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I'm not to fluint with Toyotas so maybe someone else can answet this.
Are PCM/ECM the same part #'s for 91/92.. Does the MAP sensor read @ different parameters?
I don't know alot about toyotas, but I'm guessing it should have 3 wires going to the map. Ground, 5v reference wire, and signal wire. Maybe the 91 reads 2.5 volts @ 15 in hg while the 92 reads 3.2 @ 15. ETC, ETC.. See if they are the same part #. If they are then your problem is somewhere else.
I also am not to famalier with OBD I systems. Is DTC 31 for map sensor no reading, reading incorrect, etc...
If DTC 31 means it has NO signal from the map sensor then I would check voltage at the sensor with a multimeter. 3 wires. From bat ground one should read near 5v, one near 0v and the third should change as vacuum changes.
IF DTC 31 means incorrect signal from map sensor. I.E. The map should be reading a value of 2.5v and is only reading a 1.0v signal then I would guess that there is a vacuum leak.
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