C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

ECT sensor

Old Mar 17, 2002 | 11:28 PM
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Default ECT sensor

Pulled the codes on my '89 and got code 15 - ECT snsor indicates low temp, or ECT sensor open. Can somebody tell me what this means and where it is? Any help will be greatly appreciated.

Thanks
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Old Mar 18, 2002 | 10:51 PM
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Default Re: ECT sensor (mayberry)

ttt
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Old Mar 18, 2002 | 11:26 PM
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Default Re: ECT sensor (mayberry)

That would be the coolant temperature sensor.
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Old Mar 18, 2002 | 11:52 PM
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Default Re: ECT sensor (mayberry)

I think you know where it is now. The question is what does it do when it goes out.

Are all your plugs tight? :D

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Old Mar 18, 2002 | 11:52 PM
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Default Re: ECT sensor (mayberry)

It's below the throttle body. Could be you knocked the wire off?

How is the car running? Anything else you can tell us?

Pete
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Old Mar 19, 2002 | 03:44 AM
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Default Re: ECT sensor (PeteL)

I know it gets it's reading off another sensor, but what does your dash temp gauge read when the car is running and warm? Is the car running ok?
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Old Mar 19, 2002 | 03:52 AM
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Default Re: ECT sensor (89 Paul in cal)

If the sensor is bad or the wiring to the sensor is bad, then the digital dash will show a wrong temperature and possibly run in open lope mode.
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Old Mar 19, 2002 | 07:22 PM
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Default Re: ECT sensor (89 Paul in cal)

The car is idling very poorly. It revs up then down. I have not checked the temp gauge yet but will when I get home. The wire is connected and the connector seemed ok. If the sensor goes out will it cause the car to run poorly like that.
Thanks

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Old Mar 19, 2002 | 09:00 PM
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Default Re: ECT sensor (Glock'94)

Car is idling around 1500 RPM now. Coolant temp got to about 185 with an oil temp of 165 while idling. I have not driven it and got it to full operating temp yet. Is there a way to test the sensor?
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Old Mar 19, 2002 | 09:20 PM
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Default Re: ECT sensor (mayberry)

That sensor has no effect on the guage, it's for the ECM.

Quick Check:

Engine off, disconnect battery negitive cable for a minute or so.
Reconnect battery
Disconnect temp sensor
Short wires on sensor harness connector together using a small jumper
Re-start car and see what code sets

14 = sensor harness OK, check connector and sensor
15= wiring harness has an open circuit

Wiring: Yellow wire +5V from ecm
Black wire = ground

Sensor test:

Degrees___Resistance (OHMS)

160_______450
100_______1,800
70________3,400
40________7,500
20________13,500
0_________25,000

HTH

Pete
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Old Mar 19, 2002 | 09:38 PM
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Default Re: ECT sensor (PeteL)

Thanks. Got a 14 so now I am going to check the resistance on the sensor and look a little closer at the connector.
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Old Mar 19, 2002 | 11:16 PM
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Default Re: ECT sensor (mayberry)

Sounds like another sensor for you. You should see if you can get a package deal. Let me know if you want some help.
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Old Mar 20, 2002 | 12:04 AM
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Default Re: ECT sensor (Black85L98)

Pulled the sensor out and shelled out the 12 bucks for a new one and my car is running great. Thanks everybody for the help.

Black85L98
Yea it would be nice if I could get every sensor on a bulk package deal. Looks like I am going to end up replacing them all anyway.
:cheers:
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