How to Replace the Coolant Temperature Sensor on a Toyota 34L V6

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How to replace the coolant temperature sensor for the ECU on a Toyota 3.4L V6. This engine is found on different Toyota models, however the truck I’m working with here today is a 2001 Tacoma. Typically a faulty engine temperature sensor will cause an increase in fuel economy, running rich which is shown by black smoke from the tailpipe, and in a severe situation you’ll have a check engine light. #toyota #toyotatacoma #toyota4runner • Website: http://4diyers.com • Patreon: / 4diyers • Facebook: / 4diyers • Google Plus: https://plus.google.com/+4DIYers • Twitter: / 4diyers • Instagram: / 4diyers • Tumblr: / 4diyers • Pintrest: / 4diyers • Tools/Supplies Needed: • -3/8” drive ratchet • -10mm deep and shallow socket • -standard screwdriver • -four new fuel rail crush washers • -temperature sensor • -17mm wrench • -20mm deep socket • -6 inch extension • -19mm deep socket • Procedure: • Ensure the engine is cold as you’ll be working around components which will be hot. When facing the engine, it’s on the left side under the front of the fuel rail behind the timing belt cover. • Loosening and removing the gear clamp on the upper radiator hose. Slide the clamp back so it won’t interfere with the timing belt cover. Remove the spark plug wire clips. One clip on the far left side has tabs that will need to be depressed and then push it out of its location. The other clips are removed by slipping your finger under the timing belt cover, then separate the clip and push it off the rear. • Using a 3/8” drive ratchet with a 10mm deep socket, remove the bolts on the timing belt cover. Most of the bolts can be accessed with the deep socket. For the bolt on the left side of the radiator hose, use a shallow socket. The lower bolt on the left side of the cover will have an electrical connector in the way and you can slide that off the clip. • Pull the timing belt cover back. This is also a great time to inspect the condition of your timing belt. • Press the tab on the side of the electrical connector and remove it from the sensor. Unfortunately, the sensor still can have direct access with a socket, the connection line between the two banks of the fuel needs to be removed, but not fully. • There will be some fuel present in the lines, you can pull the fuel pump relay, then turn the engine over to relieve some of that fuel and pressure. Loosen the 17mm banjo bolts using a wrench. Then only remove the banjo bolt on the sensor side. These connections have two crush washers on each side and they will need to be replaced, so four in total. Crush washers are intended to only have a single-use. • To remove the sensor, the one currently in the truck is a 20mm and a deep socket is needed. A 6 inch extension can also be used. • Remove the sensor, there will also be a crush washer which needs to be removed too and the new sensor should have a new washer. • As you can see, here is the new sensor. Using the new sensor as an example, while I am doing a dry test, a coolant temperature sensor should be tested in hot water with a specific temperature. Based on that temperature, you will see a specific resistance rating. Based on this chart, you’re able to see what the resistance rating is at a certain temperature. • Another way of testing the sensor or circuit is by using an OBD2 code reader which can monitor live data. While the vehicle is warming up, you should see the temperature of the engine increasing. However, this doesn’t test the sensor specifically but instead the whole circuit. • The new sensor also has teflon tape preinstalled. • Install the new sensor, this time around it uses a 19mm deep socket. The torque specifications for the sensor is 14ft lbs or 20nm. • Reconnect the electrical connector for the sensor. • Reinstall the connection on the fuel rail, make sure those new crush washers are installed, there is two on each bolt which does on both sides of the connection. Crush washers can be purchased online, at the dealer, your local parts store, farm equipment, or hydraulics supplier. The torque specifications for these bolts are 25ft lbs or 34.3nm. • Reinstall the timing belt cover with the 10mm bolts. • Reinstall the clamp for the coolant hose and tighten. • Clip-on the spark plug wires. • Start the engine and finally check for leaks around the sensor, fuel rail, and coolant hose. If leaks are found, make adjustments as needed. • Thank you to all those who watch my videos and support my content. Don't forget to subscribe to my channel for future tutorial videos and like my video if you found it helpful. New videos are always being uploaded every week! • © 4DIYers 2013 • All Rights Reserved • No part of this video or any of its contents may be reproduced, copied, modified or adapted, without the prior written consent of the author.

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