Fault Code P0118 (engine coolant temperature circuit high input)

Tiny
MB-POWER
  • MEMBER
  • 2011 TOYOTA AVALON
  • V6
  • FWD
  • AUTOMATIC
  • 89,050 MILES
Coolant sensor and thermostat has been changed, but same problem still. Check engine light on. Auxiliary fan working all time with ignition, temperature indicator not working.

many times fault code cleared but it is back again after we start engine!
any help please.

thanks
Wednesday, August 30th, 2017 AT 9:14 AM

6 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
If you are sure you changed the correct sensor, then you likely have an issue with the plug or the wiring. The dealer probably sells a new pigtail for the wiring that you can splice it to change the plug.
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Wednesday, August 30th, 2017 AT 10:17 AM
Tiny
STEVE W.
  • MECHANIC
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Unplug the sensor, clear the code and try starting the car. You should get a different code now. If you also get or only get the P0118 code you have a wiring problem, namely a short to voltage on the sensor wiring.
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Wednesday, August 30th, 2017 AT 3:16 PM
Tiny
MB-POWER
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Good morning
Done and got the same code.
Wire from ECU to sensor has been checked and found okay.
Do you think it's because of the ECU it self?
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Wednesday, August 30th, 2017 AT 11:46 PM
Tiny
STEVE W.
  • MECHANIC
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Looking at the wiring diagram and the sensor specs I would double check that the wiring from the sensor to the ECU is good, an internal break in either wire can cause this code. One wire will have five volts one will be ground with the key on.
If you do not find those then I would suspect the ECU.
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Thursday, August 31st, 2017 AT 12:43 PM
Tiny
MB-POWER
  • MEMBER
  • 80 POSTS
ECU has been replaced and it's okay now.
Thanks
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Thursday, September 21st, 2017 AT 12:00 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 52,185 POSTS
Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help

Cheers, Ken
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Friday, September 22nd, 2017 AT 11:00 AM

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