2001 Hyundai XG300 High Fuel Consumption

Tiny
CONQUEROR
  • MEMBER
  • 2001 HYUNDAI XG300
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
I owned a hyundai XG 300. At the moment when I start the car in morning, it wont start. I will have to go and Unplug the Temperature Switch Sensor before it start running. After running, the engine runs bad but if I unplug the MAF plug it run better. Now it consumes more fuel. I tried to diagonis the ECU, so its bring out the following code: P0115, P0113, P0102, P1159, P1632, P1520, P1191, P1193, P0325. Please what do I do now?
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Friday, May 23rd, 2014 AT 2:12 PM

26 Replies

Tiny
SATURNTECH9
  • EXPERT
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?
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Saturday, May 24th, 2014 AT 6:56 AM
Tiny
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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.
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Saturday, May 24th, 2014 AT 7:58 AM
Tiny
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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.
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Saturday, May 24th, 2014 AT 10:17 AM
Tiny
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Yes I do. But Hw do I do d reading? There 3 pins!
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Saturday, May 24th, 2014 AT 10:32 AM
Tiny
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There you go let me know what you find.
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Saturday, May 24th, 2014 AT 9:29 PM
Tiny
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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.
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Sunday, May 25th, 2014 AT 2:31 AM
Tiny
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  • EXPERT
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.
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Sunday, May 25th, 2014 AT 7:44 AM
Tiny
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Really! So there should be resistance / continuity between the black/white & green wire? They should be connected somehow, right?
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Sunday, May 25th, 2014 AT 8:29 AM
Tiny
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. But there's continuity between the green wire @ harness and d green wire at d PCM connector. So there was no open between.
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Sunday, May 25th, 2014 AT 8:33 AM
Tiny
SATURNTECH9
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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.
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Sunday, May 25th, 2014 AT 8:53 AM
Tiny
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Ok. I'll get back to u.
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Sunday, May 25th, 2014 AT 9:14 AM
Tiny
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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?
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Sunday, May 25th, 2014 AT 11:29 AM
Tiny
SATURNTECH9
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Have you checked to see what the ohms reading is from the coolant temp sensor connector end back the pcm connector?
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Sunday, May 25th, 2014 AT 4:27 PM
Tiny
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Will I do that with the jumper wire as well?
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Sunday, May 25th, 2014 AT 7:14 PM
Tiny
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Your not jumping anything your just checking the resistance of the length of the wire from end to end.
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Sunday, May 25th, 2014 AT 7:42 PM
Tiny
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I have done the reading, I got 5.9 ohms from end to end.
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Sunday, May 25th, 2014 AT 10:48 PM
Tiny
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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.
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Monday, May 26th, 2014 AT 5:33 PM
Tiny
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I got 0.03 volt
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Monday, May 26th, 2014 AT 11:28 PM
Tiny
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Now with the key in the run position check that same wire the same way by back probing the wire at the pcm.
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Tuesday, May 27th, 2014 AT 6:17 AM
Tiny
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Ok. I'll feed u back soon.
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Tuesday, May 27th, 2014 AT 6:49 AM

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