ALO604 wrote:2010 Pathfinder. Will replacement sensors register themselves to the ECM once activated? Or is a programming tool required to the numbers into the ECM?
If one or more new TPMS sensors are replaced, they will all have to be ID registered to the TPMS control unit, which is built into the BCM. Sensors come two ways: ready to program or in "sleep mode." If the sensor you choose needs to woke-up out of sleep mode, a TPMS trigger tool is needed to do that. While not needed for the ID register process, the trigger tool does make it a lot easier and quicker and it's not expensive:
https://www.walmart.com/ip/EL-50448-TPM ... gLQPfD_BwE
There is a TPMS diagnostic connector near the OBD II diagnostic port which has a single wire going to a white, 2-pin connector; it may be taped to the harness under the dash with blue electrical tape. You can use a bent paper clip or, like me, a pin and a lead wire with alligator clips on the end, to put the TPMS system in diagnostic mode or ID register mode.
If you ground the connector and turn the key "on," the TPMS warning lamp will flash trouble codes. If you turn the key "on" and ground the connector 6 times in 10-seconds, it will go into ID register mode. With the trigger tool, start at the left-front wheel and put the trigger tool next to the valve stem and press the button on the tool. If it registers, the exterior lights will flash. If the lights don't flash, you may have a dead sensor and you won't be able to complete the process. Once the left-front is done, continue the procedure at the right-front, right-rear and left-rear, in that order. When done, turn the key "off."
If you don't have a trigger tool, you will have to adjust the tire pressures as such: left-front, 36 psi; right-front, 33 psi; right-rear, 30 psi; left-rear, 27 psi. Put the system into ID register mode, as described earlier. The TPMS warning light should be flashing. Drive the vehicle over 25 MPH until the warning light stops flashing and stays "on" steady. Stop the car and inflate the tires to spec.
There are plenty of YouTube vids on the procedure. Just search for Nissan TPMS sensor relearn:
https://www.youtube.com/watch?v=IOaoFCSVtQ8
https://www.youtube.com/watch?v=v-lI3_MDmlI