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Coolant temperature sensor

Tiny
JIMNY99
  • MEMBER
  • 1999 SUZUKI JIMNY
  • 1.3L
  • 4 CYL
  • 4WD
  • MANUAL
  • 100,000 MILES
Temperature gauge increasing max but engine is running correctly and not overheating. Sensor is 3 pin type and has just been changed as original failed on engine management side.
Gauge was operating correctly.
Thursday, July 2nd, 2020 AT 11:58 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

If the gauge was reading high, then it was running hot and needs to be addressed. Running it like this could cause engine damage.

https://www.2carpros.com/articles/symptoms-of-an-overheating-engine

Did you change the thermostat?

https://www.2carpros.com/articles/replace-thermostat

I also attached a wiring diagram of the cooling fans. Are they working when the engine gets hot?

Roy

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Thursday, July 2nd, 2020 AT 12:27 PM
Tiny
JIMNY99
  • MEMBER
  • 3 POSTS
Engine is not running hot. No loss of water. No other signs of overheating. Gauge was not showing high temperature before sensor was changed. Sensor is a dual type and the original was not sending correct signal to ECU. New sensor shows gauge at normal temperature when cold in morning. No other changes to the engine. I suspect incorrect sensor supplied. Engine is now running smoothly, no engine light.
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Thursday, July 2nd, 2020 AT 12:48 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, I understand but I have a question.

Why did you change the temperature sensor if it did not show high temperature before? Was there another issue?

Roy
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Thursday, July 2nd, 2020 AT 12:52 PM
Tiny
JIMNY99
  • MEMBER
  • 3 POSTS
Sensor is a 2 element type. The element going to the ECU was faulty giving an engine fault light. Fault codes were checked and the sensor diagnosed as faulty. So there was a fault on 1 element of the sensor but not on the element for the temperature gauge.
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Thursday, July 2nd, 2020 AT 1:32 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, makes sense. I just was trying to see if you had another issue.

Thank you.

Roy
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Thursday, July 2nd, 2020 AT 1:35 PM

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