oil in ecu socket

jdandcoke said:

pulled the pipes off. all look ok. found a video on how to test the sensors but i dont have a thaco to read it so i guess ill just have to change it and see what happens

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Shifty1962 said:

The MAF sensor (mass airflow sensor) is merely an element that is heated until it glows hot. The cold air being drawn in via the air filter flows across it and cools the element down. The current required to maintain the element at a pre determined temperature is what the ECU measures.
Most MAF sensor failures are because the element has gone open circuit. You can test the element with a multi meter.

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jdandcoke said:

ill give it a try but i was goning by a video which shows a signal comes out of the third terminal, if it is tapped on the top and it changes the its in the way out

here is the vid
How to test and replace mass air flow sensors | Video « Wonder How To

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Shifty1962 said:

Interesting. I was not aware of the pulsed output which the ECU can obviously measure. Maybe the guy that explained it to me regarding current used to maintain a pre set temperature was wrong. I've learnt something today. Maybe he meant pulses produced to maintain the heating element temperature?

Both of the MAF sensors that I have had go bad were open circuit on the heating element between the + and - neg terminals. Its a bit like a light bulb filament which gets brittle over time until the slightest knock breaks it. One was on my defender and the other on my wife's Volvo.

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