Initially, input speed sensor was replaced by a Hyundai dealer and problem stopped for ~6months...it may have had some really subtle act ups that I may have dismissed or not noticed. The problem returned , and the car acted and now acts the same as it did before the repair. This is the only problem, and I am able to drive the car. The most frequent issue occurs when starting out from a stops , such as at a light- the car won't shift out of 1st. Usually stopping and shutting engine does not fix it; it will shift eventually into 2?, 3?, then stay in that gear, even if I stop at another light. It is erratic, sometimes it behaves perfectly fine. I have no problems c distance driving, except that it does drop out of 4th sometimes when speed >60 mph..that is , if it got into 4th at all- usually it does not achieve 4th- but when it does drop out, it seems to only drop to 3rd- it's not usually a huge clunk in those situations. The biggest clunking is when stuckj in 1st. It always comes out of it tho, I've never been delayed because of it.
SOURCE: trans drops into 3rd gear won,t shift to 4th
DTC P0734 is "4th gear incorrect ratio" - that's your torque converter 'LOCK UP Clutch" It's worn out (or you're using the wrong Trans Fluid required by Hyundai - SPIII OR Both). The P1624 is simply the Trans Control Unit (computer) communicating to the Engine Control Module (ECM computer) MIL - on request signal to ECM = asking it to turn on "Check Engine" light. MIL = Malfunction Indicator Lamp. When the torque converter 'lock up" clutch slips or doesn't engage, the trans automatically returns to 3rd gear and stays there (it's called 'fail safe' mode) until you cycle the ignition key, then everything resets until the malfunction occurs again.
You'll need to have an AT (Automatic Transaxel) tester hooked up to verify this. Hyundai has a Service Bulletin specifically for "gear incorrect ratio' codes. If when you changed the trans fluid, was it done at a Hyundai Service Center? If not, someone may have installed the wrong fluid.
SOURCE: Hyundai Trajet automatic output speed sensor problem
Priced new output speed sensor €190, went to breakers yard, found similar sensor on mitsubsihi carisma, purchased €20, fitted same no problems since. Touch wood!
SOURCE: i have had my tiburon less than a year but about a
the trans computer has seen a problem possible a bad sensor, or an internal problem, and puts it into a safe mode, or limp home mode , it wont shift , it will stay in 3rd gear, this way this reduces the possibility of further damage trans damage, when you turn the ignition off and back on it resets the tcm, my advice is to take it to your local dealer, they can diag your trans as they know the product, i dont advise pep boys, or discount auto parts.
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