btam13
NAXJA Forum User
- Location
- Des Moines, Iowa
Ok, this is frustrating. I spent 2 hours degreasing the engine compartment on my 1990 xj, 4.0lt and now the trans will not up shift out of 1st gear when in drive. Any thoughts on this?
99SJ_Ex said:if it still doesnt work, chances are you got the TPS wet...Go buy a new TPS
Austin
X2lawsoncl said:The AW4 trans computer doesn't have a "fail-safe" mode. If it did, it definitely wouldn't be 1st gear as dropping into 1st at speed could be catastrophic. Best bet is 4th or 3rd gear. If the trans computer looses power, you get 4th gear with the shifter in (D).
More than likely the TPS sensor is wet and giving a reading that indicates it's floored and the tranny computer is staying in 1st all the way to redline.
Ecomike said:The problem is water inside the sealed TPS shorting out the variable resistor inside. Some have put thiers in a convection back oven at 250 F four hours to dry out the sensor and brought them back to life, but from the sound of it you need the DD so just go buy a new one, and then try to salvage the old one as a spare. See the thread "RenX Files" here, by "Ecomike" in advanced search for testing methods, data and calibration details.