Question about Nissan Frontier
Posted by Anonymous on
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Posted on Jan 02, 2017
juan: there is a cable which comes from the transmission to the throttle linkage. This is called the TV (throttle valve) cable. This is designed to work in conjunction with the position of the throttle. I'm sure you heard the term "KICK DOWN SWITCH". Well this essentially is doing the same thing. If the cable is out of adjustment, it will have a tendency to want to downshift into 3rd.
Even though overdrive is electrically actuated, it can be disengaged by the throttle position.
There is also a coolant temp sensor which keeps the transmission from shifting into overdrive until the coolant temperature reaches a certain point. The sensor tells the ECM to tell the Solenoid it's ok to supply a ground to it.
Your overdrive switch provides a ground to actuate the overdrive solenoid. Make sure the switch has a solid ground serving the circuit.
The torque converter solenoid picks up it's ground from the ECM.
Both solenoids are served by the same power source which is a switched circuit through the ignition.
I hope I have shed some new light on your problem and given you some new direction in which to look. I hope I have helped you resolve your problem. If not, I'll be watching and will be ready to offer more help if needed. ..mybunkey
Posted on Apr 16, 2009
what is wrong with the trans? i would start with checking your coolant in radiator and overflow bottle. let truck cool off and check coolant. make sure its nice and clean and green in color. not milky white. start there and let me know. we have seen radiator issues where coolant mixes with trans fluid and destroys trans. other than that those transmissions are pretty bullet proof. if your coolant is milky color, then that is a big problem. you will need new trans and radiator replaced. and to answer your question, the solenoid pack is inside of the transmission bolted to the valve body. you will need to open the unit from the bottom and replace solenoid pack.start with checking coolant first.
Posted on Sep 18, 2012
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