Ok I'm new but bought a new sensor since it wasn't expensive after get the low temp code unhooked battery to reset the ecm after half a hr rebooked battery. Then started car got code again so went through the manual for trouble shooting tested connector got the 5v that it said it should have. My prob now is I don't know what"scanner" the manual said it uses to take temp reading. Have new ecm on the way already just in case. Any help would be appreciated thx

 

Use a vom koeo yellow wire 1.6v backprobed and will very. Might want to ohm out the yellow wire corrosion in the wire will effect voltage pin c10 at the ecm. From
ground ohms on sensor should be close at ecm and sensor.

 

It is completely possible to use a multimeter and back-probes to diagnose the sensor and wire harness.

It's also a huge pain in the ***, and it takes ten times as long as doing it the easy way.

Connect a scan tool--there's many different manufacturers and models--and watch the data stream as the engine warms up. The on-board computer will tell you what the sensor is reporting for temperature. Couldn't be easier.

There are stand-alone scan tools, and some that amount to a dongle and some software for a laptop computer. Others use a hard-wire connector from vehcle diagnositc connector to the laptop computer.

The important thing is to buy a SCAN TOOL, not a crappy "code reader". A scan tool will read codes and the data stream, and it should have some ability to command the computer to do certain things--activate the AIR system, increase the idle speed, force "limp-home" mode, etc. A code-reader reads codes; they're one step away from useless. Codes can be helpul, the data stream is essential.

A GOOD scan tool will interface with the engine computer, the body computer, ABS, instrument cluster,etc. if the vehicle is set up so that those components are intended to communicate with a scan tool.

MY scan tool is a Snap-On MTG2500, which is probably older than you are. Snap-On has multiple scan tools that are newer/better; as does OTC, and there are rebranded scan tools made by others but sold by the "Tool Trucks"; Mac, Matco, Cornwell. Then there's the consumer-grade stuff available on Amazon or eBay, or from local parts stores like NAPA, O'Reillys, AutoZone, etc.

When it was my money, I bought a professional-grade tool, used, rather than a consumer-grade tool, new.

 

I will try to find a scan tool. Searching for one for this old of a car seems to be a pain but it is what it is. Will let u know what I come up with also will be installing the new ecm