FIAT Doblo - Fiat 1.3mjet EGT sensor

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Sun 23 Jul 2017 15:15
FIAT Doblo - Fiat 1.3mjet EGT sensor - 3uga

Hi!

Recently had an error on my car, wich says egt sensor short circuit.

Found the conection to the sensor and got a resistance test. At first 3.5Mohm and slowly rising. From what I can tell, sensor is faulty jut by not holding a stable resistance.

Can anyone tell me what resistance I'm suposed to look for?
At cold, a ford focus 1.6 tdci measures up to 1Mohm (0.954 Mohm) and keeps it stable.
I've heard there are some sensors that go even at 10Mohm at cold.

Edited by 3uga on 23/07/2017 at 15:16

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Sun 23 Jul 2017 17:08
FIAT Doblo - Fiat 1.3mjet EGT sensor - Railroad.

3.5 megaohms (3,500,000 ohms) is as near as you can get to open circuit. If your fault code says the circuit is short circuit you should check the wiring. A short circuit should read 0 ohms between the positive side and earth. Don't forget that when checking resistance the component must be out of circuit, in other words disconnected from the system.

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Sun 23 Jul 2017 17:09
FIAT Doblo - Fiat 1.3mjet EGT sensor - hardway

I'd be thinking it would't have a stable "R"

it is a temperature sensor so resistance must vary with the exhaust temp.

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Sun 23 Jul 2017 22:39
FIAT Doblo - Fiat 1.3mjet EGT sensor - 3uga

Resistance was measured on cold engine(not used for 3 days).
EGT sensor starts with resistance 3.5Mohms and slowly climbs up 9, even 11 sometimes. No temperature change was present.

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