Won't shift onto overdrive until engine warms up.

look for knock sensor codes in the history on the engine computer

hello, first you need to make sure the engine gets to operating temperature, maybe the thermostat needs to be replaced, if after that it still has the same problem the temp sender could be the issue here. It is located on a housing in between the cylinder heads near the firewall where the heater hose connects. there are two temp sensors, one for the gauge on the dash and one for the computer.
The dash sensor has a single wire, the computer temp sensor has a connector with two wires and is a green connector.

This is normal on newer vehicles. The transmission temperature is monitored and overdrive is held off until the transmission is up to temp. Nothing unusual or wrong with this. My Tundra does the same thing. The trans temp gauge gets to about the 1/4 mark before the overdrive kicks in.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Hello. My name is Toyota Ed. Please allow me to assist you.

The truth is, your Paseo is working properly.

To lessen emissions, Toyota does not allow the overdrive to engage until the engine temperature reaches 177 degrees F.

The "OD allowed" temperature is determined by the coolant temperature sensor on the engine. This sensor prevents the computer from allowing the OD to engage until the 177 degree threshold is met.The warmer the coolant is, like in the summer, the faster the 177 degree plateau is reached. In colder temps, like in winter, it takes much longer for the coolant to warm up to the desired temperature, thusly taking longer to shift into OD.

If the overdrive engaged before 177, cold-engine emissions are more abundant.

There is nothing that can be done to change the point at when the OD is permitted to shift.

So, your car is in excellent working condition. Nothing to worry about, now that you understand the basic design.

Thank you very much for choosing FixYa for assistance today. I hope that my input proves useful to you. If so, a 4-thumbs up rating form you would be greatly appreciated.

Have a great day.

The overdrive switch allows you to manually keep the transmission from going in to OD. This can be usefull when driving up steep grades and the transmission has to continually down shift for better engine torgue. Also very useful when towing a trailer to keep the engine RPMs up for better towing ability. The transmissions on the cars also use a temperature switch, here in WI the car (with Mitsubishis) will not shift in to OD until the engine meets a given temp. If your temp switch has failed the tranny cannot go in to OD, there should be a OD relay too which should be inspected and lastly the OD solenoid which engages the OD, if it failed no go. Also be certain to keep your tranny oil in top form with the Mitsubishi's, their trans-axels are quite sentitive to failing tranny fluid (poor viscocity) if the fluid is old/dirty good practice to go ahead and replace it with filter.

I hope this may have assited you,
Tom

Calvin...... You need to treat your Jeep to a new THERMOSTAT. The Overdrive is connected to the engine coolant temperature and if the engine is n ot warmed up properly, the Overdrive will not engage. Try to get a thermostat from the Jeep dealer so you will have exactly the right one, some of the cheapoie ones will not work right. Dave in Iowa

you have a shift solenoid sticking

You have two temperature lights that come on when you start the car, one red and one blue. After the car is started the red light goes out and the blue one stays on. According to the manual, (and from my personal experience with my '03 SX), the car needs to warm up to a proper operational temperature. This temperature is reached once the blue temperature light turns off, (or within seconds afterwards). If you don't allow your car to warm up you will notice hard or long shifting, rough idle, and poor engine performance. Never drive your car if the light displays a constant red temperature light.
If this solution does not work see a Transmission expert of take it to your local Suzuki Dealer.

time for rebuild

I had a similar problem with my 98 mystique when i bought it used. I had no overdrive and was lucky to find a honest transmission shop that found the problem. In my case the overdrive was unplugged. They plugged it back in,cleared the computer and changed my tranny fluid and i was good to go. You should be revving about 2400rpm at 65mph. The other thing you can check is to make sure that the wires that go from the overdrive button are not broken off or coroded.