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Mass Air Flow Sensor - good or bad? 850

posted by  meatfingers on  Wed Dec 5 09:27 CST 2007
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last visit: Tue Dec 11 01:44 CST 2007
[RELATED]

I have an 850 Turbo wagon and I am trying to determine if my mass air flow sensor is good or bad. This relates to a cold starting problem discussed in another thread.

Even though I do not have any error messages I suspect the MAF may be sending a faulty signal to the ECM which in turn adopts a substitute value impacting the injector period - resulting in flooding when very cold outside.

One test for the sensor stipulates while the plug is connected and key on (not running) the voltage from ground to pin #4 should be battery voltage and the voltage between pins # 2 & #3 should be .1 - .2 volts. I found both to be true.

However, ALLDATA stipulates a resistance across pins #1 & #4 should be approx. 110 ohms for the MAP.
I measure the resistance between pins #1 & #4 is approx. 735 ohms.

Does the last test mean the MAF sensor should be replaced?

David






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