Jumping through hoops (EEC)
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Jumping through hoops (EEC)
Folks,
Any help would be appreciated. I have a 95 Bronco 5.0, which was for lack of a better word bogging on take off, and seemingly trying to bog in OD @ 60-65 MPH and would be accompanied by the check engine light only when that happened. Floor the truck, cleared out and went about its business. So, I went and picked up one of those Actron scanners and it reported a 121 or TPS out of range. I figured based on the behavior, that would be reasonable so I swapped it out. Now, the truck runs like a bat out of hell, very responsive, great idle....BUT, shifts very hard (AOD), and the check engine light is on constantly. I re-run the code check and it yields a 122 this time, or low voltage. This is where I run out of knowledge. It occurred to me to perhaps reset the computer which I found a procedure, hopefuly the correct one..disconect the battery for 30 minutes. Am I barking up the right tree here? Again, any assistance would be appreciated.
Thanks in advance
Larry
Any help would be appreciated. I have a 95 Bronco 5.0, which was for lack of a better word bogging on take off, and seemingly trying to bog in OD @ 60-65 MPH and would be accompanied by the check engine light only when that happened. Floor the truck, cleared out and went about its business. So, I went and picked up one of those Actron scanners and it reported a 121 or TPS out of range. I figured based on the behavior, that would be reasonable so I swapped it out. Now, the truck runs like a bat out of hell, very responsive, great idle....BUT, shifts very hard (AOD), and the check engine light is on constantly. I re-run the code check and it yields a 122 this time, or low voltage. This is where I run out of knowledge. It occurred to me to perhaps reset the computer which I found a procedure, hopefuly the correct one..disconect the battery for 30 minutes. Am I barking up the right tree here? Again, any assistance would be appreciated.
Thanks in advance
Larry
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most code scanners will allow you to erase your codes with a few buttons, but 30 min with the battery off works just as well. Your on the right track, erase the codes, put some miles on her, and check your codes again to see if it comes back. If it does: you either got a bad replacement sensor (malfunctional) or you may have some bad wiring going to the TPS. Code 121 means TPS voltage higher/lower than expected, and 122 means that it is LOWER than expected, or it is occasionaly not recieving it at all. That sounds like you have an intermidant open in the line going to the sensor. HOPE THIS HELPS!
Fleet Mechanic
Joined: Nov 2003
Posts: 1,995
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From: North Dakota
In 95 you would have the E4OD, not the AOD. The E4OD is controlled by the computer, I am pretty sure that it runs the codes from the computer as well. I have heard of other people having the same shift problem with the E4OD and it was a MLPS sensor(I think that is the name) problem. If you do a search there will be plenty of things that come up about it.
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Joined: Oct 2004
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From: China Spring, TX (Waco)
If you have a wiring diagram, identify the TPS ref gnd and ref voltage wires and insert a straight pin through the wire insulation and then you can use a digital volt meter to see whats going on. Some TPS's have one hole slotted so the voltage can be adjusted.
cds
cds
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After hours of entertainment (not), turns out my brand spanking new Carquest TPS sensor was bad. After running through all the test suggestions, and checking my install God knows how many times, I said screw it...went to Advance Auto Parts, got another TPS, runs and shifts perfectly. Oh well live and learn!
Thanks for your suggestions!
Larry
Thanks for your suggestions!
Larry
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