2001 Hyundai XG300 High Fuel Consumption

When you unplugged the coolant temp sensor and maf you set codes.You need to clear the codes and not unplug anything and see what codes come back.If you have to unplug the coolant temp sensor for it to start youhave a bad coolant temp sensor or a issue with the fuel mixture that unplugging it helps it start.Do you have a scan tool that can read live coolant temp data?

Thanks for your prompt answers. I use to clear d codes when ever it appears. But it won't start if d car is parked for a long time(7hrs or more)....but if d engine is warm enough it can start with it plugged. I don't ve dat tool that can read coolant temp data.

It sounds like you could have a bad coolant temp sensor starving the engine for fuel when its cold and when you unplug the sensor it reads colder and starts. A cold engine needs more fuel then a hot engine. But without being able to read the temp readings on a scan tool its hard to say.Do you have a multi meter to do some testing? If so I can try to find some ohms reading for the sensor.

Yes I do....but Hw do I do d reading? there 3 pins!

There you go let me know what you find.

The volts is less than 1 volts. Thereafter, I checked resistance between d green wire @ d harness & d PCM. Hereafter, I got dat d ohms is 0.1 ohms. Thereafter, I checked for continuity btw d green wire & ground but there was no continuity. What do I do now. Since I didn't get 5.0volts as stipulated.

If you got a open between the green wire and ground it tells you to repair the open in green wire between the connector and pcm.

Really! So there should be resistance / continuity between the black/white & green wire? They should be connected somehow, right?

.....but there's continuity between the green wire @ harness and d green wire at d PCM connector. so there was no open between.

Please read the trouble tree again it says is there less then 2 ohms between the green wire at the coolant temp sensor connector and ground you said there wasnt so read on the next step of the trouble tree repair open from connector to ecm.

Ok. I'll get back to u.

I have followed the process again. I got 17.1 ohms. I also check for continuity btw ground and green wire @ d PCM...but there was no continuity. please, how do I check and repair the open in the green wire?

Have you checked to see what the ohms reading is from the coolant temp sensor connector end back the pcm connector?

Will I do that with the jumper wire as well?

Your not jumping anything your just checking the resistance of the length of the wire from end to end.

I have done the reading, I got 5.9 ohms from end to end.

Alright lets do this ground the black lead of your meter to negative side of your battery then use your red lead to measure the voltage on the black and white wire at your coolant temp sensor connector with the key in the run position.

I got 0.03 volt

now with the key in the run position check that same wire the same way by back probing the wire at the pcm.

Ok. I'll feed u back soon.

....but where is the Black/white wire @ d PCM?

I will find the wire diagram when I get a chance.

Ok. Thanks

I see pin 17 on the pcm is the green wire.

....i thought u said it is d pin 4. Is d green wire d 17th pin on d C44-2 PCM?

I never said pin 4 its pin 17 at the pcm I dont see the connector number it only shows it as a green wire.