jonathanstampf
New member
I've been trying to figure out why the jeep won't go into overdrive. 15 mpg is not doing me any good.
The O/D OFF switch is a pushbutton, with a light above it that lights when you opt for no overdrive. I pulled the wire harness off the back, and drove: no overdrive. I then connected the wires that the O/D OFF switch would close and drove: still no overdrive.
I put it all back together and noticed that the light stayed on no matter how many times I pressed the button. But interestingly, when the ignition is on the RUN position, but engine not running, the O/D OFF switch will turn that little light on and off. I think this is a key clue.
I've learned there's a little computer Transmission Control Module that tells the transmission electrically when to shift, and one fellow thinks the Throttle Position Sensor, one thing that feeds data to the TCM, could be the culprit. I checked the Throttle Position Sensor and it sends .2 - 5 volts to the TCM, depending on the position, and is $28. The TCM is $412. So you know what I'm hoping.
Any ideas? Why does the switch function not running but stays lit when running?
The O/D OFF switch is a pushbutton, with a light above it that lights when you opt for no overdrive. I pulled the wire harness off the back, and drove: no overdrive. I then connected the wires that the O/D OFF switch would close and drove: still no overdrive.
I put it all back together and noticed that the light stayed on no matter how many times I pressed the button. But interestingly, when the ignition is on the RUN position, but engine not running, the O/D OFF switch will turn that little light on and off. I think this is a key clue.
I've learned there's a little computer Transmission Control Module that tells the transmission electrically when to shift, and one fellow thinks the Throttle Position Sensor, one thing that feeds data to the TCM, could be the culprit. I checked the Throttle Position Sensor and it sends .2 - 5 volts to the TCM, depending on the position, and is $28. The TCM is $412. So you know what I'm hoping.
Any ideas? Why does the switch function not running but stays lit when running?