 transmission stuck in 1st speed when its in 4lo |
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  Oct 21 2008, 06:00 PM
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#1
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 Group: ZR2 Owner Posts: 31 Joined: 28-September 08 From: Chihuahua, Mexico Member No.: 8,090  |
well, now i am having a new problem... i made the conversion to floor shifter (np233) and seems like everything works fine... but when the truck is in 4lo the automatic transmission is stuck in first speed... (IMG:style_emoticons/default/frown.gif) i disconnect the tccm before install the floor shifter because it produces a fault in transmission, it was making premature shifts...
but now when its in 4lo the transmission is stuck in first speed... and the tccm is disconnected... what could i do to fix it???? thanks a lot for all answers i hope anyone know what to do....... This post has been edited by carlos cowboy: Oct 21 2008, 06:01 PM |
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Oct 21 2008, 06:43 PM
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#2
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"Yer Keviness" (aka n00b Admin)  Group: Administrators Posts: 6,385 Joined: 11-November 06 From: Holland MI / East Lansing for school (MSU) Member No.: 2,751 |
Wait - you say you swapped to a "floor shifter" and then mention a 233.
So did you put in a floor shifted 231, or make your 233 a floor shift like in the Pinned Topic? |
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Oct 21 2008, 06:47 PM
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#3
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Group: ZR2 Owner Posts: 31 Joined: 28-September 08 From: Chihuahua, Mexico Member No.: 8,090 |
i made my 233 to a floor shift like in the Pinned Topic! but so much better than that... y did it with a original floor shifter from a s10 but...
i am having that ptoblem with the transmission..... help me!!!! (IMG:style_emoticons/default/frown.gif) |
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Oct 22 2008, 08:30 AM
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#4
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WANTED: Avatar Title  Group: Subscribed ZR2 Owner Posts: 1,066 Joined: 30-January 08 From: Omaha, Nebraska Member No.: 5,708 |
4lo is suposed to be that way....i dont understand. is 4lo....not 4h
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Oct 22 2008, 05:24 PM
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#5
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Group: ZR2 Owner Posts: 31 Joined: 28-September 08 From: Chihuahua, Mexico Member No.: 8,090 |
yeah... its slower and stronger... i agree with that... but transmission sould make shifts like in 2hi or 4hi and it dont makes....
can anybody tell me whats going on and how can i fix it??? i would like to fix that... |
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Oct 22 2008, 06:53 PM
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#6
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What?!? I can't hear you! Group: Subscribed ZR2 Owner Posts: 5,912 Joined: 31-December 06 From: Darien, Illinois or "Chicago Suburbs" Member No.: 3,044 |
theres a thread somewere that you will need to ground a terminal from tccm. same person who made a thread on making the 233 a floor shift, but in miles's or so's thread
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Oct 23 2008, 10:00 AM
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#7
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WANTED: Avatar Title Group: Subscribed ZR2 Owner Posts: 1,066 Joined: 30-January 08 From: Omaha, Nebraska Member No.: 5,708 |
no it doesn't. mine doesn't. when i 4lo it doesn't shift out of that specific gear range
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Oct 23 2008, 10:33 AM
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#8
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Group: ZR2 Owner Posts: 492 Joined: 1-June 06 From: Marlborough, MA Member No.: 1,377 |
QUOTE (raven2510 @ Oct 23 2008, 11:00 AM)  no it doesn't. mine doesn't. when i 4lo it doesn't shift out of that specific gear range Then something's wrong with yours. |
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Oct 24 2008, 10:20 AM
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#9
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WANTED: Avatar Title Group: Subscribed ZR2 Owner Posts: 1,066 Joined: 30-January 08 From: Omaha, Nebraska Member No.: 5,708 |
no.....its 4lo. its one gear range. its all power....its not made to be driven around in....just power when you need it.
i understand what your sayin.....but it doesnt shift gears.....maybe somebody will chime in that knows more about 4x4 |
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Oct 24 2008, 11:19 AM
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#10
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What?!? I can't hear you! Group: Subscribed ZR2 Owner Posts: 5,912 Joined: 31-December 06 From: Darien, Illinois or "Chicago Suburbs" Member No.: 3,044 |
no, something wrong with your truck
my blazer DOES shifts in 4x4 low. |
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Oct 24 2008, 01:46 PM
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#11
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Group: Subscribed ZR2 Owner Posts: 1,121 Joined: 27-September 06 From: Geismar, LA Member No.: 2,444 |
let me try to help yaw
the trasmission will shift to 2nd in 4low, it is controlled through the ECCM, when using the 233 the Pccm does this when you push the button, when you change to the manual, the eccm does not know you are shifting to 4 low, so it stays in 1st, when i changed to the 231 i had to run a wire to the eccm and attach it to the wire for the trasmision, so basicly when you shift you ground out the wire when you shift. with the 233 i am not sure how you are going to do this, i have the floor console so when i pull the shifter back it has electrodes on the inside of the console the the shifter rubs against and grounds the wire to the ECCM This post has been edited by Rtrip9: Oct 24 2008, 01:48 PM |
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Oct 24 2008, 03:39 PM
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#12
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Group: ZR2 Owner Posts: 492 Joined: 1-June 06 From: Marlborough, MA Member No.: 1,377 |
QUOTE (raven2510 @ Oct 24 2008, 11:20 AM) no.....its 4lo. its one gear range. its all power....its not made to be driven around in....just power when you need it. i understand what your sayin.....but it doesnt shift gears.....maybe somebody will chime in that knows more about 4x4 Yes it's 4Lo. It's a seperate gear range in your transfer case. You clearly don't understand, it should shift gears. Somebody did chime in that knew more about "4x4." |
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Oct 25 2008, 12:52 AM
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#13
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Group: ZR2 Owner Posts: 31 Joined: 28-September 08 From: Chihuahua, Mexico Member No.: 8,090 |
QUOTE (Rtrip9 @ Oct 24 2008, 12:46 PM) let me try to help yaw the trasmission will shift to 2nd in 4low, it is controlled through the ECCM, when using the 233 the Pccm does this when you push the button, when you change to the manual, the eccm does not know you are shifting to 4 low, so it stays in 1st, when i changed to the 231 i had to run a wire to the eccm and attach it to the wire for the trasmision, so basicly when you shift you ground out the wire when you shift. with the 233 i am not sure how you are going to do this, i have the floor console so when i pull the shifter back it has electrodes on the inside of the console the the shifter rubs against and grounds the wire to the ECCM yeah i have heard about that cable that should be grounded... can you tell me wich one you attached to the transmission??? and you mean TCCM?? or what is ECCM??? |
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Oct 27 2008, 04:06 PM
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#14
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WANTED: Avatar Title Group: Subscribed ZR2 Owner Posts: 1,066 Joined: 30-January 08 From: Omaha, Nebraska Member No.: 5,708 |
no he clearly said if you shift to neutral first then put it into 4lo it doesn't shift gears
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Oct 28 2008, 09:38 AM
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#15
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Group: ZR2 Owner Posts: 492 Joined: 1-June 06 From: Marlborough, MA Member No.: 1,377 |
QUOTE (raven2510 @ Oct 27 2008, 05:06 PM) no he clearly said if you shift to neutral first then put it into 4lo it doesn't shift gears Where? |
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Oct 28 2008, 03:35 PM
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#16
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WANTED: Avatar Title Group: Subscribed ZR2 Owner Posts: 1,066 Joined: 30-January 08 From: Omaha, Nebraska Member No.: 5,708 |
i dont care any more....ive got better things to do than argue on the net
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Oct 29 2008, 09:18 AM
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#17
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Group: ZR2 Owner Posts: 492 Joined: 1-June 06 From: Marlborough, MA Member No.: 1,377 |
QUOTE (raven2510 @ Oct 28 2008, 04:35 PM) i dont care any more....ive got better things to do than argue on the net Me too. Good thing you didn't have a good argument to support your statement. |
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Oct 29 2008, 03:06 PM
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#18
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Group: ZR2 Owner Posts: 147 Joined: 17-February 07 Member No.: 3,393 |
Youre truck isnt upshifting because it isnt seeing a fast enough vehicle speed sensor (vss). Auto trans does not shift on rpm, it shifts on govenor pressure (in our case the vss) and throttle pressure (tps on our trans). If it sees a very low vehicle speed, like you will in 4 low it will never upshift.
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Oct 29 2008, 06:36 PM
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#19
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Group: ZR2 Owner Posts: 31 Joined: 28-September 08 From: Chihuahua, Mexico Member No.: 8,090 |
yeah, i understand that, but i would to know how can i fix that problem...
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Oct 29 2008, 10:16 PM
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#20
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Group: ZR2 Owner Posts: 124 Joined: 25-August 08 Member No.: 7,811 |
It is pin 16 on my main computer right by your antifreeze overflow. Mine is a 2003 that originally had a np236 autotrac, but all np231/np233/ and np236's had this feature. It should be a grey/black wire. You can attach it temporarily on the TCCM harness in the kick panel. I forgot what wire ilocation it is on there, but a basic wiring diagram will tell you what it is. When the wire is open, it has a very low power 12v signal. When grounded it tell the truck your in 4lo. But, more important than shifting, it keeps the line pressure of the trans where it should be. Otherwise, the computer is kinda confused. It see's your wheel speed is low and your throttle opening is low too due to the nature of a very low gear. You can potentially burn up clutches, particular in modifed engines and tougher offroad spots. I could also see that throttle blade mod causing even more damage to clutches. The two big things that properly set the needed line pressure is the gear it's and and the throttle position.
I know most people are catious when hacking into the computer harness and probing that fancy computer. Many people have done it here with no problems. I was more freaked out when the truck tried to shift into 2nd gear or the engine would get high into 1st without the pin connection. Was just thinking of a black and gritty tranny pan. |
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