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Temperature sensor and ECM

Tiny
CID6688
  • MEMBER
  • 2015 KIA RIO
  • 1.2L
  • 2WD
  • MANUAL
  • 607,880 MILES
Description of Problem: I scan. P0118 KIA - engine coolant temperature sensor 1 circuit high input. Well, sir, my cooling fan has broken down. Now I replaced a new assemble cooling fan when I started the engine simultaneously with the cooling function it did not trip off. The A/C was not cool too. Even the temperature gauge is not working. Now I replaced the new temperature sensor. I still have the same result. The other mechanic said the engine computer module might be faulty. Then by checking the ECM there is only 3.28 voltages on the ECM going to the temperature sensor and there is nothing like continuity connection. Sir it is possible the ECM is so broken sir. Thanks
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Friday, February 2nd, 2018 AT 6:24 PM

16 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, there is supposed to be a five volt signal sent to the sensor and the other wire is the return to the ECM.

If the connector does not have five volts, then I would check the ECM connector in the attached diagram. If the five volts is not present at the output of the ECM, then yes, it needs an ECM.

Roy
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Saturday, February 3rd, 2018 AT 5:16 AM
Tiny
CID6688
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Sir, I check the ECM but there is only 3.28 voltages on the ECM. Is that enough?
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Saturday, February 3rd, 2018 AT 6:29 AM
Tiny
ASEMASTER6371
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No, five volts is what the reference voltage should be.

If you only have 3.28 volts, then the ECM has failed.

Roy
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Saturday, February 3rd, 2018 AT 6:33 AM
Tiny
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Okay sir, thank you so much.
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Saturday, February 3rd, 2018 AT 6:36 AM
Tiny
ASEMASTER6371
  • MECHANIC
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You are welcome. We are here to help.

Roy
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Saturday, February 3rd, 2018 AT 6:37 AM
Tiny
CID6688
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  • 9 POSTS
Last question sir. Can ECM be repaired?
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Saturday, February 3rd, 2018 AT 6:39 AM
Tiny
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No, you need special equipment for that. You need a new ECM, then it needs to be flashed or programmed to your car and keys.

Roy
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Saturday, February 3rd, 2018 AT 6:41 AM
Tiny
CID6688
  • MEMBER
  • 9 POSTS
Hi sir. I have a question again. If the temperature sensor's voltage dropped, will it affect the aircon as well?
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Saturday, February 3rd, 2018 AT 7:20 PM
Tiny
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No, not at all. The only time is if the engine is severely overheating, the compressor will be disabled.

Roy
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Sunday, February 4th, 2018 AT 5:34 AM
Tiny
CID6688
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How about the temperature gauge and the cooling fan? Will they get affected if ECM voltage drops?
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Sunday, February 4th, 2018 AT 5:45 AM
Tiny
ASEMASTER6371
  • MECHANIC
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If the ECM voltage drops to the ECM, then nothing will work correctly.

A scan tool that reads OBD1 systems can read these voltages.

Roy
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Sunday, February 4th, 2018 AT 7:08 PM
Tiny
CID6688
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  • 9 POSTS
Hi sir this is my ecu faulty with parts #39117-03012
And I replace defferent parts # 39117-03002
It is ok for my car?
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Wednesday, February 7th, 2018 AT 4:00 AM
Tiny
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No, the numbers must be the same. If you install the other one, it may not work at all.

Roy
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Wednesday, February 7th, 2018 AT 4:02 AM
Tiny
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Thank you sir roy, I can not buy it here in our area. Need to buy online
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Wednesday, February 7th, 2018 AT 4:11 AM
Tiny
ASEMASTER6371
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Ok,
Check this site. Www. Car-part. Com
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Wednesday, February 7th, 2018 AT 4:37 AM

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