Hi everyone, great forum, this is my first post...
I have a 96 XJ and the transmission is stuck in first gear so I'm trying to work out the cause of the problem. There is no check engine light and no error codes on my OBDII scanner. I've checked the fuses under the bonnet and the transmission oil level seems fine although it may be a little too full.
I've unplugged the TCU and can manually change through the gears so I assume the hydraulics/mechanical aspects of the transmission are good.
1. Could a faulty TPS be the cause? I recently replaced this sensor but drove through a lot of water yesterday. The problems only started today and now the engine seems to be running a bit rough on start up.
2. Can a faulty NSS cause the transmission to stay in first gear? I don't have any problems cranking it over in Park or Neutral and the reverse lights are OK. Would these be playing up too if the NSS was at fault?
3. Solenoids?
Any idea what to check first? I came across the article below so will probably check the voltages at the TCU against the chart on page 3 of the article (Figure 3):
http://www.transonline.com/transdigest/magazines/1997-10/Shift Pointers/index.html
Are these readings taken with the TCU connected or disconnected? Is this the best place to start fault finding? Any other suggestions?
I have a 96 XJ and the transmission is stuck in first gear so I'm trying to work out the cause of the problem. There is no check engine light and no error codes on my OBDII scanner. I've checked the fuses under the bonnet and the transmission oil level seems fine although it may be a little too full.
I've unplugged the TCU and can manually change through the gears so I assume the hydraulics/mechanical aspects of the transmission are good.
1. Could a faulty TPS be the cause? I recently replaced this sensor but drove through a lot of water yesterday. The problems only started today and now the engine seems to be running a bit rough on start up.
2. Can a faulty NSS cause the transmission to stay in first gear? I don't have any problems cranking it over in Park or Neutral and the reverse lights are OK. Would these be playing up too if the NSS was at fault?
3. Solenoids?
Any idea what to check first? I came across the article below so will probably check the voltages at the TCU against the chart on page 3 of the article (Figure 3):
http://www.transonline.com/transdigest/magazines/1997-10/Shift Pointers/index.html
Are these readings taken with the TCU connected or disconnected? Is this the best place to start fault finding? Any other suggestions?