4g61t.org

Looking at an easy way of testing the Baro circuit in a MAF sensor.

Is there a simple DVOM test that can be performed to get a result that will prove if the MAF sensor is in spec?

We have a member here that has a MAF throwing a CEL for the Baro circuit, wiring is apparently testing good back to the ECU pins.

Anyone encountered and diagnosed the failure definitely without just swapping a different sensor in place?

This may not be completely relevant, but I always used a pocket logger to watch the Baro info. I can recall at least once, if not twice that the Baro numbers went crazy, as well as the intake temps right before my ECU capped out.

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49 International KB-2
72 Dodge Colt
73 Dodge Colt (Project)
84 GMC K3500
85 Dodge D50 Diesel Swap
90 Mighty Max V6
89 Mirage Turbo
94 Mighty Max
99 Montero

Very true.

The guy we're helping is in Malta, and has to have the car serviced by a tech there.

This is the attempt to glean some info without a logger.

On my car I had this problem and it turned out to be a bad connection in the MAF plug, bent and/or corroded.
Wiring tested good back to the ECU pins and another MAF gave the same results.
This has also happened to me while trying to chase down a fan problem (bent and/or corroded relay connection) and
with the coil pack transistor(or whatever it's called).

Hope this help, i have skipped the N/T and DRBII information
Let me know if you want more scan pics ...

Excellent information, thanks!

If I have time tonight, I'll build a test rig and get some real world numbers.

... they'll be from 9200 feet in altitude, but I should be able to see if there's any life in the unit.

Thanks again!

I think i have maybe more checking information at my garage.
Have you a Turbo car ? Procedure are different than N/A model ...
Check engine code or not ?

Every time I've ever had that error its been the ECU. Not saying they don't go bad but I'd bet its the ECU.

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93 Mitsubishi Expo LRV 1.8/manual
95 Eagle Summit DL Coupe 1.5/manual
01 Mitsubishi Mirage ES Sedan 1.8/manual

ColtiXim, thanks for the reply!

FWIW, This is not for my car, it's for the nemisis swap that's in Malta.

(Tim came over to the Galantvr4.org board to ask for assistance / input on the interchange and I followed the conundrum over to this board.)

As near as I can tell, the airflow meter will need to interface with an early jdm vr4 wiring harness / ecu.


I am a little curious about the "doppleganger" green/yellow wires used in the maf plug.

I can see how the ecu would be confused by the wrong signal input if those wires were swapped during harness repairs/ work.

... sure would like to kick the beancounter that thought it would be okay to use green/yellow wire throughout the engine harness squarely in the sack!

89Mirageman, my experience has been that the baro side doesn't fail often, but when it does, it fails open and the ecu will use a "default" (which I *believe to be sea level readings.) In the case of a car at sea level, it's not such a big problem, but up here at 9200ft in Colorado, it'll result in a total pooch and some toasty egt's, as the timing will be not be advanced and the fuel trimmed back to compensate for the "thinner" air.

Holy Cow guys!

This is exactly the type of information we were needing.

I took some manuals to work but never got them open, they are the Pair of manuals I was looking at putting up for sale, or they might already be listed.

I see stuff like this at work, but this is all vintage era stuff. Haha.