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MAF readings


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So I missed the Tech Session...and guess what I got... Yes, a CEL. :(

Took it to the RMG place and people were very very friendly and helpful. :clapping:

The fault code is related to the MAF sensor. Estimate to repair $500-$550.

Got a better price for the part @ Sunset $267 but my question is if range 1 was 0.24 and 0.25, and Range 2 were in the 1.09 and 1.11 range... Is the sensor my only problem?

Edited by scherb
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That's what you get for not going to the local tech session where the air flow sensor was mentioned. Loren was supposed to be taking notes. :lol: I have the OBD II book but I really need to read it one of these days.

I sort of remember what Peter told me a long time ago. There are TRA and FRA numbers, and maybe that is what you mean by range 1 and 2. TRA and FRA are initials for some German words. I am going to guess that this is what we commonly call fuel trim.

TRA is at idle. -10 is good and -36 is the limit. FRA is the readings above idle - do not remember if the numbers should be different or the same as TRA.

That is all I remember. Maybe someone else can help.

If you have that many miles with the original sensor then you are lucky.

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Can you post all the fault codes? and any other symptoms...

These are for most of the current cars:

Description -- Value -- Deviation

Oxygen sensing, cylinder 1 - 3 -- 1.0 -- ±0.05

Oxygen sensing, cylinder 4 - 6 -- 1.0 -- ±0.05

Range 2, cylinder 1 - 3 (FRA) -- 1.02 -- ±0.04

Range 2, cylinder 4 - 6 (FRA2) -- 1.03 -- ±0.05

Range 1, cylinder 1 - 3 (TRA) -- 0.00 -- ±0.1

Range 1, cylinder 4 - 6 (TRA2) -- 0.00 -- ±0.1

O2 sensor voltage ahead of cat. conv. -- 0.04 ≤ UL ≤ 0.79 V

O2 sensor voltage 2 ahead of cat. conv. -- 0.04 ≤ UL2 ≤ 0.79 V

O2 sensor voltage behind cat. conv. -- 0.04 ≤ UL ≤ 0.79 V

O2 sensor voltage 2 behind cat. conv. -- 0.04 ≤ UL2 ≤ 0.79 V

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TP/Loren here is what I got from the readings.

Range 2, cylinder 1 - 3 (FRA) -- 1.02 -- ±0.04 >>> 1.09

Range 2, cylinder 4 - 6 (FRA2) -- 1.03 -- ±0.05 >>>1.11

Range 1, cylinder 1 - 3 (TRA) -- 0.00 -- ±0.1 >>> 0.24

Range 1, cylinder 4 - 6 (TRA2) -- 0.00 -- ±0.1 >>> 0.25

I replaced the MAF and my CEL is still on after several Cycles... it has been 12 times I have turned on the car. :drive:

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  • 2 weeks later...

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