652 indicate solenoid did not change state when requested by the Powertrain Control Module (PCM).
Possible causes:
-- Damaged solenoid/assembly.
-- Open or shorted harness (internal/external).
-- Damaged PCM.
