The Top DSM Community on the Web

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. Log in to remove most ads.

  • Join the Community!

    DSMtuners is a massive archive of DSM information - but more importantly, it's a COMMUNITY! Join in and participate with other DSMers, and invite all of your DSM friends to make this place their home. Chat with others, create a build thread, post questions and answers. Get involved! Logging in will also remove many of the advertisements, along with this notice. ;) It will also allow you to view images in threads.

Please Support ExtremePSI
Please Support ExtremePSI

420A Coolant Temperature Sender Values?

97egl

Proven Member
211
60
Feb 6, 2014
Brownsburg, Indiana
Have an issue with hard starts and running rich when hot (Anywhere from 200-230)

Trying to eliminate things. Unfortunately I have a 95 and my scan tool will not read anything on 95's so I'm trying to test the resistance of the ECT old school with an ohm meter. Does anyone know the values it should have. I'm getting (This is a 95 non-turbo)

190- 1 K ohms
140- 2.2K ohms
120- 4K ohms
 

Mello

Proven Member
1,288
445
Jul 4, 2003
Albuquerque, New_Mexico
Did you try using your scan tool? All 95 model years Eclipse's were built compliant to the 96 ODBII standards. If your scan tool works for 96's I would think it should work on a 95 Eclipse. Just curious if you actual tried connecting your scan tool.

This is what the FSM shows-
You must be logged in to view this image or video.
 

1995TalonMT

Probationary Member
16
7
May 20, 2020
Walls, Mississippi
I removed my sensor to test it a few years ago. I measured resistance with the sensor in boiling water on the stove (212 deg. F) and in Ice Water (32 deg. F). The resistance was way off per the values in the Manual for that temperature. I'll see if I can upload the values from my Haynes Manual had for various temperatures. The ECU uses coolant temperature as one of the inputs for determining proper Fuel delivery and Air/Fuel ratios. FYI I have a 420A (1995 Talon). I purchased a new sensor on Rock Auto for replacement. I hope this helps.
 

97egl

Proven Member
211
60
Feb 6, 2014
Brownsburg, Indiana
Thanks for the replys. I plugged the scan tool in but get nothing. I had issues with another 95 as well not connecting but have had it connected to a 97 and 99 no problem as well as dozens of other cars.

Thanks for posting the FSM values. It looks like I am a bit lower on high temp side but can't get it above 190 without running it on the track so looks like ill just have to try and make sure it doesn't stall out. Race is tommorow so I don;t have time to mess with it at this point.

Again appreciate the help guys!
 

dustyboner

DSM Wiseman
1,411
654
Mar 13, 2016
abq, New_Mexico
the intake air sensor and coolant temp sensor use the same thermistor. that means if they are both at ambient temp, they will have the same resistance.


You must be logged in to view this image or video.
 

97egl

Proven Member
211
60
Feb 6, 2014
Brownsburg, Indiana
Thanks for the chart dusty! Do you know which column is which sensor? I was going to pull both sensors and boil them in an old pot to check them as I am still having issues with the car dying if it drops below 3,000 rpm once the temp gets over 200.
 

dustyboner

DSM Wiseman
1,411
654
Mar 13, 2016
abq, New_Mexico
the sensors use a 10K NTC thermistor.
the middle column is the values for a type3 sensor and the right column is the values for a type 2 sensor. Im not sure which type the sensors are cause the service manual specs are within the range of both types


You must be logged in to view this image or video.
 
Support Vendors who Support the DSM Community
Boosted Fabrication ECM Tuning ExtremePSI Fuel Injector Clinic Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications MyMitsubishiStore.com Raven Fabrication RixRacing RockAuto RTM Racing STM Tuned VR Speed Factory

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds

Top