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Sentra only works in reverse and drive
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kellybig
Novice
Jul 28, 2016, 6:43 PM
Post #1 of 15
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Sentra only works in reverse and drive
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Helping a friend with his car. Says he put another used tranny in because car was throwing codes and bogging down. Codes are po755 solenoid b tranny code: po731 1st gear ratio code: and po505 code idle air control code. I replaced the solenoids on the cheap. No change. He indicates he sent the ecm into have tested and it is all good. Battery has good amps, no missing fuses. Car only works in drive park neutral and reverse. Dies frequently. Will not up shift or downshift. I am am skeptical that 2 used granny's and solenoid sets are bad. It is a 2001 Nissan Sentra gxe automatic with a 1.8 liter engine. Confused on what to try next. I'm thinking the transmission control unit. Any advice is much appreciated.
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gsferraro
Veteran
Jul 29, 2016, 5:29 PM
Post #2 of 15
(1847 views)
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Re: Sentra only works in reverse and drive
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Hello,
I believe the P0755 on this trans is an eletrical code, that is why the car is in failsafe, if you clear the code does it come right back?
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kellybig
Novice
Jul 29, 2016, 5:54 PM
Post #3 of 15
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Re: Sentra only works in reverse and drive
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Yes. It does.
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gsferraro
Veteran
Jul 30, 2016, 9:35 AM
Post #4 of 15
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Re: Sentra only works in reverse and drive
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Helo,
Of course you have to fix that first, that can be solenoid, wire or computer, but make sure you check fuses and connections first, then ohm the solenoid at the computer, this will check the wire and solenoid. Gary
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kellybig
Novice
Jul 30, 2016, 8:53 PM
Post #5 of 15
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Re: Sentra only works in reverse and drive
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Thanks for the replies Gary. I replaced the solenoid so that rules that out. I am going to replace transmission control unit in the am. The ecm is good. If this does not work should I just start ohm testing all wires from the computers to the tranny?
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kellybig
Novice
Jul 30, 2016, 8:54 PM
Post #6 of 15
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Re: Sentra only works in reverse and drive
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Forgot to add, fuses are all good.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 31, 2016, 4:38 AM
Post #7 of 15
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Re: Sentra only works in reverse and drive
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I didn't read anywhere that Gary said to replace anything. His instructions were to TEST to find the issue.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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kellybig
Novice
Jul 31, 2016, 9:20 AM
Post #8 of 15
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Re: Sentra only works in reverse and drive
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Because I do not have full time access to the car, replacing the TCU to rule it out is a nominal amount to me.
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kellybig
Novice
Jul 31, 2016, 7:23 PM
Post #9 of 15
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Re: Sentra only works in reverse and drive
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Today had time to pull electrical connections leading from the harness to the tranny; 2 female ends, one had 9 wires/holes to 9 pins the other had seven wires/holes to 6 pins the male end at the top of the transmission is very hard to see; looks like one pin could be broken off; found what looks like a wire coming through on this female end; could this be the culprit?
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gsferraro
Veteran
Aug 1, 2016, 7:23 AM
Post #10 of 15
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Re: Sentra only works in reverse and drive
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Any corrosion on the wires? It could be the problem.
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kellybig
Novice
Aug 1, 2016, 10:00 AM
Post #11 of 15
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Re: Sentra only works in reverse and drive
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no corrosion ; just a protruding wire and possible broken pin
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 1, 2016, 10:12 AM
Post #12 of 15
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Re: Sentra only works in reverse and drive
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? You see this "possible" protruding wire and broken pin but don't seem so sure. Understood some are hard to get a good look but if just connected ohm test that suspect wire for just continuity.
Yes a broken wire or lack of connection can screw things up - anywhere but you have a problem and this in front of you so fix it or know it's good now,
T
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kellybig
Novice
Aug 1, 2016, 3:26 PM
Post #13 of 15
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Re: Sentra only works in reverse and drive
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I tried to get a couple of pics but they came out bad. Very difficult to see. When I go back I will try to get some pics and test it. I met this guy on Craigslist. He is 94 years old. You are correct. I am not sure. Ran out of time and had to be to another appointment. I can only get over there every few days.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 1, 2016, 4:19 PM
Post #14 of 15
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Re: Sentra only works in reverse and drive
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Try getting an automotive dental type mirror if need be - not for a picture just to verify this is broken or not by sight first,
T
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kellybig
Novice
Aug 1, 2016, 4:29 PM
Post #15 of 15
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Re: Sentra only works in reverse and drive
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Will do
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