Low 5v ref

[fixkick]

Hey thanks mr. Been lookn at your stuff for awhile. Ok your right is a 92. No iat sensor. I cut the wire back of ecu to take that guy out of equation. Yes the ecu will read exact same vol completely unplugged from the harness and gator clipped to batt on those 4 pins. Like I said takes a week or more for the vol to come back on one of my ecus??  Last time I ran it with the maf unplugged for a few days.  Never showed low ref vol. just dropped off one day driving down the road. Time before ran for 3 weeks. Then lost the 5v sitting there idling. Um. Do you think the ecu that I’m using that keeps coming back up to 5v ish. 4.8 right now.  Is bad? The other one is shot to H3ll. It crapped out bfo I found the bad maf. Thought I tested it but missed it somehow. Oh and my maf is a real one jus bad. Thanks for the info on the China crap ?.
My pin 1 reads -.35  this is wrong. ,this means MAF has no 12vdc power, and is wrong.
And it is a manual transmission. 5SP M/T SURE. and very good to have.

        Thanks!

+5VREF PIN IS SPEC, 4.75 TO 5.25V

ONLY 3 Things make it fail for low.
bad sensors. (shorted)_
shorted wires to any sensor.
ECU bad....
keep in mind all things electronic can be good , bad ,intermittent or fails only hot or cold. that is there THING.


the IAT must be present if the ECU is IAT active (p./n of ECU tells that)
if  the ECU 92 no IAT active, then ,   IAT   it does not matter at  all,  (that 92 non IAT ECU DOES NOT SCAN THAT PIN SO CANNOT FAIL FOR IAT EVER)
if the ECU wants , IAT present (newer ECU) , and ITA  is missing or wires cut to it  the ECU WILL GO TO LIMPHOME MODE. (rich burn , no spark retard and lower power)

The 5vdc REF power is not optional ever,   when 5vdc fails 5vref., fails the TPS will fail first. for low voltage.
the dome fuse must be present or DTC errors will not be stored. (in DTC RAM memory)


maf RUNS OFF 12VDC BATTERY. NOT 5VDC LIKE OTHERS DO.


MAF pin Out list: (typ. 92-95’)  USA ! models.  The Suzuki and GM GEO books, name the pins backwards but the colors do not lie.


 1--- Blue/black ---- Main +12vdc  power   (IF THIS IS 0V, AS YOU SAID THE WIRE IS CUT.) THE MAF HAS NO POWER.

 2--- Gray/black --- MAF output signal  1 to 5v , proportional  to Air flow.   B8  (HOT IDLE 800RPM IS 1.7–2.0 volts.)  3 TO 4VOLTS WIDE OPEN THROTTLE FULL ENGINE LOAD (HILLS)

 3--- Black ---------- Ground. 0VOLTS. (put DMM meter black lead to BATTERY  NEG - LUG and RED test lead probe (back probing all 3 at idle) this pin is 0v. ground.


Blue/black  MUST BE 13.3 TO 15V RUNNING, THIS IS ALTERNATOR VOLTAGE SPEC. from main relay out;
see wiring here page 9 mAF,  colors matter,
pin 2 is MAF out, gray /black.

https://fixkick.com/power-elect/95%20ele...racker.pdf


good luck !