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Infiniti G35 Automatic Transmissions

12 messages,  Last post on Jul 17, 2008 at 1:29 PM

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What is this discussion about? Infiniti G35, Transmission, Coupe, Sedan

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#4 of 12 Re: Shifting problems in Auto 2004 G35 Coupe [msidman] by scottm123 Sep 12, 2007 (9:50 am)
Replying to: msidman (Sep 12, 2007 9:25 am) I know this can be done yourself, but every car is slightly different and I honestly don't know off the top of my head. Hit the guys G35Driver and ask there. I don't have access to there while at work. Replies to this message: msidman (Sep 12, 2007 4:00 pm)
#5 of 12 Re: Shifting problems in Auto 2004 G35 Coupe [scottm123] by msidman Sep 12, 2007 (4:00 pm)
Replying to: scottm123 (Sep 12, 2007 9:50 am) Nice, thanks for your help. I actually went over to their forums and found a whole section on reprogramming the ECU.   I found an even better link right here which walks you through the steps: ECU Resetting Procedures   I haven't tested it out yet but hopefully this fixed this issue.
#6 of 12 Resetting ECU did not help... still having shifting problems by msidman Dec 25, 2007 (2:21 pm)
Well, I tried resetting the ECU... but of course it didn't fix the problem. I was leaving the country at the time so I sorta hoped that after 3 months it would fix itself, which it didn't either. So now I have no idea what the problem could be. I've taken it to the dealership multiple times about this problem and of course they can't reproduce the problem. Any help would be appreciated. Thanks guys. Replies to this message: jray2049 (Jun 24, 2008 1:26 pm) msidman (Jun 24, 2008 3:10 pm) jray2049 (Jun 26, 2008 6:45 pm) and 2 more...
#7 of 12 Re: Resetting ECU did not help... still having shifting problems [msidman] by jray2049 Jun 24, 2008 (1:26 pm)
Replying to: msidman (Dec 25, 2007 2:21 pm) I'm having the same symptoms you describe. I'm going in for 60K service on Thursday, so I will ask them if they have heard of this before. I also will have trouble demonstrating it for them. It's been happening for at least a couple years, but it seems to be happening more frequently now, but perhaps that is due to less pedal to the metal due to high fuel prices. (Like you say, it only happens with light acceleration, not heavy.)   Did you ever find a solution?   Thanks. Replies to this message: msidman (Jun 24, 2008 3:10 pm) jray2049 (Jun 26, 2008 6:45 pm) esfoad (Jul 02, 2008 11:49 am) and 1 more...
#8 of 12 Re: Resetting ECU did not help... still having shifting problems [jray2049] by msidman Jun 24, 2008 (3:10 pm)
Replying to: jray2049 (Jun 24, 2008 1:26 pm) I could never convince the dealers that there was a problem so I stopped trying... I actually go to school in Miami, and didn't notice a problem down there, but I think it's because there was a lot of stop/starting in the traffic, and I wasn't able to really have the distance to accelerate slowly.   Now that I'm back on the Cape I've noticed it a lot more, especially because I am trying to conserve fuel by not accelerating hard.   Let me know if you find out anything from your dealer. Replies to this message: jray2049 (Jun 26, 2008 6:45 pm) esfoad (Jul 02, 2008 11:49 am) msidman (Jul 02, 2008 11:59 am)
#9 of 12 Re: Resetting ECU did not help... still having shifting problems [msidman] by jray2049 Jun 26, 2008 (6:45 pm)
Replying to: msidman (Jun 24, 2008 3:10 pm) Sure found out a lot from the dealer: "Never heard of that." "No error codes are shown." (I asked if any error codes were logged.) "No updates are available." (I asked if there were any tranny firmware updates.) "Unable to confirm." (As we expected.) Oh well. If it doesn't get worse I can live with it. If it does get worse, I have two years left on my extended warranty... Replies to this message: esfoad (Jul 02, 2008 11:49 am) msidman (Jul 02, 2008 11:59 am)
#10 of 12 Re: Resetting ECU did not help... still having shifting problems [jray2049] by esfoad Jul 02, 2008 (11:49 am)
Replying to: jray2049 (Jun 26, 2008 6:45 pm) I hope this helps you. I got this from the G35 Driver so kudos to them:   ECU Resetting Procedures   Timing is extremely critical. If it is NOT DONE within the specify time, the ECU will not reset and the Check Engine Light (CEL) will continue to remain ON. A stop watch or an analog clock with a second’s needle will be useful.   Operations Procedures for Basic reset. 1. Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds. 2. Repeat the following steps (2a and 2b) procedures quickly five times within 5 seconds. 2a. Fully depress the accelerator pedal (HARD). 2b. Fully release the accelerator pedal. 3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the CEL starts blinking. 4. Fully release the accelerator pedal (while the CEL is still blinking) 5. Wait about 10 second. 6. Fully depress the accelerator pedal and keep it for more than 10 seconds. 7. Fully release the accelerator pedal (The CEL light will continue to blink). 8. Turn ignition switch to “OFF” position and now you can start the car. The CEL light should be gone.   If the CEL light continues to remain ON, repeat the above steps. Timing is EXTREMELY critical to resetting the ECU.   Hope this works. There are also directions on Accelerator Pedal Release Position Learning, Throttle Valve Closed Position Learning and Idle Air Volume Learning (Throttle Position Learning). So if you want those either I will post here or just go to G35Driver and do a quick search. Replies to this message: msidman (Jul 02, 2008 11:59 am)
#11 of 12 Re: Resetting ECU did not help... still having shifting problems [esfoad] by msidman Jul 02, 2008 (11:59 am)
Replying to: esfoad (Jul 02, 2008 11:49 am) I actually have a print out of those exact directions for the ECU reset and others, but thanks for the post! I thought for sure it would fix the problem, but I've done the ECU reset probably around 10 or so times, and it doesn't seem to get any better.   Just my luck... of course. I've sort of given up on the problem and have just dealt with it.   Over time I've actually been able to predict when the shifting problem is about to occur... it almost seems as if the engine gets stuck at lower RPMs when it hits around 40 mph. (For example, I will be pushing on the accelerator and the RPMs won't increase as they normally do, albeit they might do it slightly slower).   If I know its coming, most of the time I can break it by accelerating harder, and then taking my foot off the gas, sort of powering it through to the next gear.
#12 of 12 2004 G35X Transmission Question by adbrick Jul 17, 2008 (1:29 pm)
Just purchased a 2004 G35X with 56,000 miles. The rpms at 70 MPH are nearning 3500. Is this normal. At 55 mph they are 2200. Seems high for a 5 speed auto. I notice when I am in autoshift that it only goes to 4th gear. I was told this was a 5 speed auto with overdrive.

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