mu help please
Posted: Thu Jul 24, 2014 3:10 pm
hi there we have just brought a mu the mrs wants to get into a bit of 4x4ing as well now after a day or to i have noticed that it goes up gears fine but if you button of the gas the revs drop right down straight away then wen you put ur foot back on it there is no pull until the revs then jump back upto the revs that correspond with the speed then it will boggie agane i was thinking speed sensor after abit off research any help or advice would be i also found this on the net also
(It can cause problems but not what you're describing. It seems to me that the clutch pack is faulty or you need to check the transmission fluid level.
The faster the wheel spins, the faster the frequency the wheel magnet moves past the sensor thus the higher speed reading on your speedometer. The vehicle speed sensor counts the revolutions of the transmission output shaft. For a given vehicle, the Transmission Control Module considers a certain number of revolutions to equal a mile. A defective speed sensor can either set off the "S" light or fail to engage the cruise control, which also can affect other system controls. The result is that the TCU thinks the vehicle is running at zero speed from what it’s actually doing. The first thing you notice is an intermittent speedo reading then followed by a transmission error code after decellerating from a moderately high speed. The error codes will reset after every ignition off/on cycle.
Will the transmission shift normally to all gears (1-4, plus lockup) when the speed sensor is broken or removed?
Yes. The transmission will shift up as usual. The VSS is mainly required for a proper downshift such as for descending from a hill. It will also shut off the engine if the speed is excessive. A failed VSS often won't create a limp mode. But most TCU's may go into a "limp mode" when there is a detected fault. The limp mode is usually mistaken for a transmission problem when the transmission refuses to shift. Please check for a stored code)
so am thinking this is the problem any advice is much appreciated
(It can cause problems but not what you're describing. It seems to me that the clutch pack is faulty or you need to check the transmission fluid level.
The faster the wheel spins, the faster the frequency the wheel magnet moves past the sensor thus the higher speed reading on your speedometer. The vehicle speed sensor counts the revolutions of the transmission output shaft. For a given vehicle, the Transmission Control Module considers a certain number of revolutions to equal a mile. A defective speed sensor can either set off the "S" light or fail to engage the cruise control, which also can affect other system controls. The result is that the TCU thinks the vehicle is running at zero speed from what it’s actually doing. The first thing you notice is an intermittent speedo reading then followed by a transmission error code after decellerating from a moderately high speed. The error codes will reset after every ignition off/on cycle.
Will the transmission shift normally to all gears (1-4, plus lockup) when the speed sensor is broken or removed?
Yes. The transmission will shift up as usual. The VSS is mainly required for a proper downshift such as for descending from a hill. It will also shut off the engine if the speed is excessive. A failed VSS often won't create a limp mode. But most TCU's may go into a "limp mode" when there is a detected fault. The limp mode is usually mistaken for a transmission problem when the transmission refuses to shift. Please check for a stored code)
so am thinking this is the problem any advice is much appreciated